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Dynamic soil-tunnel interaction in layered half-space for incident plane SH waves

Earthquake Engineering and Engineering Vibration 2016年第4期15卷 715-727页

作者： Fu Jia Liang Jianwen Qin Lin State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Department of Civil Engineering Tianjin University

The dynamic soil-tunnel interaction is studied by indirect boundary element method （IBEM）, using the model of a rigid tunnel in layered half-space, which is simplified to a single soil layer on elastic bedrock, subjected to incident plane SH waves. The accuracy of the results is verified through comparison with the analytical solution. It is shown that soil-tunnel interaction in layered half-space is larger than that in homogeneous half-space and this interaction mechanism is essentially different from that of soil-foundation-superstructure interaction.

关键词： underground tunnel layered half-space plane SH wave indirect boundary element method soil-tunnel interaction site dynamic characteristics

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

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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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Dynamic soil-tunnel interaction in layered half-space for incident P-and SV-waves

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Earthquake Science 2015年第4期28卷 275-284页

作者： Jia Fu Jianwen Liang Lin Qin Department of Civil Engineering Tianjin University Tianjin Key Laboratory of Civil Engineering Structures & New Materials

The dynamic soil-tunnel interaction is studied by the model of a rigid tunnel embedded in layered half-space, which is simplified as a single soil layer on elastic bedrock to the excitation of P- and SV-waves. The indirect boundary element method is used, combined with the Green＇ s function of distributed loads acting on inclined lines. It is shown that the dynamic characteristics of soil-tunnel interaction in layered half-space are different much from that in homoge- neous half-space, and that the mechanism of soil-tunnel interaction is also different much from that of soil-founda- tion-superstructure interaction. For oblique incidence, the tunnel response for in-plane incident SV-waves is com- pletely different from that for incident SH-waves, while the tunnel response for vertically incident SV-wave is very similar to that of vertically incident SH-wave.

关键词： Underground tunnel Layered half-space P-wave and SV-wave indirect boundary element method Soil-tunnel interaction ~ Site dynamic characteristics

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The scattering of plane P1 wave by a 3-D sedimentary basin in a fluid-saturated poroelastic half-space using IBEM

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Earthquake Science 2019年第3期32卷 143-156页

作者： Chenrui He Zhongxian Liu Lei Liu Tianjin Key Laboratory of Civil Structure Protection and Reinforcing Tianjin Chengjian UniversityTianjin 300384China

The indirect boundary element method(IBEM)is applied to investigate the scattering of elastic waves around a 3-D sedimentary basin filled with fluid-saturated poroelastic *** on this method,the free field and scattered field can be solved according to the boundary *** the numerical accuracy has been *** effects of parameters on elastic wave scattering are studied,such as boundary condition,incident frequency,incident angle and porosity of *** results illustrate that the amplification effect of surface displacement near poroelastic sedimentary basin is *** addition,for the case of large porosity the drainage condition has a significant impact on the response *** to the fluid exchange at the interface under the drained condition,the displacement amplitude can be much larger than that under the undrained condition in present *** study can provide a theoretical basis for the anti-seismic design of engineering structures located in sedimentary basin.

关键词： indirect boundary element method scattering of elastic waves sedimentary basin fluid-saturated poroelastic medium

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Comparison of indirect boundary element and finite element methods A case study:Shiraz-Esfahan railway tunnel in Iran

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Frontiers of Structural and Civil Engineering 2012年第4期6卷 385-392页

作者： Amin MANOUCHEHRIAN Mohammad Fatehi MARJI Mohsen MOHEBBI Mining and Metallurgical Engineering Department Yazd UniversityYazd 89195Iran

Because of the high importance of transportation tunnels,most precise analyses of stress concentration and displacement around them are essential to provide safety of them as much as ***,various numerical methods such as finite element method(FEM),discrete element method(DEM),finite difference method(FDM)and boundary element method(BEM)have been used extremely in geosciences problems,but among these numerical methods,BEM has been used less than others because the computational algorithm is not so *** paper suggests the implementation of the indirect boundary element method(IBEM)as a formulation of BEM to analyze displacement around Shiraz-Esfahan railway tunnel in Zagros Mountains southwest of *** this purpose,this tunnel has been modeled numerically using two-dimensional fictitious stress method(TWOFS)*** validate the results,they were compared with FEM results as a commonly used numerical *** of current theoretical study have shown that the presented approach using IBEM is reasonably accurate and can be used for analysis of displacement in geosciences *** rock mechanics,for problems with a low ratio of boundary surface to volume,FEM is not very well suited and may be cumbersome,but use of such a proposed IBEM approach can be particularly attractive.

关键词： indirect boundary element method finite element method displacement tunnel case study

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