中等膨胀土边坡稳定性分析与抗剪强度参数选择探讨  

Discussion on stability analysis of slope in medium expansive soil area and selection of shear strength parameters

作　　者：张迪 ZHANG Di(Nanyang Yaguan Water Conservancy Project Maintenance Co.,Ltd.,Nanyang 473000,China)

机构地区：[1]南阳市鸭灌水利工程维修养护有限公司,河南南阳473000

出　　处：《水利水电快报》2022年第9期73-76,共4页Express Water Resources & Hydropower Information

摘　　要：为准确计算中等膨胀土边坡抗剪强度、选择合理的计算参数以保证结果精度,运用文献综述法、对比法、图解法、数学模型法等,对边坡坡角、边坡系数、抗剪强度等进行了计算和研究。采用力学分析法,计算了各滑坡体极限平衡状态下抗剪强度边界值,建立直角坐标系,得出中等膨胀土区各滑坡体的线性方程。结果表明:抗剪强度在K线以上的土坡是稳定的,K线及其以下的土坡不稳定。对于已滑边坡的室内抗剪强度试验值,如果落在K线以上,则试验值不符合实际;如果落在K线及其以下,则试验值符合实际。抗剪强度相关参数的确定不能仅依靠图解法或者计算获得,还应根据不同工程的土坡现场条件具体分析,做出科学设计以保证土坡的稳定性。In order to calculate the shear strength of landslide in expansive soil area accurately and select the correct calculation parameters to ensure the accuracy of the results, the slope angle, slope coefficient and shear strength were calculated and studied by using literature review, comparison method, graphic method and mathematical model method.On the basis of the mechanical analysis, the boundary value of shear strength of each landslide mass under the limit equilibrium state was calculated, the rectangular coordinate system was established, and the linear equation of each landslide mass in medium expansive soil area was obtained.The results showed that the soil slope with shear strength above the K line was stable, and the soil slope on or below the K line was unstable.For the laboratory shear strength value of the sliding slope, the test value is not in line with the reality if it falls above the K line;the test value is in line with the actual situation if it is on or below the K line.The related parameters determination of shear strength cannot be obtained only by graphical method or calculation and they should be analyzed with the site conditions of soil slopes of different projects, so as to make scientific design to ensure the stability of soil slopes.

关 键 词：土坡稳定性 中等膨胀土 抗剪强度 边坡坡角 边坡系数 

分 类 号：TV43[水利工程—水工结构工程]