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Microscopic cracking behaviors of rocks under uniaxial compression with microscopic multiphase heterogeneity by deep learning

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International Journal of Mining Science and Technology 2023年第4期33卷 411-422页

作者： Zhi Zhao yundong shou Xiaoping Zhou School of Civil Engineering Wuhan UniversityWuhan 430072China National Center for International Research on Deep Earth Drilling and Resource Development Faculty of EngineeringChina University of Geosciences(Wuhan)Wuhan 430074China

Cracking behaviors of rocks significantly affect the safety and stability of the explorations of underground space and deep *** understand deeply the microscopic cracking process and mechanical property of rocks,X-ray micro-computed tomography(X-μCT)is applied to capture the rock *** digital color difference UNet(DCD-UNet)-based deep learning algorithm with 3D reconstruction is proposed to reconstruct the multiphase heterogeneity microstructure models of *** microscopic cracking and mechanical properties are studied based on the proposed microstructure-based peridynamic *** show that the DCD-UNet algorithm is more effective to recognize and to represent the microscopic multiphase heterogeneity of *** damage characteristic index of multiphase rocks increases,transgranular cracks in the same grain phase,transgranular and intergranular cracks of pore-grain phase,intergranular and secondary transgranular cracks and transgranular crack between different grains *** ultimate microscopic failure modes of rocks are mainly controlled by the transgranular cracks-based T1-shear,T3-shear,T1-tension,T2-tension and T3-tension failures,and the intergranular cracks-based T1-tension,T1-shear and T3-shear failures under uniaxial compression.

关键词： X-μCT imaging Deep learning Microscopic multiphase heterogeneity Uniaxial compression Transgranular-intergranular cracks

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Experimental and numerical study on dynamic mechanical behaviors of shale under true triaxial compression at high strain rate

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International Journal of Mining Science and Technology 2024年第2期34卷 149-165页

作者： Xiaoping Zhou Linyuan Han Jing Bi yundong shou School of Civil Engineering Wuhan UniversityWuhan 430072China College of Civil Engineering Guizhou UniversityGuiyang 550025China

High-energy gas fracturing of shale is a novel,high efficacy and eco-friendly mining technique,which is a typical dynamic perturbing *** effectively extract shale gas,it is important to understand the dynamic mechanical properties of *** experiments on shale subjected to true triaxial compression at different strain rates are first conducted in this *** dynamic stress-strain curves,peak strain,peak stress and failure modes of shale are *** results of the study indicate that the intermediate principal stress and the minor principal stress have the significant influence on the dynamic mechanical behaviors,although this effect decreases as the strain rate *** characteristics of compression-shear failure primarily occur in shale subjected to triaxial compression at high strain rates,which distinguishes it from the fragmentation characteristics observed in shale under dynamic uniaxial ***,a numerical three-dimensional Split Hopkinson Pressure Bar(3D-SHPB),which is established by coupling PFC3D and FLAC3D methods,is validated to replicate the laboratory characteristics of *** dynamic mechanical characteristics of shale subjected to different confining stresses are systematically investigated by the coupling PFC3D and FLAC3D *** numerical results are in good agreement with the experimental data.

关键词： Dynamic behaviors True triaxial compression High strain rates Dynamic failure mechanism PFC3D-FLAC3D coupled method

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Development of the rolling extrusion rock bolt with constant resistance and large deformation

Deep Resources Engineering

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Deep Resources Engineering 2024年第1期1卷 41-52页

作者： yundong shou Limin Guo Xiaoping Zhou School of Civil Engineering Wuhan UniversityWuhan 430072China China Railway First Survey and Design Institute Group Co. LtdXi’an 710043China

With the increasing excavation depth of underground engineering,engineering problems such as large deformation and rock burst caused by high geo-stress brings new challenges to the excavation and reinforcement of surrounding rock in deep underground *** traditional rock bolt is prone to brittle fracture under high geo-stress due to its low ***,this work aims to develop a novel energy-absorbing bolt with constant resistance and large displacement to reinforce the surrounding rock with a risk of large deformation or *** novel energy-absorbing bolt refereed as rolling extrusion rock bolt(RE bolt)is mainly consists of sleeve tube with a variable cross-section,energy absorption slider with steel balls embedded,steel bar connected with the energy absorption *** rolling extrusion is adopted to produce the resistance force of the RE bolt,which avoids the sudden attenuation of resistance force and the abrasion of the energy absorption *** static pull test is conducted to study the resistance force and deformation characteristics of the RE bolt with different *** imply that the RE bolt has higher resistance force,larger deformation capacity and energy absorption *** work of this study provides an effective solution for the reinforcement of surrounding rock in deep rock engineering.

关键词： Energy-absorbing bolt Rolling extrusion Static pull test Constant resistance Large deformation

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