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Failure mechanism and damage constitutive model of rectangular tunnels under water-rich condition 认领 引用
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作者 Banquan Zeng Jianhang Chen +5 位作者 Wuyan Xu Xiaoyong An Shiji Wang Songsong Hu Kun Wang Yu Chen 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第12期2245-2264,共20页
To investigate groundwater influence on stability and rockburst mechanism of deep hard-rock rectangular tunnels,water-immersed treatment and uniaxial compressive acoustic emission(AE)experiments were conducted on rect... To investigate groundwater influence on stability and rockburst mechanism of deep hard-rock rectangular tunnels,water-immersed treatment and uniaxial compressive acoustic emission(AE)experiments were conducted on rectangular tunnel specimens.Energy dissipation characteristics,AE evolution characteristics and damage evolution characteristics of rectangular tunnels were analysed under waterimmersed condition.Under water-immersed condition,tunnel specimens were quite sensitive to water.Average peak stress and average peak strain energy exhibited negative exponential decay with waterimmersed time.Among them,after 12 d of water immersion,average peak stress of specimens decreased by 28%.Average total strain energy decreased by 70%.Average elastic strain energy decreased by 71%and average dissipated strain energy decreased by 68%.After 62 d of water immersion,average peak stress of specimens decreased by 34%.Average total strain energy decreased by 78%.Average elastic strain energy decreased by 79%and average dissipated strain energy decreased by 75%.Water weakened bonding among mineral particles.Moreover,it undermined load-bearing capacity and diminished energystorage properties.Under high stress,massive releasable elastic strain energy stored in natural specimens within pre-peak stage may abruptly release after peak stress.This caused rapid crack development and connection in specimens.During accumulation and release of elastic strain energy,initial failure typically occurred at sidewalls.This failure location was not affected by water.Compared with natural specimens,Specimens immersed in water for 62 d had the lowest peak values of cumulative amplitude,cumulative AE energy and cumulative AE count.After 62 d of water immersion,peak values of cumulative amplitude,cumulative AE energy and cumulative AE count of specimens decreased by 84%,97%and 99%.Compared with AE damage model,fitting degree of energy damage model was higher.For natural specimens,fitting degree of energy damage model was 0.96.For specimens immersed in water for 12 d,fitting degree of energy damage model was 0.96.For specimens immersed in water for 62 d,fitting degree of energy damage model was 0.72.Therefore,an energy damage model had more remarkable applicability and reliability.By establishing dynamic mapping relationship between energy and damage in the model,accuracy of rockburst early warning has been significantly improved.This provided scientific basis for support structure design of rectangular tunnels and regulation of high strain energy. 展开更多
关键词 Rectangular tunnels Energy dissipation characteristics Evolution characteristics of AE signals Damage evolution characteristics Energy damage model
