膨胀土斜坡地基路堤失稳破坏有限元极限分析

Limit analysis of subgrade filling failure on expansive clay slope foundation with finite element method

膨胀土斜坡地基上进行路堤填筑时,由于膨胀土层遇水后强度极度降低,极易形成软弱夹层,造成路堤沿坡体倾斜方向整体滑动甚至垮塌。采用有限元极限分析方法对一般斜坡地基上路堤和易于产生软弱夹层的膨胀土斜坡地基路堤进行稳定性分析。结果表明:采用有限元强度折减法,不需任何假设,即能得出路堤的稳定安全系数和滑动面,是进行膨胀土斜坡地基上路堤稳定性评价的有效方法,适于在复杂地质条件下路堤稳定性分析中推广应用。

The subgrade reclamation on expansive clay slope foundation,because of the strength of expansive soil down under water,will become weak intercalation easily and make the whole embankment slide even slumping along slope.The stability of subgrade on general slope foundation and easily coming into weak intercalation is analyzed by finite element method.The result shows that the stability safety factor and sliding surface of the subgrade can be obtained with the strength reduction finite element method without any hypothesis.And also it is an effective method to analyze stability of subgrade on the complicated slope foundation.It is a method deserving popularizing for analyzing stability of subgrades under complicate geologic conditions.