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Numerical investigation of slurry shield cutterhead design for clogging mitigation using a coupled computational fluid dynamics–discrete element method approach 认领 引用
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作者 Yi YANG Jingwen QU +3 位作者 Xinggao LI Xuyang WANG Shuai ZHENG Changjin MA 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第1期202-220,共19页
Cutterhead clogging remains a significant challenge in slurry shield tunneling,particularly in clay-rich strata,leading to reduced efficiency and increased operational costs.This paper presents a comparative numerical... Cutterhead clogging remains a significant challenge in slurry shield tunneling,particularly in clay-rich strata,leading to reduced efficiency and increased operational costs.This paper presents a comparative numerical study of three common slurry shield cutterhead designs,atmospheric soft-soil cutterhead,atmospheric mix-ground cutterhead,and conventional cutterhead,using a coupled computational fluid dynamics–discrete element method(CFD–DEM)approach.The integrated CFD–DEM model allows for a detailed examination of slurry flow dynamics and granular material behavior within the cutterhead chamber.The analysis focuses on muck discharge efficiency,quantifying the volume of excavated material effectively removed,as well as particle accumulation patterns within the slurry chamber,identifying areas prone to clogging.Furthermore,the study examines cutterhead torque and thrust requirements for each design,providing a comprehensive performance assessment.Results demonstrate variations in performance across the three types,with the conventional cutterhead exhibiting the highest muck discharge rate under the tested conditions,while atmospheric-pressure designs show a higher risk of clogging due to increased particle accumulation in specific zones.This work contributes to a more informed selection and design methodology for slurry shield cutterheads,enabling engineers to optimize designs for specific soil conditions and minimize the risk of clogging in challenging geological conditions. 展开更多
关键词 slurry shield cutterhead design cutterhead clogging CFD-DEM modeling
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Tunnel face ground loss under cutterhead vibration in sandy ground with different degrees of saturation:Insights from DEM simulations 认领 引用
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作者 Junzuo He Shaoming Liao +3 位作者 Chao Liu Hai Liu Jie Cui Yingbin Liu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第12期7848-7863,共16页
Tunnel face ground loss(TFGL)emerging in shield tunnelling can trigger ground movement and impose threats to surrounding structures.However,the impact of cutterhead vibration on TFGL in sandy soils with varying degree... Tunnel face ground loss(TFGL)emerging in shield tunnelling can trigger ground movement and impose threats to surrounding structures.However,the impact of cutterhead vibration on TFGL in sandy soils with varying degrees of saturation has been largely unexplored.To fill this gap,an innovative numerical model based on computational fluid dynamics-discrete element method(CFD-DEM)and adhesive rolling resistance linear contact algorithm is established for the simulation of TFGL.Meanwhile,algorithms are proposed to account for the effects of cutterhead vibration and support pressure.Results from the validated model reveal that the TFGL can be exacerbated by seepage and opening enlargement,but mitigated by apparent cohesion.The cutterhead vibration can merely exacerbate the relatively small TFGL,which implies the unjamming effect of the particle at the opening.The balanced support pressure(BSP)required for TFGL prevention rises remarkably with the increases in opening ratio,vibration amplitude,and frequency.The maximum BSP in unsaturated sandy ground reaches up to 0.18γD,which is significantly less than that of 1.62γD observed in saturated sandy ground.The tangential and radial intervals with the largest TFGL are located within the ranges of 82.5°-97.5°,and 0.3D≤rloss≤0.45D,respectively.The increase in support pressure can alter the time-dependent development of TFGL from linear to stepwise,leading to convergence.The support pressure required for convergence is increased by cutterhead vibration and seepage,but decreased by apparent cohesion.Lastly,the prospects of the numerical study on TFGL under cutterhead vibration are also discussed. 展开更多
关键词 Tunnel face ground loss Seepage effect Apparent cohesion Sandy ground CFD-DEM coupling Cutterhead vibration
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A Closer Look at the Design of Cutterheads for Hard Rock Tunnel-Boring Machines 认领 引用 被引量：21
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作者 Jamal Rostami Soo-Ho Chang 《Engineering》 SCIE EI CAS 2017年第6期892-904,共13页