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Influence of the liquefied soil layer distribution on the seismic response of rectangular tunnel 认领 引用 被引量：6
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作者 Liu Chunxiao Tao Lianjin +4 位作者 Bian Jin Feng Jinhua Zhang Yu Dai Xitong Wang Zhaoqing 《Journal of Southeast University(English Edition)》 EI CAS 2018年第2期259-268,共10页
In order to obtain the seismic responses of the soil-rectangular tunnel structure,based on the PL-Finn constitutive model,four different conditions,namely,the liquefied soil around the rectangular tunnel,the liquefied... In order to obtain the seismic responses of the soil-rectangular tunnel structure,based on the PL-Finn constitutive model,four different conditions,namely,the liquefied soil around the rectangular tunnel,the liquefied soil below the rectangular tunnel,the liquefied soil on either side of the tunnel and the structure on non-liquefied soil,are compared.In accordance to the time at which a large deformation occurs,the possibility of destruction from hard to easy follows a descending order:the liquefied soil all around the structure,the liquefied soil on the bottom of the structure,and the liquefied soil on the two sides of the structure.The area of large deformation is mostly beneath the two arch angles of the tunnel floor.The soil on the two sides,especially close to the structure,is the hardest to liquefy and deform.The large deformation of soil caused by the liquefaction appears after the peak seismic value occurs.The higher the input seismic value is,the easier a large deformation can take place.With the same input of peak ground motion,the total displacement vector of the structure and differential displacement of the side-wall are in accordance with an order from large to small in the three situations:when the saturated sand is on two sides,all around the structure,and on the bottom of the structure. 展开更多
关键词 liquefaction seismic response rectangular tunnel PL-Finn constitutive model numerical simulation
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Rectangular tunnel heading stability in three dimensions and its predictive machine learning models 认领 引用
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作者 Jim Shiau Suraparb Keawsawasvong +3 位作者 Van Qui Lai Thanachon Promwichai Viroon Kamchoom Rungkhun Banyong 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第11期4683-4696,共14页
Tunnel heading stability in two dimensions(2D)has been extensively investigated by numerous scholars in the past decade.One significant limitation of 2D analysis is the absence of actual tunnel geometry modeling with ... Tunnel heading stability in two dimensions(2D)has been extensively investigated by numerous scholars in the past decade.One significant limitation of 2D analysis is the absence of actual tunnel geometry modeling with a considerable degree of idealization.Nevertheless,it is possible to study the stability of tunnels in three dimensions(3D)with a rectangular shape using finite element limit analysis(FELA)and a nonlinear programming technique.This paper employs 3D FELA to generate rigorous solutions for stability numbers,failure mechanisms,and safety factors for rectangular-shaped tunnels.To further explore the usefulness of the produced results,multivariate adaptive regression spline(MARS)is used for machine learning of big dataset and development of design equations for practical design applications.The study should be of great benefit to tunnel design practices using the developed equations provided in the paper. 展开更多
