膨胀土路基边坡等厚式封面层稳定性计算方法研究  

STABILITY STUDY OF VENEER COVER SOIL ON THE SLOPE OF EXPANSIVE SOIL SUBGRADE

作　　者：何漓江[1] 刘祖德[2] 

机构地区：[1]华中科技大学土木工程学院,武汉430074 [2]武汉大学土木与建筑工程学院,武汉430070

出　　处：《岩石力学与工程学报》2001年第3期382-385,共4页Chinese Journal of Rock Mechanics and Engineering

摘　　要：对膨胀土路基边坡进行封面处理 ,是保证边坡稳定工作的常用工程措施之一。由于封面土与膨胀土路堤间的界面成为整个路堤的薄弱环节 ,由此会导致封面土本身产生稳定性丧失问题 ,需要对封面土层进行稳定性计算分析。对于等厚式封面土层 ,目前常用的分析方法均是根据无限长平行坡的假设来进行的 ,但实际路基边坡是有限长的 ,这种方法所假定的滑动面与实际不符。按笔者通过实验所得的滑动面位置 ,对膨胀土路基边坡等厚式封面土层的稳定性计算公式进行了推导 。Putting veneer cover soil on the slope of expansive soil subgrade is a method to prevent the failure of expansive soil subgrade. But the interface between the veneer cover soil and the subgrade becomes a new weak point to whole subgrade. This leads to another stability problem of veneer cover soil itself. To analyse the stability of veneer cover soil of equal thickness, the most commonly used methods are based on the assumption that slopes are infinite in length. But the practical slopes of subgrade are finite in length. Through laboratory testing study, it is found that the actual sliding surface occurs in veneer cover soil on finite slope, which is different from the results commonly used methods mentioned above. According to the actual sliding surface from laboratory testing study, a new formula is developed to determine the stability factor of veneer cover soil on the slope of expansive soil subgrade.

关 键 词：封面 膨胀土 边坡 稳定性系数 土工膜 路基 

分 类 号：U416.1[交通运输工程—道路与铁道工程]