The success of a tunnel-boring machine （TBM） in a given project depends on the functionality of all components of the system, from the cutters to the backup system, and on the entire rolling stock. However, no part ... The success of a tunnel-boring machine （TBM） in a given project depends on the functionality of all components of the system, from the cutters to the backup system, and on the entire rolling stock. However, no part of the machine plays a more crucial role in the efficient operation of the machine than its cutterhead. The design of the cutterhead impacts the efficiency of cutting, the balance of the head, the life of the cutters, the maintenance of the main bearing/gearbox, and the effectiveness of the mucking along with its effects on the wear of the face and gage cutters/muck buckets. Overall, cutterhead design heavily impacts the rate of penetration （ROP）, rate of machine utilization （U）, and daffy advance rate （AR）. Although there has been some discussion in commonly available publications regarding disk cutters, cutting forces, and some design features of the head, there is limited literature on this subject because the design of cutter- heads is mainly handled by machine manufacturers. Most of the design process involves proprietary algorithms by the manufacturers, and despite recent attention on the subject, the design of rock TBMs has been somewhat of a mystery to most end-users. This paper is an attempt to demystify the basic concepts in design. Although it may not be sufficient for a full-fledged design by the readers, this paper allows engineers and contractors to understand the thought process in the design steps, what to Look for in a proper design, and the implications of the head design on machine operation and life cycle. 展开更多
关键词 TBM cutterhead design Cutterhead layout Disk cutters Cutting pattern TBM efficiency
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Real-time analysis and prediction of shield cutterhead torque using optimized gated recurrent unit neural network 认领 引用 被引量：20
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作者 Song-Shun Lin Shui-Long Shen Annan Zhou 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第4期1232-1240,共9页
An accurate prediction of earth pressure balance(EPB)shield moving performance is important to ensure the safety tunnel excavation.A hybrid model is developed based on the particle swarm optimization(PSO)and gated rec... An accurate prediction of earth pressure balance(EPB)shield moving performance is important to ensure the safety tunnel excavation.A hybrid model is developed based on the particle swarm optimization(PSO)and gated recurrent unit(GRU)neural network.PSO is utilized to assign the optimal hyperparameters of GRU neural network.There are mainly four steps:data collection and processing,hybrid model establishment,model performance evaluation and correlation analysis.The developed model provides an alternative to tackle with time-series data of tunnel project.Apart from that,a novel framework about model application is performed to provide guidelines in practice.A tunnel project is utilized to evaluate the performance of proposed hybrid model.Results indicate that geological and construction variables are significant to the model performance.Correlation analysis shows that construction variables(main thrust and foam liquid volume)display the highest correlation with the cutterhead torque(CHT).This work provides a feasible and applicable alternative way to estimate the performance of shield tunneling. 展开更多
关键词 Earth pressure balance(EPB)shield tunneling Cutterhead torque(CHT)prediction Particle swarm optimization(PSO) Gated recurrent unit(GRU)neural network
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Optimal design of structural parameters for shield cutterhead based on fuzzy mathematics and multi-objective genetic algorithm 认领 引用 被引量：16
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作者 夏毅敏 唐露 +2 位作者 暨智勇 程永亮 卞章括 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第3期937-945,共9页
In order to improve the strength and stiffness of shield cutterhead, the method of fuzzy mathematics theory in combination with the finite element analysis is adopted. An optimal design model of structural parameters ... In order to improve the strength and stiffness of shield cutterhead, the method of fuzzy mathematics theory in combination with the finite element analysis is adopted. An optimal design model of structural parameters for shield cutterhead is formulated,based on the complex engineering technical requirements. In the model, as the objective function of the model is a composite function of the strength and stiffness, the response surface method is applied to formulate the approximate function of objective function in order to reduce the solution scale of optimal problem. A multi-objective genetic algorithm is used to solve the cutterhead structure design problem and the change rule of the stress-strain with various structural parameters as well as their optimal values were researched under specific geological conditions. The results show that compared with original cutterhead structure scheme, the obtained optimal scheme of the cutterhead structure can greatly improve the strength and stiffness of the cutterhead, which can be seen from the reduction of its maximum equivalent stress by 21.2%, that of its maximum deformation by 0.75%, and that of its mass by 1.04%. 展开更多