关键词 Wide rectangular tunnel Finite element limit analysis(FELA) Multivariate adaptive regression spline(MARS) Three dimensions(3D) Stability analysis
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Power allocation and mode selection methods for cooperative communication in the rectangular tunnel 认领 引用 被引量：2
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作者 Zhai Wenyan Sun Yanjing +1 位作者 Xu Zhao Li Song 《International Journal of Mining Science and Technology》 EI CAS CSCD 2015年第2期253-260,共8页
For the multipath fading on electromagnetic waves of wireless communication in the confined areas,the rectangular tunnel cooperative communication system was established based on the multimode channel model and the ch... For the multipath fading on electromagnetic waves of wireless communication in the confined areas,the rectangular tunnel cooperative communication system was established based on the multimode channel model and the channel capacity formula derivation was obtained.On the optimal criterion of the channel capacity,the power allocation methods of both amplifying and forwarding(AF)and decoding and forwarding(DF)cooperative communication systems were proposed in the limitation of the total power to maximize the channel capacity.The mode selection methods of single input single output(SISO)and single input multiple output(SIMO)models in the rectangular tunnel,through which the higher channel capacity can be obtained,were put forward as well.The theoretical analysis and simulation comparison show that,channel capacity of the wireless communication system in the rectangular tunnel can be effectively enhanced through the cooperative technology;channel capacity of the rectangular tunnel under complicated conditions is maximized through the proposed power allocation methods,and the optimal cooperative mode of the channel capacity can be chosen according to the cooperative mode selection methods given in the paper. 展开更多
关键词 Rectangular tunnel Multimode channel model Channel capacity Cooperative communication Power allocation Mode selection
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Analytical solutions of vertical load on deep rectangular jacked pipe considering tunnelling-induced ground loss 认领 引用 被引量：4
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作者 LI Jian-ye FANG Qian +4 位作者 LIU Xiang WANG Gan HUANG Jun DU Jian-ming ZHANG Zi-yi 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第5期1855-1872,共18页
