基于裂隙描述的膨胀土堑坡稳定性分析  

Stability analysis of cut slope of expansive soil based on fissure description

作　　者：李雄威[1] 代国忠[1] 于常瑶[1] 王继果[2] 

机构地区：[1]常州工学院常州市建设工程结构与材料性能研究重点实验室,江苏常州213002 [2]三江学院土木工程学院,江苏南京210012

出　　处：《岩土工程学报》2013年第6期1069-1075,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41102229);住房和城乡建设部科学技术项目(2012-k3-10);江苏省"青蓝工程"资助项目

摘　　要：以广西白色强膨胀土为研究对象,利用MATLAB软件编制程序对土体裂隙图片进行二值化处理,获得裂隙率与含水率的线性回归关系。现场试验观测表明,雨季前裂隙长期平均宽度0.005 m,利用等效模型,获得表层土体含水率与裂隙间距的相关关系。按照雨水在裂隙中渗流的过程建立裂隙影响下的雨水入渗计算模型,利用不同裂隙间距,来描述裂隙分布。基于裂隙描述的雨水入渗膨胀土堑坡稳定性计算结果表明,是否考虑裂隙对膨胀土边坡稳定性的计算结果影响较大。当裂隙率较高时边坡持续降雨后安全系数会大幅度降低,同时边坡大气剧烈影响深度的加深也会引起安全系数的迅速降低。根据研究结果,对膨胀土边坡治理提出了具体建议。For the white strong expansive soil in Guangxi Zhuang Autonomous Region of China, by using the MATLAB software programming for binary processing of soil fissure images, a linear regression relationship between fissure ratio and water content is obtained. Field test observations show that the long-term average width of fissure is about 0.005 m before the rainy season. The correlation of the water content of surface soil and fracture spacing is obtained by means of the equivalent model. Using different fracture spacings, the fracture distribution is represented according to rainfall infiltration model in fracture seepage. Based on the description of fissures, it is shown that the calculated results of stability of cut slope with infiltration are deeply influenced by fissures. The safety factor of the slope decreases greatly with sustained rainfall when the fissure ratio is high, and it also greatly decreases with the development of the atmospheric drastic influence depth. According to the research results, some specific proposals are put forward for the cut slope of expansive soil.

关 键 词：膨胀土 堑坡 裂隙 大气作用 稳定性分析 

分 类 号：TU475.5[建筑科学—结构工程]