关键词 shield tunneling machine cutterhead structural parameters fuzzy mathematics finite element optimization
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On the Loads for Strength Design of Cutterhead of Full Face Rock Tunnel Boring Machine 认领 引用 被引量：2
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作者 Meidong Han Zongxi Cai Chuanyong Qu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2019年第6期60-71,共12页
Cutterhead loads are the key mechanical parameters for the strength design of the full face hard rock tunnel boring machine(TBM).Due to the brittle rock-breaking mechanism,the excavation loads acting on cutters fluctu... Cutterhead loads are the key mechanical parameters for the strength design of the full face hard rock tunnel boring machine(TBM).Due to the brittle rock-breaking mechanism,the excavation loads acting on cutters fluctuate strongly and show some randomness.The conventional method that using combinations of some special static loads to perform the strength design of TBM cutterhead may lead to strength failure during working practice.In this paper,a three-dimensional finite element model for coupled Cutterhead–Rock is developed to determine the cutterhead loads.Then the distribution characteristics and the influence factors of cutterhead loads are analyzed based on the numerical results.It is found that,as time changes,the normal and tangential forces acting on cutters and the total torque acting on the cutterhead approximately distribute log normally,while the total thrusts acting on the cutterhead approximately show a normal distribution.Furthermore,the statistical average values of cutterhead loads are proportional to the uniaxial compressive strength(UCS)of cutting rocks.The values also change with the penetration and the diameter of cutterhead following a power function.Based on these findings,we propose a three-parameter model for the mean of cutterhead loads and a method of generating the random cutter forces.Then the strength properties of a typical cutterhead are analyzed in detail using loads generated by the new method.The optimized cutterhead has been successfully applied in engineering.The method in this paper may provide a useful reference for the strength design of TBM cutterhead. 展开更多
关键词 TBM cutterhead Strength design Numerical simulation Three-parameter model Random cutter forces
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A New System to Evaluate Comprehensive Performance of Hard-Rock Tunnel Boring Machine Cutterheads 认领 引用 被引量：2
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作者 Ye Zhu Wei Sun +1 位作者 Junzhou Huo Zhichao Meng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2019年第6期72-84,共13页
The accurate performance evaluation of a cutterhead is essential to improving cutterhead structure design and predicting project cost. Through extensive research, this paper evaluates the performance of a tunnel borin... The accurate performance evaluation of a cutterhead is essential to improving cutterhead structure design and predicting project cost. Through extensive research, this paper evaluates the performance of a tunnel boring machine(TBM) cutterhead for cutting ability and slagging ability. This paper propose cutting efficiency, stability, and continuity of slagging as the evaluation indexes of comprehensive cutterhead performance. On the basis of research of true TBM engineering applications, this paper proposes a calculation method for each index. A slagging efficiency index with a ratio of the maximum di erence between the slagging amount and average slagging is established. And a slagging stability index with a ratio of the maximum slagging fluctuation and average slagging is presented. Meanwhile, a cutting efficiency index by the weighed average value of multistage rock fragmentation of a cutter’s specific energy is established. The Robbins and China Railway Construction Corporation(CRCC) cutterheads are evaluated. The results show that under the same thrust and torque, the slagging stability of the CRCC scheme is worse, but the slagging continuity of the CRCC scheme is better. The cutting ability index shows that the CRCC cutterhead is more efficient. 展开更多
关键词 Evaluation of cutterhead Cutting ability Slagging ability Rock fragmentation load
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Numerical simulation of freezing effect and tool change of shield machine with a frozen cutterhead 认领 引用 被引量：7
