Amplification of in-plane seismic ground motion by group cavities in layered half-space (II): with saturated poroelastic soil layers
Jianwen Liang1, 2, Ji Zhang1, 2, Zhenning Ba1, 2
1 Department of Civil Engineering, Tianjin University, Tianjin 300072, China 2 Tianjin Key Laboratory of Civil Engineering Structures and New Materials, Tianjin 300072, China
Amplification of in-plane seismic ground motion by group cavities in layered half-space (II): with saturated poroelastic soil layers
Jianwen Liang1, 2, Ji Zhang1, 2, Zhenning Ba1, 2
1 Department of Civil Engineering, Tianjin University, Tianjin 300072, China 2 Tianjin Key Laboratory of Civil Engineering Structures and New Materials, Tianjin 300072, China
摘要As the continuation study on amplification of in-plane seismic ground motion by underground group cavities in layered half-space, this study extends to the case of poroelastic half-space with dry poroelastic and saturated poroelastic soil layers. The influence of poroelastic layers on the amplification of seismic ground motion is studied both in frequency domain and time domain using indirect boundary element method (IBEM). It is shown that for the example of a saturated poroelastic site in Tianjin under the excitation of Taft wave and El Centro wave, the amplification of seismic ground motion in poroelastic case is slightly smaller than that in the elastic case, and the amplification of PGA (peak ground acceleration) and its PRS (peak response spectrum) can be increased up to 38.8% and 64.6%; the predominant period of response spectra in poroelastic case becomes shorter to some extent compared with that in the elastic case. It is suggested that the effect of underground group cavities in poroelastic half-space on design seismic ground motion should be considered.
Abstract：As the continuation study on amplification of in-plane seismic ground motion by underground group cavities in layered half-space, this study extends to the case of poroelastic half-space with dry poroelastic and saturated poroelastic soil layers. The influence of poroelastic layers on the amplification of seismic ground motion is studied both in frequency domain and time domain using indirect boundary element method (IBEM). It is shown that for the example of a saturated poroelastic site in Tianjin under the excitation of Taft wave and El Centro wave, the amplification of seismic ground motion in poroelastic case is slightly smaller than that in the elastic case, and the amplification of PGA (peak ground acceleration) and its PRS (peak response spectrum) can be increased up to 38.8% and 64.6%; the predominant period of response spectra in poroelastic case becomes shorter to some extent compared with that in the elastic case. It is suggested that the effect of underground group cavities in poroelastic half-space on design seismic ground motion should be considered.
基金资助:National Natural Science Foundation of China under grant No. 50978183 and Key Project for Applied Basic Research of Tianjin Municipality under Grant No. 12JCZDJC29000
通讯作者:
Jianwen Liang
E-mail: liang@tju.edu.cn
引用本文:
Jianwen Liang, Ji Zhang, Zhenning Ba. Amplification of in-plane seismic ground motion by group cavities in layered half-space (II): with saturated poroelastic soil layers[J]. 《地震学报》英文版, 2012, 25(4): 287-298.
Jianwen Liang, Ji Zhang, Zhenning Ba. Amplification of in-plane seismic ground motion by group cavities in layered half-space (II): with saturated poroelastic soil layers. Earthquake Science, 2012, 25(4): 287-298.
