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Optimization of long-hole raise blasting considering drilling deviations:Theoretical and numerical approaches 认领 引用
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作者 Xianyang Qiu Wenbo Shen +4 位作者 Rihong Cao Xiuzhi Shi Yongsheng Xie Wei Liu Zhigang Tian 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5380-5395,共16页
Long-hole raise blasting(LHRB)is a highly efficientexcavation method that is used extensively in underground mining and civil engineering.However,deviations in drilling are usually not accounted for in LHRB,which may ... Long-hole raise blasting(LHRB)is a highly efficientexcavation method that is used extensively in underground mining and civil engineering.However,deviations in drilling are usually not accounted for in LHRB,which may adversely affect the efficiencyand progress of raise excavation.In this paper,the effect of drilling deviation on the optimization of LHRB is investigated.The actual trajectories of the blastholes were measured,and the deviation rates between different diameters were compared.The effects of the drilling deviation on the burn-cut blasting mode(BCBM)and spherical cartridge blasting mode(SCBM)of LHRB were theoretically analyzed.Numerical models with vertical holes that consider the actual hole location at different positions of the raise were subsequently developed to simulate the raise blasting damage.The results indicated that the BCBM relied substantially on the drilling accuracy to provide free surface and compensation space for further blasting,whereas the requirements of drilling deviation for the SCBM were less strict.With increasing hole deviation in the BCBM,the height of the failure area of the raise blasting increased.Optimization designs that combine the BCBM and SCBM were proposed to strike a balance between the efficiencyand reliability of LHRB.A 40 m high slot raise in a large-diameter long-hole(LDL)stope was successfully formed by multimode LHRB.The fieldtest results reveal that the optimization of LHRB is feasible in practical engineering. 展开更多
关键词 Long-hole raise blasting(LHRB) Drilling deviation Blasting optimization Numerical simulation Field test
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Bond length and interface failure mechanism of anchor cable under continuous radial pressure conditions 认领 引用 被引量：3
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作者 Jian Ouyang Xiuzhi Shi +2 位作者 Xianyang Qiu Zongguo Zhang Zeyu Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第2期231-247,共17页
The anchoring capacity of the anchor cable is closely related to the bonding length and radial pressure conditions.Through field pull-out tests,theoretical analysis,numerical simulation,and industrial tests,this study... The anchoring capacity of the anchor cable is closely related to the bonding length and radial pressure conditions.Through field pull-out tests,theoretical analysis,numerical simulation,and industrial tests,this study clarifies the relationship between radial pressure and bonding length for the ultimate pullout force and reveals the microscopic failure process of the resin-rock interface in the anchoring system.The results show that the ultimate load increases with the increase of bonding length in three different stages:rapid,slow,and uniform growth.The new mechanical model developed considering radial pressure describes the inverse relationship between radial pressure and the plastic zone on the bonding section,and quantifies the reinforcing effect of confining pressure on the anchoring force.During the pull-out process of the anchor cable,the generation of failure cracks is in the order of orifice,bottom,and middle of the hole.Radial pressure can effectively enhance the ultimate pull-out force,alleviate the oscillation increase of pull-out force,and inhibit resin cracking,but will produce an external crushing zone.It also reveals the synergistic effect between bonding length and radial pressure,and successfully carries out industrial tests of anchor cable support,which ensures the stability of the stope roof and provides an important reference for the design of anchor cable support in deep high-stress mines. 展开更多
关键词 Radial pressure Anchor cable Bond length Numerical simulation Interface failure Microscopic process
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High strain rate compressive strength behavior of cemented paste backfill using split Hopkinson pressure bar 认领 引用 被引量：13
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作者 Xin Chen Xiuzhi Shi +3 位作者 Jian Zhou Enming Li Peiyong Qiu Yonggang Gou 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2021年第3期387-399,共13页
The stability of cemented paste backfill(CPB)is threatened by dynamic disturbance,but the conventional low strain rate laboratory pressure test has difficulty achieving this research purpose.Therefore,a split Hopkinso... The stability of cemented paste backfill(CPB)is threatened by dynamic disturbance,but the conventional low strain rate laboratory pressure test has difficulty achieving this research purpose.Therefore,a split Hopkinson pressure bar(SHPB)was utilized to investigate the high strain rate compressive behavior of CPB with dynamic loads of 0.4,0.8,and 1.2 MPa.And the failure modes were determined by macro and micro analysis.CPB with different cement-to-tailings ratios,solid mass concentrations,and curing ages was prepared to conduct the SHPB test.The results showed that increasing the cement content,tailings content,and curing age can improve the dynamic compressive strength and elastic modulus.Under an impact load,a higher strain rate can lead to larger increasing times of the dynamic compressive strength when compared with static loading.And the dynamic compressive strength of CPB has an exponential correlation with the strain rate.The macroscopic failure modes indicated that CPB is more seriously damaged under dynamic loading.The local damage was enhanced,and fine cracks were formed in the interior of the CPB.This is because the CPB cannot dissipate the energy of the high strain rate stress wave in a short loading period. 展开更多