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作者 DAI Wei XIA Yi-min +1 位作者 XU Hai-liang YANG Mei 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第4期1262-1272,共11页
A shield machine with freezing function is proposed in order to realize tool change operation at atmospheric pressure. Furthermore, the transformation project of freezing cutterhead and tool change maintenance method ... A shield machine with freezing function is proposed in order to realize tool change operation at atmospheric pressure. Furthermore, the transformation project of freezing cutterhead and tool change maintenance method are put forward. Taking the shield construction of Huanxi Power Tunnel as an example, a numerical analysis of the freezing cutter head of the project was carried out. The results show that when the brine temperature is-25 °C, after 30 d of freezing, the thickness of the frozen wall can reach 0.67 m and the average temperature drops to-9.9 °C. When the brine temperature is-30 °C, after 50 d of freezing, the thickness of the frozen wall can reach 1.01 m and the average temperature drops to-12.4 °C. If the thickness of the frozen wall is 0.5 m and the average temperature is-10 °C, as the design index of the frozen wall, the brine temperature should be lower than-28 °C to meet the excavation requirements in 30 d. Analyzing the frozen wall stress under 0.5 m thickness and-10 °C average temperature condition, the tensile safety factor and compressive safety factor are both greater than 2 at the most dangerous position, which can meet the tool change requirements for shield construction. 展开更多
关键词 shield machine construction frozen cutterhead tool change maintenance finite element simulation
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Evaluation Method for Tunneling Stability of TBM Cutterhead 认领 引用
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作者 Zhaohui Xu Ye Er-ken∙Zha Mu-ti +3 位作者 Lin Xue Fengtao Wang Jing Chen Junzhou Huo 《World Journal of Engineering and Technology》 2019年第2期1-9,共9页
In the process of tunneling of tunnel boring machine (TBM), different geological conditions often correspond to different working conditions, and the randomness of geological conditions also causes the order of occurr... In the process of tunneling of tunnel boring machine (TBM), different geological conditions often correspond to different working conditions, and the randomness of geological conditions also causes the order of occurrence of each working condition to be different. Under the conversion of different working conditions, this makes the vibration of different types of cutterheads different. How to choose the appropriate type of cutterhead according to different geological conditions is very important for saving engineering cost and increasing cutterhead life. In view of the above situation, this paper proposes a stability evaluation method during the TBM tunneling process to select the appropriate cutterhead type. Firstly, the corresponding relationship between geology and working conditions is established according to different geological conditions, and the input loads corresponding to geological conditions are obtained. Then, it is substituted into the dynamic model of the cutterhead system, the vibration response boundaries of each degree of freedom are obtained by solving. And the average value of the maximum boundary amplitude of each degree of freedom is taken to represent the extreme vibration of the cutterhead under the corresponding working conditions. Finally, by comparing the fluctuation of the ultimate vibration amplitude of each type of cutterhead in the process of working condition conversion, the results are as follows: when the transition between homogeneous strata and composite strata is normal and there is no large turning and deviation correction, the vibration response of the two-part cutterhead is the smallest, and the two-part cutterhead is the best choice. Otherwise, the five-part cutterhead is the best choice, while the stability of the integrated cutterhead is the worst. 展开更多
关键词 Cutterhead Working Condition Conversion Stability Type Selection of Cutterhead
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Evaluation of TBM Cutterhead’s Comprehensive Performance Under Complicated Conditions 认领 引用 被引量：1
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作者 Ye Zhu Xulong Wang Xiangyu Chen 《Journal of Beijing Institute of Technology》 EI CAS 2020年第3期326-338,共13页
