基于重度增加法的边坡稳定性三维有限元分析  

3-D FEM Analysis of Slope Stability Based on Gravity Increase Method

作　　者：康亚明[1] 杨明成[1] 胡艳香[1] 任克峰[1] 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《建筑科学与工程学报》2006年第4期49-53,共5页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50568003);教育部科学技术研究重点项目(205174)

摘　　要：提出了分析边坡稳定性的三维非线性有限元重度增加法。利用ANSYS软件,基于D-P准则,考虑了关联的流动法则,先保持土体强度指标粘聚力和内摩擦角不变,通过逐步增加重度的方法使土体达到临界状态,采用坡顶水平位移与重度增加系数关系曲线上位移陡然增大作为边坡的破坏标准。充分考虑了土体的空间作用机制和变形协调机制,通过计算得到可能的半球形或复合形滑动面的位置和形式,而不是事先去假定,得到的安全系数也与其他方法相近。该方法可以更好地模拟土坡的破坏,有助于了解土坡的破坏机理,其结果对工程实践具有指导作用。A new stability analysis method, 3-D nonlinear finite element gravity increase method was developed by ANSYS software, in which associated flow rule was employed while D-P criterion was used as the yield function. The principle of this method is keeping the cohesion and inner friction angle for constant, then, carrying on the analysis again and again until the slope attains critical break appearance through increasing the gravity acceleration gradually. The failure criterion was defined to be corresponding to the jump point in the curve relating the computed displacement of the slope top to the gravity increase factor. This method fully takes into account the spatial action mechanism and cooperative deformation mechanism of soil. By using the proposed method, the possible shape or location of sliding for a semispherical failure surface or a composite failure is a part of the analytical solution, rather than assumption in advance, and this method generates safety factors comparable to those obtained by using other existing methods. It is found that the method can properly simulate the destruction of slope and it is conductive to comprehend the destructive principle of the slope. The result plays the directive guide function to project practice.

关 键 词：三维非线性有限元 安全系数 边坡稳定性 重度增加法 

分 类 号：TU457[建筑科学—岩土工程]