关键词 High strain rate Compressive strength behavior Cemented paste backfill Split Hopkinson pressure bar Tailings
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Evaluation of underground blast-induced ground motions through nearsurface low-velocity geological layers 认领 引用 被引量：4
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作者 Yonggang Gou Xiuzhi Shi +2 位作者 Zhi Yu Xiaofeng Huo Xianyang Qiu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第3期600-617,共18页
Surface ground motion produced by underground blasts is significantly influenced by near-surface geological conditions.However,near-surface low-propagation velocity layers were always ignored in past analyses of groun... Surface ground motion produced by underground blasts is significantly influenced by near-surface geological conditions.However,near-surface low-propagation velocity layers were always ignored in past analyses of ground motions due to their thin thickness.With the rising concern about surface ground motions produced by the ascendant scale and frequentness of underground excavation and mining,close attention is gradually paid to ground blast vibrations.Therefore,systemic experiments were conducted and took seven months in an underground mine to clarify the variation of motion from underground rock to surface ground.The attenuation of surface ground peak particle velocities(PPVs)is compared to that in underground rock,and horizontal amplitudes are compared to vertical amplitudes.Differences between bedrock and surface ground vibrations are analyzed to illustrate the site effect of near-surface lower-propagation velocity layers.One-dimensional site response analysis is employed to quantify the influence of different geological profiles on surface ground vibrations.The experimental data and site response analysis allowed the following conclusions:(1)geological site effects mainly produce decreasing dominant frequency(DF)of surface ground vibrations;(2)the site amplification effect of blast vibration needs to be characterized by peak particle displacement(PPD);(3)shear waves(S-waves)begin to dominate and surface Rayleigh waves(R-waves)develop as blast-induced ground vibrations travel upward through rock and lower-velocity layers to the surface.The comparison of response relative displacement to a critical value is best to assess the potential for cracking on surface structures. 展开更多
关键词 Surface ground motions Underground blasts Geological site condition Amplitude attenuation Site response analysis
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AMicroseismic Signal Denoising Algorithm Combining VMD and Wavelet Threshold Denoising Optimized by BWOA 认领 引用 被引量：1
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作者 Dijun Rao Min Huang +2 位作者 Xiuzhi Shi Zhi Yu Zhengxiang He 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第10期187-217,共31页
The denoising of microseismic signals is a prerequisite for subsequent analysis and research.In this research,a new microseismic signal denoising algorithm called the Black Widow Optimization Algorithm(BWOA)optimized ... The denoising of microseismic signals is a prerequisite for subsequent analysis and research.In this research,a new microseismic signal denoising algorithm called the Black Widow Optimization Algorithm(BWOA)optimized VariationalMode Decomposition(VMD)jointWavelet Threshold Denoising(WTD)algorithm(BVW)is proposed.The BVW algorithm integrates VMD and WTD,both of which are optimized by BWOA.Specifically,this algorithm utilizes VMD to decompose the microseismic signal to be denoised into several Band-Limited IntrinsicMode Functions(BLIMFs).Subsequently,these BLIMFs whose correlation coefficients with the microseismic signal to be denoised are higher than a threshold are selected as the effective mode functions,and the effective mode functions are denoised using WTD to filter out the residual low-and intermediate-frequency noise.Finally,the denoised microseismic signal is obtained through reconstruction.The ideal values of VMD parameters and WTD parameters are acquired by searching with BWOA to achieve the best VMD decomposition performance and solve the problem of relying on experience and requiring a large workload in the application of the WTD algorithm.The outcomes of simulated experiments indicate that this algorithm is capable of achieving good denoising performance under noise of different intensities,and the denoising performance is significantly better than the commonly used VMD and Empirical Mode Decomposition(EMD)algorithms.The BVW algorithm is more efficient in filtering noise,the waveform after denoising is smoother,the amplitude of the waveform is the closest to the original signal,and the signal-to-noise ratio(SNR)and the root mean square error after denoising are more satisfying.The case based on Fankou Lead-Zinc Mine shows that for microseismic signals with different intensities of noise monitored on-site,compared with VMD and EMD,the BVW algorithm ismore efficient in filtering noise,and the SNR after denoising is higher. 展开更多
关键词 Variational mode decomposition microseismic signal denoising wavelet threshold denoising black widow optimization algorithm
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