摘要
基于D-P准则,采用关联流动法则,用非线性有限元重度增加法对一非均质不规则公路边坡进行了分析。其原理是保持粘聚力c及内摩擦角φ不变,通过逐步增加土体重度的方法使土体达到临界状态。采用坡顶水平位移随重度增加系数变化的关系曲线上位移陡然增大作为边破的破坏标准。有限元重度增加法事先无须对滑动面的位置和形式做出任何假定,同时考虑了土体的材料非线性和几何非线性,因此利用二维有限元重度法能更好地模拟土坡的破坏,有助于了解土坡的破坏机理。其结果不仅对工程实践具有指导作用,而且对研究土体的破坏机理,探索分析边坡稳定的适用计算方法都有现实意义。用重度增加法得到的安全系数与传统方法的误差在9%左右,因此重度增加法可以用于边坡稳定分析。
In this paper, stability of an inhomogeneous and irregular highway slope was analyzed using the non-linear finite element with Gravity Increase Method （GIM） by ANSYS software, in which the associated flow rule is employed, D-P criterion is used as the yield function. The principle of GIM is keeping the cohesion c and friction angle （ for constant, then carry on the analysis again and again until the slope attain critical break appearance through increasing the gravity acceleration G gradually. The failure criterion is defined to be corresponding to the jump point in the curve relating the computed displacement of the slope top to the gravity increase factor. No assumption needs to be made in advance about the shape or location of the failure surface ： The analytical results show that not only the nonlinearity of soil material but also the geometric nonlinearity in the process of failure is considered. It is found that the 2-D FE GIM can properly simulate the slope failure and it is conducive to comprehend the failure mechanism of the slope. Its result not only plays the directive function to engineering practice, but also of current significance in studying the failure mechanism of the slope and probing proper computing methods of slope stability. The average error of the factor of safety obtained by GIM and by traditional methods is about 9 %, thus, the GIM can be used for stability analysis of the slope.
出处
《中国地质灾害与防治学报》
CSCD
2006年第3期154-157,共4页
The Chinese Journal of Geological Hazard and Control
基金
国家自然基金资助项目(50568003)
教育部科学技术研究重点项目(205174)
关键词
非线性有限元
安全系数
边坡稳定性
重度增加法
non-linear finite element
factor of safety
slope stability
gravity increase method
