Comparative analysis on spatiotemporal pore pressure evolution under surface-wave perturbations

作者:Zhang, Y (Zhang, Yu)^{[ 1,2,3 ]} ; Ping, P (Ping, Ping)^{[ 4 ]} ; Zhang, SX (Zhang, Shuangxi)^{[ 1,2,3 ]} ; Deng, P (Deng, Pan)^{[ 5 ]}

SOIL DYNAMICS AND EARTHQUAKE ENGINEERING

DOI: 10.1016/j.soildyn.2016.10.032

出版年: JAN 2017

The near surface spatiotemporal pore pressure fluctuations in a porous half space induced by seismic surface wave perturbations in different poroelastic regimes are analytically compared. The results for the pore pressure in the space-time domain are derived by inverse transforms of the fundamental solutions of dynamic poroelasticity in the frequency-wavenumber domain. Different poroelastic regimes depend on the different low frequency approximation for Biot's multi wave mode physical behaviors. In low seismic frequency band, whereas the fast wave mode inference can generate surface wave along the interface, fluid pressure is also significantly perturbated as in solid phase, but behaves as a slow P2 mode reflected by the R surface wave. It is also shown that the amount of induced pore pressure fluctuations are different by P2 diffusivity (dispersion-difusivity regime, DD and non-dispersion-diffusivity regime, NDD) and P2 wave (full-wave regime, FW). The strong solid and fluid coupling on the interface generates the transferred RP2 mode. Therefore, the decoupled viscoleastic approximation (VA) does not represent these near surface fluid characteristics. The results can be applied to predict near surface pore pressure responses under seismic perturbations, or as a benchmark for other numerical approaches for pressure solutions in a dynamic poroelastic half space, and also favor a potential interpretation for near surface soil liquefaction failure.

作者关键词:Pore pressure; Surface wave; Poroelasticity; Diffusivity; Seismic oscillation

KeyWords Plus:SATURATED POROUS-MEDIA; FLUID; LIQUEFACTION; PROPAGATION; EXTRACTION; FREQUENCY;STORAGE

通讯作者地址: Zhang, Y (通讯作者)

通讯作者地址: Ping, P (通讯作者)

地址:

电子邮件地址:yuz124@gmail.com; ppingapple@gmail.com; shxzhang@sgg.whu.edu.cn

ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

研究方向:Engineering; Geology

Web of Science 类别:Engineering, Geological; Geosciences, Multidisciplinary

文献类型:Article

语种:English

入藏号: WOS:000391077300048

ISSN: 0267-7261

eISSN: 1879-341X

Impact Factor (影响因子):1.481