考虑裂隙影响的红黏土边坡浅层稳定性分析

1.河西学院土木工程学院,甘肃 张掖 734000;2.江苏科技大学 土木工程与建筑学院,江苏 镇江 212100

红黏土边坡;含水率;浅层稳定性;裂隙;大气影响深度

Shallow Stability Analysis of Red Clay Slope Considering the Influence of Fissure
HUANG Lihua1,LIU Shunqing2

1.School of Civil Engineering , Hexi University , Zhangye 734000, China;2.School of Architecture and Civil Engineering , Jiangsu University of Science and Technology , Zhenjiang 212100, China

Red clay slope;Water content;Shallow stability;Fissure;Atmospheric influence depth

DOI: 10.13512/j.hndz.2022.02.14

备注

通过室内直剪试验获取了现场含水率变化范围内坡体红黏土的抗剪强度及残余抗剪强度参数,同时采用湿度系数结合现场探槽试验以及裂隙的统计资料综合确定了红黏土边坡的裂隙开展深度,以此为基础采用二维有限元分析软件MidasSoilworks分析了考虑裂隙影响的红黏土边坡的浅层稳定性,并将计算结果与不考虑裂隙时进行了对比。结果表明:红黏土边坡在考虑裂隙影响时滑动面随含水率增大逐渐从深层向浅层转变,并最终处于裂隙开展深度范围内;红黏土边坡的浅层安全系数在坡体饱和之前,下降最为明显;与不考虑裂隙的红黏土边坡相比,浅层稳定安全系数的绝对衰减率在20.4%~32.0%变化。
The shear strength and residual shear strength parameters under different water contents of red clay are measured by direct shear tests. The depth of fissure of red clay slope is determined by using humidity coefficient, field grooving test and statistical data of fissures. The shallow stability of red clay slope considering the influence of fissure is analyzed by using the two-dimensional finite element analysis software Midas Soilworks. The computing results are compared with the shallow safety factor without considering fissures. The computing results indicate that the sliding surfaces of red clay slopes gradually change from deep to shallow with the increase of water contents, and finally the sliding surface is in the range of the depth of fissure. The shallow safety factor of the red clay slope is the most obvious before the saturation of the red clay. Compared with the red clay slopes without fissures, the absolute attenuation rate of the shallow safety factor is between 20.4% and 32.0%.
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