膨胀土路基边坡等厚式封面层稳定性实验研究

对膨胀土路基边坡进行封面是一种保证其正常使用的工程措施 .但封面土与膨胀土路堤间的界面又变为整个路堤的薄弱环节 ,导致了封面土本身的稳定性问题 .对于等厚式封面土层 ,目前常用无限长的平行坡方法进行稳定性分析 .但路基边坡是有限长的 ,这些方法所假定的滑动面与实际不符 .笔者通过实验研究发现 ,有限长边坡的实际滑动面位置与无限长的平行坡方法所假定的滑动面不同 .按实验所得的滑动面位置 ,推导出计算膨胀土路基边坡等厚式封面土层稳定性系数的公式 .最后 ,得出一些结论

Laboratory study on stability of veneer cover soil on the slope of expansive soil subgrade

Use of veneer cover soil on the side slope of expansive soil subgrade is a method to prevent early failure of expansive soil subgrade.But the interface between the veneer cover soil and the subgrade becomes a new weak point to the whole subgrade.That leads to another stability problem of veneer cover soil its own.To the problem of analyzing the stability of veneer cover soil of equal thickness,the most commonly used methods are based on the assumption that slopes were infinite in length.But the side slopes of subgrade are finite in length,so these methods may not be suitable to be used in that case.Through laboratory study,it is found that the actual sliding surface occurred in veneer cover soil on finite slope is different from that of commonly used methods mentioned above.According to the actual sliding surface from laboratory study,this paper develops a new formula for calculating the stability factor of veneer cover soil on the side slope of expansive soil suograde.In the end,some conclusions are also presented.