Determining earth pressure on jacked pipes is essential for ensuring lining safety and calculating jacking force,especially for deep-buried pipes.To better reflect the soil arching effect resulting from the excavation... Determining earth pressure on jacked pipes is essential for ensuring lining safety and calculating jacking force,especially for deep-buried pipes.To better reflect the soil arching effect resulting from the excavation of rectangular jacked pipes and the distribution of the earth pressure on jacked pipes,we present an analytical solution for predicting the vertical earth pressure on deep-buried rectangular pipe jacking tunnels,incorporating the tunnelling-induced ground loss distribution.Our proposed analytical model consists of the upper multi-layer parabolic soil arch and the lower friction arch.The key parameters(i.e.,width and height of friction arch B and height of parabolic soil arch H 1)are determined according to the existing research,and an analytical solution for K l is derived based on the distribution characteristics of the principal stress rotation angle.With consideration for the transition effect of the mechanical characteristics of the parabolic arch zone,an analytical solution for soil load transfer is derived.The prediction results of our analytical solution are compared with tests and simulation results to validate the effectiveness of the proposed analytical solution.Finally,the effects of different parameters on the soil pressure are discussed. 展开更多
关键词 rectangular pipe jacking tunnel vertical load multi-layer parabolic soil arch model soil arching
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Prototype Loading Tests on Full-Ring Segmental Lining of Rectangular Shield Tunnel 认领 引用 被引量：1
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作者 ZHU Yeting ZHANG Zixin +1 位作者 HUANG Xin ZHANG Guanjun 《Journal of Shanghai Jiaotong university(Science)》 EI 2018年第6期746-757,共12页
A series of full-scale loading tests are performed for a prospective subway tunnel with a rectangular shape including two reliability tests: one stagger-jointed three-ring reliability test, and one ultimate failure te... A series of full-scale loading tests are performed for a prospective subway tunnel with a rectangular shape including two reliability tests: one stagger-jointed three-ring reliability test, and one ultimate failure test on a single ring. Comprehensive measuring programs are designed to record the deformation of both lining structure and joints and the stresses of concrete, bolts and reinforcements. Experimental results show that in both the single-ring and three-ring loading cases, the long sides of tunnel cross section bend inwards while the short sides of tunnel cross section bend outwards. The inner part of joints opens while the outer part of joints closes at places experiencing positive moment and vice versa. Joint's rotational stiffness varies at different locations. Concrete cracking and crushing are the chief damage modes, and they are closely related to the distribution of bending moment. Stagger-jointed fabrication significantly increases the overall rigidity of lining system, which thereby greatly reduces the deformation of both concrete lining and joints in comparison with the single-ring case. It is shown that the routinely-used uniform rigidity model is conservative and the preliminary design can be optimized by applying an effective rigidity ratio(ERR) of 0.5. 展开更多
关键词 segmental lining prototype loading test rectangular shield tunnel effective rigidity ratio(ERR) ultimate failure