A comprehensive performance evaluation method for the tunnel boring machine(TBM)cutterhead is proposed in this paper.The evaluation system is established on strength and vibration.Based on fracture mechanics theory,fa... A comprehensive performance evaluation method for the tunnel boring machine(TBM)cutterhead is proposed in this paper.The evaluation system is established on strength and vibration.Based on fracture mechanics theory,fatigue strength evaluation indices are determined under critical crack length.The concept of crack regions division is proposed to evaluate fatigue strength more accurately and specifically.In addition,the velocities in three directions of critical locations are obtained with dynamics equations.Then,the root-mean-square values of velocities are taken as the vibration severity indices.Taking the cutterhead of Jilin diversion engineering as an example,the evaluations of each index are completed;then,the vibration of the TBM cutterhead is measured and compared with the theoretical calculation results.There are similar change laws between the theoretical calculation results and the testing results of the cutterhead acceleration,which proves that the method of calculation of the vibration index is effective,the reliability of the cutter saddle welding should be paid attention to when the TBM is working,and the condition of vibration severity of the TBM cutterhead meets the requirements but needs to be improved. 展开更多
关键词 cutterhead evaluation fatigue strength vibration severity
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A Prediction Method for TBM Cutterhead Dynamic Tunneling Performance under Typical Composite Geological Conditions 认领 引用 被引量：1
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作者 Jingxiu Ling Xiaojing Yang Zhihong Wu 《Mechanical Engineering Science》 2019年第1期32-40,共9页
The cutterhead system is a core component of TBM equipment,which works in the extremely severe environment,and the strong impact loads result in severe vibration,crack,damage failure and other engineering failures.Acc... The cutterhead system is a core component of TBM equipment,which works in the extremely severe environment,and the strong impact loads result in severe vibration,crack,damage failure and other engineering failures.Accordingly,the key for cutterhead system structure design and parameter matching is to evaluate and predict cutterhead tunneling per-formance reasonably.In this paper,a prediction method for TBM cutterhead dynamic tunneling performance is pro-posed under the typical composite geological conditions,based on the CSM model of multi-cutters and cutter loads field test data.Then an actual TBM cutterhead of a water conservancy project is taken as an example,a spatial three-dimensional separation zone model for cutterhead tunneling is established under the typical geological condition,and the parameters influence rules of cutterhead tunneling performance are analyzed.The results show that,the cutter-head loads and specific energy change rules with different parameters are basically similar.Moreover,under the condi-tion of penetration p=10mm,the cutterhead bending moment coefficient of variation magnitude exceeds 20%,which is the maximum,and the normal cutter spacing optimal value is 95mm.Also,when the normal cutter spacing is kept constant in 85mm,the penetration has a greater influence on the torque and specific energy coefficient of variations,which is increased from 2mm to 10mm,and the two indexes decrease by about 73%.It is indicated that proper increase of pene-tration is beneficial to reduce the vibration fluctuation degree of torque and specific energy.The proposed method of TBM cutterhead dynamic tunneling performance and the analysis results can provide theoretical basis and design refer-ence for TBM cutterhead layout and tunneling parameters matching. 展开更多
关键词 TBM cutterhead,spatial geological model tunneling performance parameter influence
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Model test on cutterhead-soil interaction during shield tunneling and its theoretical model 认领 引用 被引量：2
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作者 Xiang Shen Dajun Yuan +4 位作者 Dalong Jin Xiangsheng Chen Weiping Luo Yuansheng Peng Kai Duan 《Underground Space》 SCIE EI CSCD 2025年第1期46-68,共23页
This study aims to develop a rational theoretical model for cutterhead-soil interaction.The cutterhead-soil interaction mechanism is divided into two components:the cutting action of the cutter on the soil and the ext... This study aims to develop a rational theoretical model for cutterhead-soil interaction.The cutterhead-soil interaction mechanism is divided into two components:the cutting action of the cutter on the soil and the extrusion of the cutterhead on the soil.By enhancing the Mckyes–Ali model,we analyze and deduce the force state of the cutter during shield tunneling,obtaining a calculation method for deter-mining the force on the cutter.Additionally,we conduct an in-depth analysis of the extrusion effect of the cutterhead on the soil during shield tunneling,utilizing the fundamental solution of the Kelvin problem.Based on these theoretical calculations,we validate the tun-neling thrust and cutterhead torque of the shield using our self-developed multi-functional large-scale shield tunneling test platform.The test results demonstrate that the tunneling thrust and cutterhead torque derived from the established cutterhead-soil interaction model in this paper are relatively close to the experimental monitoring values.This provides a theoretical foundation for establishing reasonable shield tunneling loads. 展开更多
