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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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2.5D scattering of incident plane sh waves by a canyon in layered half-space

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Earthquake Science 2010年第1期23卷 25-33页

作者： Zhenning Ba Jianwen Liang Department of Civil Engineering Tianjin University Tianjin 300072 China

This paper presents 2.5D scattering of incident plane sh waves by a canyon in layered half-space by the indirect boundary element method (IBEM). The free field response is carried out to give the displacements and stresses on the line which forms boundary of the canyon. The fictitious uniform moving loads are applied to the same line to calculate the Green's functions for the displacements and stresses. The amplitudes of the loads are determined by the boundary conditions. The displacements due to the free field and from the fictitious uniform moving loads have to be added to obtain the whole motion. The numerical results are carried out for the cases of a canyon in homogenous and in one layer over bedrock. The results show that the 2.5D wave scattering problem is essentially different from the 2D case, and there exist distinct differences between the wave amplification by a canyon in layered half-space and that in homogeneous half-space. The reasons for the distinct difference are explored, and the effects of the thickness and stiffness of the layer on the amplification are discussed.

关键词： canyon layered half-space plane sh wave amplification 2.5D scattering

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Surface motion of a semi-elliptical hill for incident plane sh waves

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Earthquake Science 2011年第5期24卷 447-462页

作者： Jianwen Liang Jia Fu Department of Civil Engineering Tianjin University Tianjin 300072 China

A closed-form analytical solution of surface motion of a semi-elliptical cylindrical hill for incident plane sh waves is presented. Although some previous analytical work had already dealt with hill topography of semi-circular and shallow circular, our work aims at calculating surface motion of very prolate hill for high incident frequency, and explaining the special vibrating is checked by boundary conditions, numerical results for and some conclusions are obtained. properties of very prolate hill. Accuracy of the solution surface motion of oblate and prolate hills are calculated,

关键词： semi-elliptical hill analytical solution plane sh wave surface motion oblate hill prolate hill Mathieu function high frequency

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