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Reliability analysis of supporting pressure in tunnels based on three-dimensional failure mechanism 认领 引用 被引量：7
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作者 罗卫华 李闻韬 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第5期1243-1252,共10页
Based on nonlinear failure criterion,a three-dimensional failure mechanism of the possible collapse of deep tunnel is presented with limit analysis theory.Support pressure is taken into consideration in the virtual wo... Based on nonlinear failure criterion,a three-dimensional failure mechanism of the possible collapse of deep tunnel is presented with limit analysis theory.Support pressure is taken into consideration in the virtual work equation performed under the upper bound theorem.It is necessary to point out that the properties of surrounding rock mass plays a vital role in the shape of collapsing rock mass.The first order reliability method and Monte Carlo simulation method are then employed to analyze the stability of presented mechanism.Different rock parameters are considered random variables to value the corresponding reliability index with an increasing applied support pressure.The reliability indexes calculated by two methods are in good agreement.Sensitivity analysis was performed and the influence of coefficient variation of rock parameters was discussed.It is shown that the tensile strength plays a much more important role in reliability index than dimensionless parameter,and that small changes occurring in the coefficient of variation would make great influence of reliability index.Thus,significant attention should be paid to the properties of surrounding rock mass and the applied support pressure to maintain the stability of tunnel can be determined for a given reliability index. 展开更多
关键词 rectangular tunnel limit analysis failure mechanism reliability analysis
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矩形顶管锁紧型接头抗震性能试验研究 认领 引用 被引量：1
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作者 张朝 李鑫 +3 位作者 高柯 公衍德 魏嘉琛 许有俊 《铁道科学与工程学报》 EI CAS CSCD 北大核心 2026年第3期1298-1309,共12页
由螺栓和F型承插接头构成的锁紧型接头在矩形顶管隧道工程中刚刚开始应用,目前对此类接头的抗震性能和地震破坏特征认识尚不清楚。为此,以包头市八一公园地下过街通道工程为研究背景,开展矩形顶管锁紧型接头模型拟静力试验,揭示螺栓连... 由螺栓和F型承插接头构成的锁紧型接头在矩形顶管隧道工程中刚刚开始应用,目前对此类接头的抗震性能和地震破坏特征认识尚不清楚。为此,以包头市八一公园地下过街通道工程为研究背景,开展矩形顶管锁紧型接头模型拟静力试验,揭示螺栓连接下矩形顶管锁紧型接头的地震破坏特征、破坏演化过程,探究其位移延性、耗能能力、刚度退化等抗震性能。研究结果表明:在低周反复荷载作用下,矩形顶管F型承插接头的破坏形式主要是插口脱出的变形破坏,而锁紧型接头的破坏形式为连接件被剪断的塑性破坏;锁紧型接头的破坏演化过程可归纳为弹性滑移(Ⅰ)、局部开裂延伸(Ⅱ)、结构失效(Ⅲ)3个阶段,呈现出典型的渐进式破坏特征,其腋角部位混凝土应变远大于其他位置,是核心受力部位,破坏最为严重。矩形顶管锁紧型接头滞回曲线的形状不饱满,呈现典型的反“S”型,接头延性及吸收地震能量的能力较差,但优于F型承插接头。F型承插接头的初始抗弯刚度远小于锁紧型接头,仅为锁紧型接头的3%。锁紧型接头在加载过程中刚度逐渐降低,其刚度退化呈非线性特征,Ⅰ阶段及Ⅱ阶段初期刚度退化明显,Ⅱ阶段腋角开裂后刚度退化逐渐变缓,Ⅱ阶段末刚度退化速率略有回升。至锁紧型接头破坏点时,正向、反向环线刚度分别降至初始刚度的32.1%和25.8%,接头仍具有一定剩余承载能力。研究结果可为优化矩形顶管隧道抗震韧性设计、保障矩形顶管隧道安全运营提供参考。 展开更多
关键词 隧道工程 矩形顶管 拟静力试验 抗震性能 破坏特征
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全断面矩形掘进机刀盘设计及其稳定截割岩样截割特性试验研究 认领 引用
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作者 李强 刘送永 王焱 《中国机械工程》 EI CAS CSCD 北大核心 2026年第2期487-497,共11页