关键词 Shield machine Cutterhead Tunneling load Model test Interaction
A new calculation model of cutterhead torque and investigation of its influencing factors 认领 引用 被引量：10
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作者 WANG LinTao GONG GuoFang +1 位作者 SHI Hu YANG HuaYong 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第6期1581-1588,共8页
Cutterhead torque is a crucial parameter for the design and operation of earth pressure balance （EPB） shield tunneling machine. However, the traditional calculation models of cutterhead torque are too rough or exist... Cutterhead torque is a crucial parameter for the design and operation of earth pressure balance （EPB） shield tunneling machine. However, the traditional calculation models of cutterhead torque are too rough or exist gross errors under variable geological conditions. In order to improve the precision of the calculation model of cutterhead torque, dynamic operation parameters are considered and a new model is proposed. Experiment is carried out on a ~1.8 m shield machine test rig and the calculating re- sult with the new model is compared with the experimental data to verify the validity of the new model. The relative error of the new model is as low as 4% at smooth stage and is reduced to 5% at the end of trembling stage. Based on the results of the new model and the test data obtained from the 001.8 m test rig and the construction site, the inner relationships between several operation parameters and cutterhead torque are investigated and some quantitative conclusions are obtained. 展开更多
关键词 EPB shield tunneling machine cutterhead torque earth pressure cutterhead aperture ratio penetration per revolution
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Torque prediction theory and its application for full-face rock tunnel boring machine 认领 引用
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作者 Zhaohuang Zhang Muhammad Talib +3 位作者 Yinfeng Zhang Kefeng Cheng Bushra Tabassum Xinyu Ji 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期191-198,共8页
A full-face rock tunnel boring machine(TBM)has two main parameters:cutterhead thrust and cutterhead torque.Cutterhead thrust can be predicted numerically using different methods,such as the rated thrust of the disc cu... A full-face rock tunnel boring machine(TBM)has two main parameters:cutterhead thrust and cutterhead torque.Cutterhead thrust can be predicted numerically using different methods,such as the rated thrust of the disc cutter,the indentation test of the disc cutter,a linear breaking experiment,or applying statistical models based on field data.However,cutterhead torque prediction still lacks the necessary and sufficient theoretical analysis and corresponding research.Consequently,we studied the rock-breaking characteristics of the disc cutter on the cutterhead and found a difference between the lateral friction resistance and the inner and outer rock breaking.We then proposed the cutterhead torque composition of the full-face rock tunnel boring machine,shoveling and transporting ballast torque,rolling resistance torque,lateral friction resistance torque,and disc cutter lateral imbalance torque,and established the corresponding theory.Through practical engineering ver-ification,we found that the relative error between the cutterhead torque value calculated by the theory and the actual value was only 0.51%.If the lateral friction resistance moment of the disc cutter rock breaking and the lateral imbalance moment of the disc cutter are not considered,the relative error between the calculated value of cutterhead torque and the actual value is 7.48%.Therefore,the accuracy of the established cutterhead torque theory is 6.97%higher than that of the disc cutter linear rolling crushing rock test theory.The research results provide an important reference for determining the cutterhead torque of a full-face rock tunnel boring machine. 展开更多
关键词 Full-face rock tunnel boring machine Cutterhead torque Torque prediction Disc cutter
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A novel LSTM-autoencoder and enhanced transformer-based detection method for shield machine cutterhead clogging 认领 引用 被引量：20
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作者 QIN ChengJin WU RuiHong +2 位作者 HUANG GuoQiang TAO JianFeng LIU ChengLiang 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2023年第2期512-527,共16页
