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Seismic response of tunnel near fault fracture zone under incident SV waves

Underground Space 2021年第6期6卷 695-708页

作者： Zhongxian Liu Jiaqiao Liu Qiang Pei Haitao Yu Chengcheng Li Chengqing Wu Tianjin Key Laboratory of Soft Soil Properties and Engineering Environment Tianjin Chengjian UniversityTianjin 300384China Research&Development Center of Civil Engineering Technology Dalian UniversityDalian 116622China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China School of Civil and Environmental Engineering University of Technology SydneyNSWAustralia

This study investigated the impact of a non-causative fault on the dynamic response of a nearby lined tunnel under the incidence of plane SV waves using the indirect boundary element *** effects of several critical parameters,such as the incident frequency,the inclination degree of the fault,the distance between the fault and the tunnel on the hoop stress of the lined inner and outer walls,were explored *** numerical results indicated that the non-causative fault could significantly change the hoop stress distribution of inner and outer surfaces of the *** general,for the vertically incident seismic waves,when the tunnel was located in the foot wall(under the fault),the hoop stress within the tunnel was significantly greater than that of the tunnels in the non-fault half space,with an amplification factor of up to 117%.The amplification effect became more pronounced as the fault dip angle ***,when the tunnel was located in the hanging wall(above the fault),the non-causative fault could produce a significant shielding effect on the dynamic response of the tunnel under high frequency wave incidence,with the reduction of hoop stress being up to 81%.For lowfrequency waves,though,the fault could lead to an increase of the hoop stress of the tunnel of up to 152%.The research results will provide a reference for the seismic design and safety protection of underground structures in non-causative fault sites.

关键词： Non-causative fault Indirect boundary element method fault fracture zone Lined tunnel

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Response of underground pipeline through fault fracture zone to random ground motion

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Earthquake Science 2011年第4期24卷 351-363页

作者： Dai Wang Zhuobin Wei Jianwen Liang Postdoctoral Station of Naval Architecture and Ocean Engineering Naval University of Engineeringi Wuhan 30033 China Department of Logistics Command and Engineering Naval University of Engineering Tianjin 300450 China Department of Civil Engineering Tianjin University Tianjin 300072 China

It is assumed that a pipeline is laid through a vertical fault fracture zone, and is excited by seismic ground motion modelled as stationary stochastic process. For horizontal incidence of waves, the cross-PSD （Power Spectral Density） function is developed using wave propagation theory, while for vertical incidence of waves the cross-PSD function is composed by auto-PSD model, coherence model and site response model. As the seismic input, the eross-PSD function is used to calculate the the axial and lateral seismic responses of underground pipeline through the fracture zone. The results show that the incident directions of seismic waves, width and soil property of the fracture zone have great influence on underground pipeline. It is suggested that the flexible joints with appropriate stiffness should be added into the pipeline near the interfaces between the fracture zone and the surrounded media.

关键词： fault fracture zone flexible joint underground pipeline seismic excitation

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Analysis of Force Chain Structure and Evolution Characteristics of Friction-sliding in fault fracture zone

Analysis of Force Chain Structure and Evolution Characterist...

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作者： Yatai ZHAN Jin-an WANG Pengzhao REN School of Civil and Resource Engineering University of Science and Technology Beijing

Based on the principle of photoelastic experiment,by photoelastic equipment of particles under biaxially loading and bilaterally flowing conditions,the average coordination number of particulate matters in fracture zone,the evolution of the force chain and the topological characteristics of force chain structure network are studied in the process of fault friction *** results show that the average coordination number can reflect the macro-friction sliding characteristics of rock particles in fault fracture *** the occurrence of shear shrinkage of rock particles,the average coordination number of the fracture zone *** the increase of vertical deformation of dilatancy,the average coordination number *** distribution of the force chain in the fracture zone is anisotropic;meanwhile,the shear friction can enhance the anisotropic distribution of the force *** "strong section" and the "weak section" of the interaction between the fracture zone and the fault-induced fracture zone reveal the non-uniform characteristics of the spatial deformation of the fracture zone in the process of frictional sliding,and the rearrangement of particulate matter in rock mass causes the dynamic evolution of the strong and weak *** force chain can be divided into four configurations:chain-shaped,arch-shaped,chain-arch coupling and arch-arch *** chained force chain is mainly distributed in the middle of the fault fracture zone,while the arched force chain is mainly distributed in the fracture zone near the induced fracture zone on both *** number can be used to represent the configuration and strength of the force chain.