针对现有煤矿巷道全断面矩形掘进机刀盘形式复杂、全断面一次掘进成形困难等问题,提出了一种基于勒洛三角形运动原理实现矩形截割的方法,设计了一种基于所提方法的偏心轴行星齿轮驱动勒洛三角形单刀盘,进行了运动轨迹仿真,搭建了全断面... 针对现有煤矿巷道全断面矩形掘进机刀盘形式复杂、全断面一次掘进成形困难等问题,提出了一种基于勒洛三角形运动原理实现矩形截割的方法,设计了一种基于所提方法的偏心轴行星齿轮驱动勒洛三角形单刀盘,进行了运动轨迹仿真,搭建了全断面矩形刀盘截割试验台,进行了稳定截割状态下的多组试验。试验结果表明:中心鱼尾刀能增加截割过程的稳定性,较大程度地减小了X、Y、Z方向的振动,减小幅度最小达42.107%,最大达51.753%;进行了11组不同截割参数下的稳定截割岩样试验,得到了扭矩、油压与截割参数的变化关系,提出了设备经济截割参数区域的概念,确定了在试验岩样下所设计的刀盘经济截割参数区域为:转速n(N-p)min=[6.6,9.8]r/min,掘进速度v(N-p)min=[14.25,18.3]mm/min;对截割后的岩样断面轮廓进行三维扫描、重构和比对,得到理论断面、仿真断面、试验断面与标准正方形之间的图形差异率依次为3.18%、5.09%、6.64%,验证了该刀盘实现矩形截割的可行性。 展开更多
关键词 全断面 矩形 掘进机 截割特性 图形差异率 经济截割区域
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考虑土拱效应的双线矩形隧道地表沉降预测多拱解析模型 认领 引用
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作者 胡达 谭泽 +2 位作者 黎永索 翁晓轩 申朝龙 《岩土工程学报》 EI CAS CSCD 北大核心 2026年第7期1444-1453,共10页
双线矩形隧道施工中,土拱效应对隧道间相互作用及地层扰动机制的影响复杂且机理不明,制约了地表沉降预测的精度。为此,提出一种考虑土拱效应的双线矩形隧道地表沉降解析预测新方法。该方法首先构建了包含弹性拱与隧道间摩擦拱的“多拱... 双线矩形隧道施工中,土拱效应对隧道间相互作用及地层扰动机制的影响复杂且机理不明,制约了地表沉降预测的精度。为此,提出一种考虑土拱效应的双线矩形隧道地表沉降解析预测新方法。该方法首先构建了包含弹性拱与隧道间摩擦拱的“多拱模型”,并推导了其应力演化方程;其次,基于复变函数改进Loganathan公式,建立了适用于双线矩形隧道工况的地表沉降预测模型。最后,通过建立不同深距比(H/S)的有限元模型,以及宁波#3线案例对所提方法的预测结果与Peck公式进行了对比验证。研究发现,地表沉降槽形态与隧道埋深与净间距之比(H/S,S为隧道净距)密切相关:当H/S≤1/3或H/S>2时呈“V”形;当1/3<H/S≤1时呈“W”形;当1<H/S≤2时呈“U”形。验证结果表明,与Peck公式相比,所提方法能更准确地预测不同工况下的地表沉降,与实际监测数据大致吻合,尤其能反映土拱效应的影响,可为城市双线矩形隧道设计与施工提供理论参考。 展开更多
关键词 双线矩形隧道 土拱效应 地表沉降 改进Loganathan方法 复变函数理论
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基于复变函数与Maxwell-Betti功互等定理的矩形隧道地表沉降预测方法 认领 引用
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作者 胡达 刘晶 +3 位作者 黎永索 杨仙 谭泽 翁晓轩 《工程地质学报》 CSCD 北大核心 2026年第4期1729-1739,共11页
在矩形隧道施工期间,周边地层受扰动后的破坏机理尚不明确。这种不确定性极有可能引发地表坍塌,进而致使周边建筑变形、地下管线破裂等一系列严重工程灾害。同时,现有的地表沉降预测方法存在精度不足的问题。鉴于此,基于复变函数和Maxwe... 在矩形隧道施工期间,周边地层受扰动后的破坏机理尚不明确。这种不确定性极有可能引发地表坍塌,进而致使周边建筑变形、地下管线破裂等一系列严重工程灾害。同时,现有的地表沉降预测方法存在精度不足的问题。鉴于此,基于复变函数和Maxwell-Betti功互等定理提出一种矩形隧道施工地表沉降预测方法。首先,依据功互等定理构建两种处于不同受力状态下的二维矩形隧道计算模型。其次,通过保角变换将矩形隧道映射为圆形,进而得出矩形隧道洞身位移的计算式。再者,对Sagaseta法加以改进,使其适用于矩形隧道的计算。然后,基于功互等定理推导隧道地层损失的计算式,并结合改进后的Sagaseta法计算矩形隧道开挖所引起的地表沉降。最后,通过4组数值模拟与3项工程实测数据验证方法有效性。研究结果表明,理论分析与数值模拟值基本相符,且与3个矩形隧道工程的监测值具有更高的吻合度,能较好地适应不同地层环境下矩形隧道地表沉降预测,可为实际工程提供参考依据。 展开更多
关键词 矩形隧道 地表沉降 Maxwell-Betti功互等定理 复变函数 地层损失
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矩形顶管减摩注浆扩散机制SPH模拟及试验验证 认领 引用
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作者 李培楠 刘雨晴 +3 位作者 邱龑 甄亮 张中杰 王长虹 《铁道工程学报》 EI CSCD 北大核心 2026年第1期74-81,共8页
研究目的:为解决超大断面矩形顶管由于自身断面的几何特性,减摩注浆扩散效率较低,浆液容易产生淤积的问题,本文研究减摩泥浆不同组成成分的含量变化对浆液性能的影响。同时借助光滑粒子流体动力学方法,对矩形顶管减摩注浆的运动特征和... 研究目的:为解决超大断面矩形顶管由于自身断面的几何特性,减摩注浆扩散效率较低,浆液容易产生淤积的问题,本文研究减摩泥浆不同组成成分的含量变化对浆液性能的影响。同时借助光滑粒子流体动力学方法,对矩形顶管减摩注浆的运动特征和扩散模式进行数值模拟,分析浆液在管土间隙中的运动机制。最后通过对比可视化大型模型试验结果,对数值仿真结果的合理性进行验证。研究结论:(1)当膨润土含量大于4%时,才能有效发挥其他添加剂的作用,其中CMC(羧甲基纤维素钠)可以显著降低泥浆滤失量,而HS-3(高性能盾构泥浆专用材料)可以显著提高动切力和触变性,PAM(聚丙烯酰胺)可以提高各项性能指标,不过变化幅度较缓;(2)减摩泥浆在从注浆孔注出后,会首先顺着沟槽流动下来,迅速填充整个底面,从而在底面形成一层浆土混合物,有效降低管土摩阻力;(3)初始注浆阶段,建议上部和侧部以及底部注浆孔同时注浆;持续顶进过程中,改为上部和侧部注浆孔同时注浆;注浆过程中,随着管片的不断移动,会对周围土体与管片的接触形态造成改变,并且随着泥浆的渗透和流失,应及时补浆,保证泥浆套的完整性;(4)本研究结果可为矩形顶管工程的设计和施工提供理论支持和数据参考。 展开更多
关键词 隧道 矩形顶管 减摩注浆 扩散运动机制 SPH模拟 可视化试验
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全预制矩形装配式地铁车站接头力学性能研究 认领 引用
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作者 凌同华 周智辉 +2 位作者 谭嘉诺 谢子龙 廖逸轩 《中国公路学报》 EI CAS CSCD 北大核心 2026年第3期438-448,共11页
