受水压振荡时饱和砂床的液化与变形特性  

LIQUEFACTION AND DISPLACEMENT OF SATURATED SAND UNDER WATER PRESSURE OSCILLATION

作　　者：鲁晓兵[1] 张金来[1] 王义华[1] 王淑云[1] 崔鹏[2] 

机构地区：[1]中国科学院力学研究所,北京100080 [2]中国科学院成都山地灾害与环境研究所,成都610041

出　　处：《岩石力学与工程学报》2004年第19期3324-3329,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学杰出青年基金(40025103);中国自然科学基金(10202024)

摘　　要：为考察饱和砂土地基受到水压振荡作用时的动力响应,根据两相连续介质理论,分析了液化发展、液化区厚度、颗粒速度等。研究结果表明,随着土强度和渗透性的降低与载荷强度的增加,液化发展速率加快;随着土强度的降低和渗透性、载荷强度的增加,变形量增加;如果土的初始分布不均匀,则在渗透性小的位置,应变和孔隙水压力将剧烈变化,这可以解释为什么在一定条件下土中会出现断裂和水层。In order to investigate the influence of vertical water pressure oscillation on the liquefaction of saturated sand, one dimensional side-constrained model of saturated sand is presented based on biphase continuous media theory. The development of liquefaction and the liquefaction thickness are analyzed. It is shown that the developing rate of liquefaction increases with the increment of load and the decrement of sand strength or the permeability, but the deformation of sand increases with the decrement of sand strength and increment of permeability and load. If the permeability of sand is homogeneous, the pore pressure and the strain rise sharply near the place with the smallest permeability. This solution may explain why the fracture occurs in the sand column in some conditions. With the development of liquefaction, the strength of the soil foundation becomes smaller and smaller. The foundation will slide or flow when the limited state arrives. That means, landslides or debris flow will occur.

关 键 词：土力学 水压振动 断裂 液化 

分 类 号：TU472.2[建筑科学—结构工程]