关键词： fault fracture zone Photoelastic experiment Coordination number Topology Force chain configuration

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Numerical investigation of geostress influence on the grouting reinforcement effectiveness of tunnel surrounding rock mass in fault fracture zones

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 81-101页

作者： Xiangyu Xu Zhijun Wu Lei Weng Zhaofei Chu Quansheng Liu Yuan Zhou The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province School of Civil EngineeringWuhan UniversityWuhan430072China Wuhan University Shenzhen Research Institute Shenzhen518057China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhan430071China

Grouting is a widely used approach to reinforce broken surrounding rock mass during the construction of underground tunnels in fault fracture zones,and its reinforcement effectiveness is highly affected by *** this study,a numerical manifold method(NMM)based simulator has been developed to examine the impact of geostress conditions on grouting reinforcement during tunnel *** develop this simulator,a detection technique for identifying slurry migration channels and an improved fluid-solid coupling(FeS)framework,which considers the influence of fracture properties and geostress states,is developed and incorporated into a zero-thickness cohesive element(ZE)based NMM(Co-NMM)for simulating tunnel ***,to simulate coagulation of injected slurry,a bonding repair algorithm is further proposed based on the ZE *** verify the accuracy of the proposed simulator,a series of simulations about slurry migration in single fractures and fracture networks are numerically reproduced,and the results align well with analytical and laboratory test ***,these numerical results show that neglecting the influence of geostress condition can lead to a serious over-estimation of slurry migration range and reinforcement *** validations,a series of simulations about tunnel grouting reinforcement and tunnel excavation in fault fracture zones with varying fracture densities under different geostress conditions are *** on these simula-tions,the influence of geostress conditions and the optimization of grouting schemes are discussed.

关键词： Numerical manifold method(NMM) Grouting reinforcement Geostress condition fault fracture zone Tunnel excavation

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Unconfined compressive strength and failure behaviour of completely weathered granite from a fault zone

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Journal of Mountain Science 2024年第6期21卷 2140-2158页

作者： DU Shaohua MA Jinyin MA Liyao ZHAO Yaqian School of Civil Engineering and Architecture Henan University of Science and TechnologyLuoyang 471023China School of Resources and Safety Engineering Central South UniversityChangsha 410083China China Railway 18th Bureau Group Co. LtdTianjin 300222 China China General Nuclear Power Corporation Shenzhen 518031China

Understanding the strength characteristics and deformation behaviour of the tunnel surrounding rock in a fault zone is significant for tunnel stability *** this study,a series of unconfined compression tests were conducted to investigate the mechanical characteristics and failure behaviour of completely weathered granite(CWG)from a fault zone,considering with height-diameter(h/d)ratio,dry densities(ρd)and moisture contents(ω).Based on the experimental results,a regression mathematical model of unconfined compressive strength(UCS)for CWG was developed using the Multiple Nonlinear Regression method(MNLR).The research results indicated that the UCS of the specimen with a h/d ratio of 0.6 decreased with the increase ofω.When the h/d ratio increased to 1.0,the UCS increasedωwith up to 10.5%and then ***ρd is conducive to the improvement of the UCS at anyω.The deformation and rupture process as well as final failure modes of the specimen are controlled by h/d ratio,ρd andω,and the h/d ratio is the dominant factor affecting the final failure mode,followed byωandρ*** specimens with different h/d ratio exhibited completely different fracture mode,i.e.,typical splitting failure(h/d=0.6)and shear failure(h/d=1.0).By comparing the experimental results,this regression model for predicting UCS is accurate and reliable,and the h/d ratio is the dominant factor affecting the UCS of CWG,followed byρd and thenω.These findings provide important references for maintenance of the tunnel crossing other fault fractured zones,especially at low confining pressure or unconfined condition.

关键词： fault fracture zone Completely weathered granite(CWG) Unconfined compression strength(UCS) Multiple nonlinear regression model

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大相岭隧道断层破碎带围岩变形的GA-BP神经网络预测技术

大相岭隧道断层破碎带围岩变形的GA-BP神经网络预测技术

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第3届全国工程安全与防护学术会议

作者：张志强李化云张浩西南交通大学土木工程学院地下工程系

在隧道新奥法施工中,围岩变形量常作为评判围岩稳定性和支护结构经济合理性的重要指标。隧道围岩变形量是随时间而变化的数列,一般可以建立一些实时跟踪预测模型和方法。针对雅西高速公路大相岭隧道软弱围岩区段施工断层破碎带围岩变形... 详细信息

在隧道新奥法施工中,围岩变形量常作为评判围岩稳定性和支护结构经济合理性的重要指标。隧道围岩变形量是随时间而变化的数列,一般可以建立一些实时跟踪预测模型和方法。针对雅西高速公路大相岭隧道软弱围岩区段施工断层破碎带围岩变形的变形速率大,持续时间长,变形量大等特点,基于GA-BP人工神经网络原理,建立了断层破碎带围岩变形综合预测模型,采用GA-BP神经网络技术对其变形量进行了预测,预测结果经过工程实践检验,具有较高的可靠性和准确性,为隧道施工决策提供了依据。

关键词： fault fracture zone GA-BP nerve network Deformation prediction

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