全预制矩形装配式地铁车站作为一种新型结构,能够有效提升施工质量与速度,但其接头构件连接影响尚不明晰。为探究其最优接头形式及其力学性能,通过室内足尺试验对比分析了6种连接形式(2种榫槽形式,3种螺栓连接方式)下接头构件的力学变... 全预制矩形装配式地铁车站作为一种新型结构,能够有效提升施工质量与速度,但其接头构件连接影响尚不明晰。为探究其最优接头形式及其力学性能,通过室内足尺试验对比分析了6种连接形式(2种榫槽形式,3种螺栓连接方式)下接头构件的力学变形特征,并以深圳某矩形装配式地铁车站为工程背景,通过数值模拟手段分析车站结构对于接头构件各连接形式的响应程度。结果表明:①6种连接形式的接头构件均可满足车站结构正常运营条件下的承载力需求,单榫槽构件在线性承载阶段内变形略低于双榫槽构件,螺栓能有效限制接头构件跨中挠度增大,弯螺栓抑制效果最佳;②破坏加载阶段内,弯螺栓对于接头构件极限弯矩承载值提升最大,提升量为23.9%,相同螺栓条件下,单榫槽构件极限弯矩承载值大于双榫槽构件;③接头构件抗弯刚度曲线由三阶段组成,具有显著的变刚度特征,弯螺栓构件进入迅速下降阶段时抗弯刚度最大,弯螺栓单榫槽接头构件在极限弯矩承载值、抗弯刚度与变形能力上均优于其余工况;④采用6种接头构件连接的全预制矩形装配式地铁车站,最大主应力较大值均出现于顶板角部、中板两侧与底板下侧,最小主应力较大值则均位于顶板内侧角部、顶板外侧、底板与中柱连接处,车站整体结构在弯螺栓单榫槽接头形式下受力最优。 展开更多
关键词 隧道工程 矩形装配式地铁车站 足尺试验 接头构件 接头形式 力学性能
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矩形隧道下穿对既有隧道受力变形的计算方法 认领 引用
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作者 冯乐乐 段世雄 +1 位作者 于建 王柏文 《河北工程大学学报（自然科学版）》 CAS 2026年第2期54-64,共11页
为研究矩形隧道下穿施工对既有隧道变形的影响规律,提出了关于矩形隧道下穿既有隧道的半解析解。首先,基于矩形隧道开挖后断面收敛变形的特点,基于随机介质理论推导出矩形隧道开挖诱发的地层变形规律,将既有隧道视为搁置在Kerr地基模型... 为研究矩形隧道下穿施工对既有隧道变形的影响规律,提出了关于矩形隧道下穿既有隧道的半解析解。首先,基于矩形隧道开挖后断面收敛变形的特点,基于随机介质理论推导出矩形隧道开挖诱发的地层变形规律,将既有隧道视为搁置在Kerr地基模型上的Euler-Bernoulli梁,最终获得既有隧道的纵向受力平衡微分方程,并采用有限差分获得矩形隧道下穿对既有隧道受力变形的计算方法。通过与室内模型试验值进行对比,验证了本文计算结果的准确性。最后,针对矩形隧道宽度、埋深、土体内摩擦角、既有隧道抗弯刚度和地层损失率等关键参数展开影响分析。结果表明:矩形隧道半宽和地层损失率增大会导致既有隧道的竖向变形线性增加;隧道埋深减小会导致既有隧道竖向峰值显著增大,但会缩小对隧道沉降的影响范围;增大土体内摩擦角会导致既有隧道的竖向变形显著增大,同时使隧道变形槽略微减小;随着既有隧道抗弯刚度的增加,隧道的竖向变形会明显减小。 展开更多
关键词 矩形隧道 收敛变形 随机介质 地基模型 隧道变形 参数分析
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超浅覆土超大断面矩形顶管施工地表竖向变形研究 认领 引用
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作者 赵立都 王俊强 +2 位作者 南迎军 向中富 陈阁琳 《测绘与空间地理信息》 2026年第5期5-8,共4页
为研究超浅覆土矩形顶管施工过程中地表的竖向变形规律,本文依托重庆市某下穿道超大断面矩形顶管工程,设计开发了基于测量机器人的自动化变形感知系统,可实时、自动化监测施工过程中地表竖向位移。研究结果表明,矩形顶管施工引起的地表... 为研究超浅覆土矩形顶管施工过程中地表的竖向变形规律,本文依托重庆市某下穿道超大断面矩形顶管工程,设计开发了基于测量机器人的自动化变形感知系统,可实时、自动化监测施工过程中地表竖向位移。研究结果表明,矩形顶管施工引起的地表竖向变形表现为沉降,主要是开挖面推力、管节外壁的摩擦力、地层损失以及注浆压力共同作用的结果。研究结果对超大断面矩形顶管技术应用于超浅覆土地质的深度和有效推广具有重要意义。 展开更多
关键词 隧道 矩形顶管 地表沉降 监测分析 下穿
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矩形高层建筑顺风向脉动风荷载空间相关性 认领 引用 被引量：2
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作者 袁家辉 陈水福 +1 位作者 夏俞超 刘奕 《北京航空航天大学学报》 EI CAS CSCD 北大核心 2026年第3期772-783,共12页
为探讨建筑深宽比和来流湍流特性对矩形高层建筑顺风向脉动风荷载空间相关性的影响,对深宽比为1/9~9的矩形高层建筑在4种风场中进行了同步测压风洞试验。基于试验结果,分析建筑深宽比、湍流强度和湍流积分尺度对顺风向脉动风荷载竖向相... 为探讨建筑深宽比和来流湍流特性对矩形高层建筑顺风向脉动风荷载空间相关性的影响,对深宽比为1/9~9的矩形高层建筑在4种风场中进行了同步测压风洞试验。基于试验结果,分析建筑深宽比、湍流强度和湍流积分尺度对顺风向脉动风荷载竖向相关系数和相干函数的影响;通过非线性最小二乘法,拟合得到了适用于深宽比为1/9~9的矩形高层建筑竖向相关性数学模型。结果表明:顺风向脉动风荷载相关系数同时受到建筑深宽比和测点层高差影响,相关系数随测点层高差增大呈指数衰减;顺风向脉动相干函数随频率增大呈指数衰减,且衰减速率与高差和平均风速的比值大致成正比;对于不同深宽比建筑,湍流积分尺度和湍流强度对顺风向脉动风荷载相关性的影响不同;本文针对不同风场提出的矩形高层建筑顺风向脉动风荷载相关系数和相干函数公式和试验结果吻合良好,可为建筑结构设计及荷载规范修订提供参考。 展开更多
关键词 矩形高层建筑 脉动风荷载 空间相关性 风洞试验 深宽比
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砂土地层矩形顶管施工扰动模型试验 认领 引用 被引量：3
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作者 李建业 许有俊 +5 位作者 张旭 房倩 马周伟 王拓 茹振华 刘翔 《中国公路学报》 EI CAS CSCD 北大核心 2026年第4期318-331,共14页
为系统研究矩形顶管隧道施工对砂土地层变形的扰动特征,研发了一套土压平衡矩形顶管模型试验平台。该平台由模型土箱、顶管模型机、注浆系统以及控制与监测系统等部分组成,能够精细化模拟土体切削、渣土排出、管节顶进与衬砌支护等关键... 为系统研究矩形顶管隧道施工对砂土地层变形的扰动特征,研发了一套土压平衡矩形顶管模型试验平台。该平台由模型土箱、顶管模型机、注浆系统以及控制与监测系统等部分组成,能够精细化模拟土体切削、渣土排出、管节顶进与衬砌支护等关键施工工艺。基于该试验平台,开展了砂土地层矩形顶管顶进施工的模型试验。试验过程中,系统监测了顶管顶进引起的地层变形及围岩压力变化,详细分析了矩形顶管施工诱发的地层变形特征和围岩压力演化规律。试验结果表明:矩形顶管隧道顶进施工引起的地表沉降呈现高斯分布特征,显著沉降区域主要集中在隧道中轴线两侧各1.0H(H为矩形顶管高度)范围内;地表沉降量和沉降槽宽度与地层损失率密切相关;地层损失率越大,地表最大沉降量显著增加,而沉降槽宽度则相应减小;拱顶土压力在施工过程中表现出“先减后稳”的演化规律,压力卸载区主要分布在隧道轴线两侧(0.5B+0.25H)范围内(B为矩形顶管宽度);此外,土体沉降的发展具有显著的时空演化特征;施工初期,近场区(距拱顶0.25H)土体率先发生快速沉降;随着顶管推进,远场区(距拱顶0.75H至1.25H)土体的沉降逐渐增大。研究成果可为砂土地层中矩形顶管的安全施工提供重要参考。 展开更多
