摘要
本文提出一种能够全面考虑应力、应变、振动孔隙水压力、震陷以及桩土界面规律的上体动力计算模型，并将该模型与Ｂｉｏｔ两相介质动力固结方程相结合，建立了拉基震陷的有效应力动力计算方法。液化砂土地基上典型高层建筑的拉基震陷计算发现：地基液化可以使柱产生较大的震陷，地震期间桩基的瞬时沉降较小，震陷的主要发展阶段是在地震结束以后的一段时间。
A dynamic soil model is proposed in this paper. The stress-strain relationships, pore water pressure, seismic subsidence and pile-soil interface are taken into account in the model. In combination with Biot's dynamic consolidation theory, which describes the dynamic interaction of two-phase porous media system, the dynamic analysis of effective stress is conducted to predict the seismic subsidence of pile foundations. The model is utilized to calculate the seismic subsidence of a typical tall building's pile foundation on liquefied soils. Numerical results show that soil liquefaction can lead to large seismic subsidence of pile foundations. It is also found that the transient subsidence of pile foundations is small during earthquakes and the main seismic subsidence is developed for a period after earthquakes.
出处
《工程力学》
EI
CSCD
北大核心
2001年第4期123-129,共7页
Engineering Mechanics
基金
上海市建设技术发展基金科研项目(A9206134-1)
关键词
地震
桩
震陷
有效应力
动力固结
earthquake
pile
seismic subsidence
effective stress
dynamic consolidation
