高液限土边坡稳定性影响因素的敏感性研究  

Sensitivity Studies on Factors Influencing Stability of High Liquid Limit Soil Slope

作　　者：刘顺青[1,2] 洪宝宁[1,2] 徐奋强[3] 程涛[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098 [3]南京工程学院建筑工程学院,南京211167

出　　处：《防灾减灾工程学报》2014年第5期589-596,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51079052);广东省交通科技项目(200903005)资助

摘　　要：为了研究高液限土边坡稳定性各影响因素的敏感性,以分布在广梧高速公路沿线边坡中的高液限土为试样,通过常规直接剪切试验测定了不同含水状态下高液限土的抗剪强度参数,并以此为基础,基于强度折减法计算研究了高液限土边坡的含水率、剪胀角、坡高等7个因素对边坡稳定性安全系数的影响。计算结果表明:高液限土边坡稳定性各影响因素的敏感性,从大到小依次是高液限土边坡的含水率、坡度、坡高,而高液限土边坡的弹性模量、泊松比、剪胀角以及抗拉强度对边坡稳定性的影响不显著;当高液限土边坡的含水率增加到某值时,边坡稳定性安全系数会突然减小,容易引发滑坡;高液限土边坡坡度、坡高与边坡稳定性安全系数的关系曲线,分别呈下降的直线型及微向上凹的抛物线下降型。研究成果为高液限土边坡的设计、施工以及处治提供了理论依据,具有一定的实际意义。In order to study the sensitivity of factors which influence the stability of high liquid limit soil slope,the shear strength parameters under different water content of high liquid limit soil taken from slopes of Guang-Wu Expressway were measured by direct shear test,and strength reduction method was employed to study the sensitivity of stability of high liquid limit soil slope to the seven influencing factors including water content,slope degree,slope height and so on. The results of calculation indicate that the stability sensitivity of high liquid limit soil slope to influencing factors ranges from the large to small as follows： water content,slope degree,and slope height. The elastic modulus,poisson＇s ratio,dilatancy angle,and the tensile strength have less impact on the stability of high liquid limit soil slope. When the water content comes to a certain value,the safety factor of a high liquid limit soil slope sharply decreases.In this case,the landslide will be easy to happen. The safety factor versus slope degree curve of high liquid limit soil slope has a straight line downward trend. But the safety factor versus slope height curve of high liquid limit soil slope shows a slightly upward concave parabola type of downward trend. The research results provide theoretical references for the design,construction and treatment of high liquid limit soil slopes.

关 键 词：高液限土边坡 含水率 敏感性研究 直剪试验 强度折减法 

分 类 号：TU411.2[建筑科学—岩土工程]