关键词 隧道工程 扰动特征 模型试验 砂土地层 矩形顶管模型机 地层变形 土压力
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充填体内掘进巷道围岩稳定性分析与控制研究 认领 引用 被引量：1
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作者 罗准 陆光艳 郑志杰 《有色金属（矿山部分）》 CAS 2026年第1期77-84,共8页
某磷矿随着开采的进行,需要在充填体掘进巷道,如何维护充填体内巷道的稳定,成为该磷矿面临的重要难题。针对上述问题,采用现场调查、理论分析和现场试验等手段开展了研究。首先,分析了巷道变形和破坏特征及破坏原因,认为受到充填体围岩... 某磷矿随着开采的进行,需要在充填体掘进巷道,如何维护充填体内巷道的稳定,成为该磷矿面临的重要难题。针对上述问题,采用现场调查、理论分析和现场试验等手段开展了研究。首先,分析了巷道变形和破坏特征及破坏原因,认为受到充填体围岩性质和地应力的影响,该矿巷道破坏模式主要有拉裂破坏、局部剪切破坏和局部冒落破坏。其次,根据充填体特征,确定充填体内巷道断面形状为矩形,在此基础上,基于统一强度理论,优化得到了巷道断面尺寸为4 m×4 m;再次,给出了优化的矩形巷道支护方案,采用管缝锚杆支护,长度为1.5 m、支护夹角为45°~50°;最后,将得到的矩形巷道方案应用到该矿的工程实践当中,结果表明,巷道施工后围岩没有发生明显的变形和破坏,取得了良好的施工效果,保证了巷道的稳定性。 展开更多
关键词 充填体 巷道掘进 围岩控制 矩形巷道 统一强度理论
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Investigating Effect of Tunnel Gate Shapes with Similar Cross Section on Inserted Forces on Its Coverage and Soil Surface Settlement 认领 引用 被引量：3
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作者 Arash Rostami Nima Asghari +2 位作者 Morteza Askari Ziarati Saman Jahani Bahman Shahi 《Open Journal of Civil Engineering》 2016年第3期358-369,共12页
According to technology development and relative facilitation in digging and underground structures, ways, highways, all types of tunnels, underground train network, and other underground settle, storage are number of... According to technology development and relative facilitation in digging and underground structures, ways, highways, all types of tunnels, underground train network, and other underground settle, storage are number of structure built and developed in advanced countries. In most situation, tunnel digging operations are done years after its construction or are not recorded in new structures regulations;therefore, this research investigates soil settlement and inserting force to tunnel coverage by limiting studies about effects of tunnel shapes on soil settlement using Plaxis, Seismo Signal, and Seismo Aspect. This study shows that rectangular tunnel has the most settlement in soil surface and circular tunnel has the least settlement but horseshoe tunnel has similar behavior to circular tunnel;however, earth subsidence level by digging this tunnel is more than circular tunnel. In addition, sectional shape has direct effect on inserting forces on tunnel coverage. 展开更多
关键词 Soil Settlement Rectangular Tunnel Circular Tunnel Horseshoe Tunnel Concrete Coverage
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强震区软弱围岩矩形隧道减震层不同布置范围的减震效果 认领 引用
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作者 梁为进 崔光耀 宁茂权 《吉首大学学报（自然科学版）》 CAS 2026年第2期54-61,共8页
为了提升软弱围岩地层的浅埋矩形隧道在受强震影响时的安全性,利用有限元软件ABAQUS对某工程矩形隧道减震层不同布置范围的减震效果进行了对比分析.结果表明,与无减震层的工况1相比,增加管片结构后,工况2(垫层减震层)、工况3(半包减震层... 为了提升软弱围岩地层的浅埋矩形隧道在受强震影响时的安全性,利用有限元软件ABAQUS对某工程矩形隧道减震层不同布置范围的减震效果进行了对比分析.结果表明,与无减震层的工况1相比,增加管片结构后,工况2(垫层减震层)、工况3(半包减震层)、工况4(全包减震层)的减震效果均明显提升,工况3的减震效果最优;与工况1相比,工况3的最大主应力峰值、最小主应力峰值、最大剪应力、最大横向位移、最大竖向位移、最小安全系数减震效果分别提升了8.893%,13.433%,5.698%,15.190%,41.860%,27.590%.因此,在抗震设计中,建议该工程优先采用半包减震层的构造方案. 展开更多
关键词 矩形隧道 强震区 软弱围岩 减震层 减震效果
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