Shield tunneling machines are paramount underground engineering equipment and play a key role in tunnel construction.During the shield construction process,the“mud cake”formed by the difficult-to-remove clay attache... Shield tunneling machines are paramount underground engineering equipment and play a key role in tunnel construction.During the shield construction process,the“mud cake”formed by the difficult-to-remove clay attached to the cutterhead severely affects the shield construction efficiency and is harmful to the healthy operation of a shield tunneling machine.In this study,we propose an enhanced transformer-based detection model for detecting the cutterhead clogging status of shield tunneling machines.First,the working state data of shield machines are selected from historical excavation data,and a long short-term memory-autoencoder neural network module is constructed to remove outliers.Next,variational mode decomposition and wavelet transform are employed to denoise the data.After the preprocessing,nonoverlapping rectangular windows are used to intercept the working state data to obtain the time slices used for analysis,and several time-domain features of these periods are extracted.Owing to the data imbalance in the original dataset,the k-means-synthetic minority oversampling technique algorithm is adopted to oversample the extracted time-domain features of the clogging data in the training set to balance the dataset and improve the model performance.Finally,an enhanced transformer-based neural network is constructed to extract essential implicit features and detect cutterhead clogging status.Data collected from actual tunnel construction projects are used to verify the proposed model.The results show that the proposed model achieves accurate detection of shield machine cutterhead clogging status,with 98.85%accuracy and a 0.9786 F1 score.Moreover,the proposed model significantly outperforms the comparison models. 展开更多
关键词 shield tunneling machine cutterhead clogging fault diagnosis autoencoder multihead self-attention mechanism imbalanced data
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Influence of cutterhead opening ratio on soil arching effect and face stability during tunnelling through non-uniform soils 认领 引用 被引量：5
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作者 Xue-Jian Chen Pei-Pei Fang +3 位作者 Qiu-Nan Chen Jun Hu Kai Yao Yong Liu 《Underground Space》 SCIE EI CSCD 2024年第4期45-59,共15页
Tunnelling has increasingly become an essential tool in the exploration of underground space.A typical construction problem is the face instability during tunnelling,posing a great threat to associated infrastructures... Tunnelling has increasingly become an essential tool in the exploration of underground space.A typical construction problem is the face instability during tunnelling,posing a great threat to associated infrastructures.Tunnel face instability often occurs with the soil arching collapse.This study investigates the combined effect of cutterhead opening ratio and soil non-uniformity on soil arching effect and face stability,via conducting random finite-element analysis coupled with Monte–Carlo simulations.The results underscore that the face stability is strongly associated with the evolution of stress arch.The obtained stability factors in the uniform soils can serve as a reference for the design of support pressure in practical tunnelling engineering.In addition,non-uniform soils exhibit a lower stability factor than uniform soils,which implies that the latter likely yields an underestimated probability of face failure.The tunnel face is found to have a probability of failure more than 50%if the spatial non-uniformity of soil is ignored.In the end,a practical framework is established to determine factor of safety(FOS)corresponding to different levels of probability of face failure considering various opening ratios in non-uniform soils.The required FOS is 1.70 to limit the probability of face instability no more than 0.1%.Our findings can facilitate the prediction of probability of instability in the conventionally deterministic design of face pressure. 展开更多
关键词 Tunnel Face stability Soil arching effect Cutterhead opening ratio Non-uniform soil Random field
Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages 认领 引用 被引量：2
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作者 Yinzun YANG Dajun YUAN Dalong JIN 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2023年第4期522-532,共11页
