海底边坡稳定分析方法综述

本文指出海底边坡与陆上边坡的不同点,对一个完整的海底边坡稳定问题从几何形状和载荷情况两个方面进行了描述。由于波浪影响是海底边坡问题的最大特点,因此回顾了计算海底压力的各种方法以及在海底压力作用下海底土层产生的瞬态和残余孔隙压力。然后对极限平衡、静态变形分析和动力分析三大类边坡稳定分析方法进行了评述,并指出各自的适用范围。海底边坡破坏后的行为尤其复杂,指出用流变模型预测泥流性质的可能性。最后提出了海底边坡稳定性课题的当前致力方向。

STATE OF THE ART: ANALYTICAL METHODS OF SUBMARINE SLOPE STABILITY

The differences between the submarine slope stability problems and those on land are pointed out first, and the marine slope stability analysis is then described in detail with respect to geometry and loading. Since the wave effect is the most important feature of the submarine slope, different methods for calculating the wave induced bottom pressures as well as the cyclic response of the seabed, including both transient and residual pore pressures, are reviewed. Three different methods for stability analysis, i.e. limit equilibrium analysis, static deformation analysis and dynamic analysis,and their respective applications are discussed. The post failure behaviour of the submarine slope is especially complicated,so the possibility of using the rheological model to predict the flow properties is indicated. Finally, some research projects on this subject are proposed.