水泥搅拌桩加固坝基动力响应分析

Dynamic Response Analysis of Foundation with Cement Mixing Piles of a Dam

以 Biot固结方程为基础 ,采用有效应力法对水泥搅拌桩复合地基及细砂土层进行动力响应及液化分析。该法考虑了阻尼等因素的影响 ,将应力、位移及孔压等量耦合于 Biot固结方程之中 ,从而可以计算地震期间的孔隙水压力、速度、正应力及剪应力的发展全过程 ,并探讨了上覆荷载、水泥搅拌桩桩长、置换率等因素对场地动力响应及液化的影响 ,对地基抗震设计及研究具有一定的指导意义。

Biot-consolidation equation is applied to study the dynamic response and the liquefaction of composite foundation with cement mixing piles under dynamic loading by the effective stress method. The effect of damping is considered and stress, displacement and pore-water pressure are coupled in the Biot-consolidation equation. Therefore, it can be used to calculate the development of the pore-water pressure, velocity, acceleration, normal stress and shear stress in soil during the earthquake. It also can be used to discuss the effects of static load, the length of cement mixing piles, the replacement rate on the dynamic response of foundation and liquefaction. So it is constructive the aseismatic design and analysis of foundation.