Owing to long-distance advancement or obstacles,shield tunneling machines are typically shut down for maintenance.Engineering safety during maintenance outages is determined by the stability of the tunnel face.Pressur... Owing to long-distance advancement or obstacles,shield tunneling machines are typically shut down for maintenance.Engineering safety during maintenance outages is determined by the stability of the tunnel face.Pressure maintenance openings are typically used under complicated hydrogeological conditions.The tunnel face is supported by a medium at the bottom of the excavation chamber and compressed air at the top.Owing to the high risk of face failure,the necessity of support pressure when cutterhead support is implemented and a method for determining the value of compressed air pressure using different support ratios must to be determined.In this study,a non-fully chamber supported rotational failure model considering cutterhead support is developed based on the upper-bound theorem of limit analysis.Numerical simulation is conducted to verify the accuracy of the proposed model.The results indicate that appropriately increasing the specific gravity of the supporting medium can reduce the risk of collapse.The required compressed air pressure increases significantly as the support ratio decreases.Disregarding the supporting effect of the cutterhead will result in a tunnel face with underestimated stability.To satisfy the requirement of chamber openings at atmospheric pressure,the stratum reinforcement strength and range at the shield end are provided based on different cutterhead aperture ratios. 展开更多
关键词 tunnel face stability cutterhead configuration aperture ratio pressure gradient support ratio
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Numerical and analytical studies on the coupling effects of unloading and cutterhead vibration on tunnel face in dry sandy ground 认领 引用 被引量：1
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作者 Junzuo He Shaoming Liao +2 位作者 Mengbo Liu Motoi Iwanami Yanqing Men 《Underground Space》 SCIE EI CSCD 2024年第5期256-272,共17页
When tunnelling in difficult ground conditions,shield machine would inevitably produce significant ground loss and vibration,which may disturb the ground ahead of the tunnel face.In this paper,discrete element models ... When tunnelling in difficult ground conditions,shield machine would inevitably produce significant ground loss and vibration,which may disturb the ground ahead of the tunnel face.In this paper,discrete element models calibrated by model tests were established to investigate the response of tunnel face under the coupling effects of unloading and cutterhead vibrations.The results show that the friction angle reduction under cyclic loading and vibration attenuation in the sandy ground are significant and can be estimated by the fitted exponential functions.Under cutterhead vibration,the tunnel face stability is undermined and the limit support pressure(LSP)increases to 1.4 times as that in the static case with the growth of frequency and amplitude.Meanwhile,the loosening zone becomes wider and the arching effect is weakened with the reduction of peak horizontal stress and the increase of vertical stress above the tunnel.Based on the numerical results,a pseudo-static method was introduced into the limit equilibrium analysis of the wedge-prism model for calculating the LSP under vibration.With an error rate less than 5.2%,the proposed analytical method is well validated.Further analytical calculation reveals that the LSP would increase with the growth of vibration amplitude,vibration frequency and covered depth but decrease with the increase of friction angle.This study can not only lay a solid foundation for the further investigation of ground loss,ground water and soft-hard heterogeneous ground under cutterhead vibration,but also provide meaningful references for the control of environmental disturbance in practice. 展开更多
关键词 Cutterhead vibration Tunnel face stability Discrete element method Pseudo-static method
TBM刀盘卡机风险分级预测方法构建与验证 认领 引用
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作者 陈天楠 刘立鹏 +2 位作者 汪小刚 刘和艺 李佩茹 《水利学报》 EI CSCD 北大核心 2026年第4期601-611,共11页
针对TBM穿越断层破碎带时刀盘卡机灾害预测难题,收集整理了TBM工程数据库,构建了关联掌子面最大变形与TBM最大驱动扭矩的卡机风险预测图,建立了考虑岩体强度与地应力比值的掌子面变形量预测模型,结合预测模型与预测图,形成了一套TBM刀... 针对TBM穿越断层破碎带时刀盘卡机灾害预测难题,收集整理了TBM工程数据库,构建了关联掌子面最大变形与TBM最大驱动扭矩的卡机风险预测图,建立了考虑岩体强度与地应力比值的掌子面变形量预测模型,结合预测模型与预测图,形成了一套TBM刀盘卡机风险分级预测方法,并依托国内3个TBM工程对判别方法可靠性进行了验证。结果表明:针对刀盘卡机风险,可划分为极高风险、较高风险、中等风险、较低风险和极低风险五级等级;掌子面变形量预测模型中强度应力比与掌子面变形率呈负指数函数关系,基于模型可获取隧洞掌子面变形量;基于所提出的刀盘卡机风险分级预测方法的预测结果与工程实际相比总体准确率可达96%,可用于隧洞工程TBM刀盘卡机风险的判别。 展开更多
关键词 隧洞工程 刀盘卡机 风险预测 数值模拟
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基于分散剂处理的高黏性地层盾构泥饼双路径防控方法 认领 引用
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作者 任国平 张箭 +3 位作者 丰土根 余雪娟 张文超 方园 《隧道建设（中英文）》 EI CSCD 北大核心 2026年第3期562-575,共14页
为解决泥水盾构在高黏性地层施工中泥饼防控方案存在的盲目性与低效性难题,特别是现有研究普遍未区分预防泥饼形成与处理已形成泥饼2种不同应用场景的机制差异,提出一种基于分散剂的预防-处理双路径协同防控方法。选取9种盾构常用的有机... 为解决泥水盾构在高黏性地层施工中泥饼防控方案存在的盲目性与低效性难题,特别是现有研究普遍未区分预防泥饼形成与处理已形成泥饼2种不同应用场景的机制差异,提出一种基于分散剂的预防-处理双路径协同防控方法。选取9种盾构常用的有机类(如月桂醇聚醚硫酸酯钠、木质素磺酸钠等)和无机类(如焦磷酸钠、六偏磷酸钠等)分散剂,通过预防-处理双路径试验系统评估其效能:预防路径采用搅拌黏附试验模拟刀盘动态剪切,以黏土黏附质量量化分散剂抑制效果;处理路径结合泥饼崩解试验与黏附力测试,分析残余黏附力削弱能力。系统揭示分散剂类型与其最佳质量分数在2类场景下的差异化影响规律。结果表明:1)预防阶段,阴离子表面活性剂月桂醇聚醚硫酸酯钠(SLES,质量分数1.0%)与高分子分散剂聚羧酸盐(PCAC,质量分数1.0%)可显著降低黏附率至10.8%~15.0%,且质量分数超过1.0%~2.0%后普遍存在效能阈值;2)处理阶段,PCAC与SLES复配(1∶1)实现协同增效,泥饼崩解率提升至69.14%(较单一组分提高22.52%~26.03%),残余黏附力降低82.33%,并明确了不同复配比例下的协同效应与成本效益。机制分析表明,分散剂通过增强静电斥力与空间位阻效应显著促进黏土分散。 展开更多
关键词 泥水盾构 刀盘泥饼 分散剂 泥饼预防 泥饼处理 黏附力 Zeta电位
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