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Seismic analysis of underground tunnels subjected to 3d oblique incident P and SV waves by 2.5d approach

Underground Space 2023年第5期12卷 271-286页

作者： Yeong-Bin Yang Xiaoli Wang Zeyang Zhou Xiongfei Zhang Zhi Li School of Civil Engineering Chongqing UniversityChongqing 400045China School of Civil Engineering and Architecture Chongqing University of Science and TechnologyChongqing 401331China

This paper presents,for the first time,the consideration of three-dimensional(3d)oblique incident P and SV waves in calculating the 3d seismic response of a lined tunnel embedded in a half-space by the 2.5d finite/infinite element method(FIEM).Firstly,the applicability of the 2.5d FIEM for 3d seismic analysis is *** the exact solutions obtained for the free field in the Appendix,the equivalent seismic forces are rationally computed for the near-field boundary,considering the horizontal and vertical excitations of the Chi-Chi *** performing seismic analysis of the half space embedded with a tunnel using the 2.5d FIEM,the time-domain responses of the tunnel are *** accuracy of the present solutions is verified against those of de Barros and *** drawn from the parametric study include:(1)Stress concentration for the principal stress under oblique incident seismic waves occurs at the polar angles of 0(vault),90,180(inverted arch),and 270of the lining wall.(2)The vault and inverted arch are the weakest parts of the tunnel during earthquakes.(3)The accelerations of the tunnel during earthquakes can be regarded as of the rigid body type.(4)The responses of the tunnel lining caused by SV waves of an earthquake are much more critical than those by P waves.(5)For arbitrary seismic waves,the maximum longitudinal acceleration azmax is of the same order of magnitude as the maximum horizontal acceleration axmax.

关键词： Earthquake Finite/infinite element method 3d oblique incident waves Time domain response Tunnel 2.5d approach

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2.5-dimension soil seismic response to oblique incident waves based on exact free-field solution

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Frontiers of Structural and Civil Engineering 2024年第2期18卷 216-235页

作者： Yeongbin Yang Zeyang Zhou Xiaoli Wang Xiongfei Zhang Zhilu Wang School of Civil Engineering Chongqing UniversityChongqing 400045China School of Civil Engineering and Architecture Chongqing University of Science and TechnologyChongqing 401331China

With the three dimensional(3d)oblique incident waves exactly determined for the free field,the soil seismic responses in both frequency and time domains are studied by the 2.5 dimension(2.5d)finite/infinite element ***,the free-field responses in frequency domain are solved exactly for 3d arbitrary incident P and SV waves,which requires no coordinate conversion or extra effort for SV waves with super-critical incident ***,the earthquake spectra are incorporated by the concept of equivalent seismic forces on the near-field boundary,based only on the displacements input derived for unit ground accelerations of each frequency using the 2.5d *** the asymmetric 2.5d finite/infinite element model adopted,the procedure for soil seismic analysis is *** solutions computed by the proposed method are verified against those of Wolf’s and de Barros and Luco’s and for inversely calculated ground *** interest is that abrupt variation in soil response occurs around the critical angle on the wave propagation plane for SV *** addition,the horizontal displacements attenuate with increasing horizontal incident angle,while the longitudinal ones increase inversely for 3d incident P and SV waves.

关键词： 3d oblique incident wave seismic response analysis 2.5d approach infinite element half-space

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