波浪作用下海床土体的孔隙水压累积响应  

Wave-Induced Pore Pressure Accumulation in Porous Seabed

作　　者：李小均[1] 高福平[1] 鄢文杰[1] 吴应湘[1] 

机构地区：[1]中国科学院力学研究所水动力学与海洋工程重点实验室,北京100190

出　　处：《中国造船》2009年第A11期293-299,共7页Shipbuilding of China

基　　金：国家自然科学基金项目（10872198）

摘　　要：提出了一种模拟波浪作用下海床土体动态孔隙水压累积响应的有限元模型，与Clukey et a1．（1983）的波浪水槽实验结果进行了验证分析。通过算例，研究了海床土层厚度对孔隙水压累积速率和残余孔压幅值，以及累积液化深度的影响。结果表明，累积液化深度随海床厚度的增大而逐步增加；当土体厚度接近一个波长时，液化深度趋于无限厚度海床液化深度的理论值。A FEM model is proposed to simulate the wave-induced pore pressure accumulation in the porous seabed with finite thickness, which is verified with the existing experimental data. The effects of soil thickness on the pore-pressure accumulation rate, residual pressure amplitude and the liquefaction depth are investigated numerically. It is indicated that the depth of accumulative liquefaction increases with increasing seabed thickness. As the thickness of porous seabed approaches to approximately one wave-length, the liquefaction depth is equivalent to the value of analytical solution for the seabed with infinite thickness.

关 键 词：波浪荷载 累积孔压 液化深度 数值模拟 

分 类 号：P542.3[天文地球—构造地质学] TU441.8[天文地球—地质学]