昆明地区土质高边坡稳定性分析

结合昆明国道东连接线支线工程的土质边坡设计,通过工程沿线的工程地质调查,对土质边坡稳定坡高与坡角的相关关系进行了回归分析。采用基于传统的简化毕肖普圆弧滑动面法,根据地质勘察资料确定了计算参数,对典型的一级、二级和三级边坡的稳定系数进行了计算。采用FLAC数值模拟技术,根据现场勘察及直剪试验的结果,确定了各土层的计算参数,采用平面应变力学模型,对工程中高路堑边坡实际断面的整个边坡区域进行了数值模拟计算。计算分析结果表明,FLAC数值模拟与简化毕肖普法的计算结果相吻合,对于土质边坡,坡率对边坡稳定性的影响远大于坡高对边坡稳定性的影响。

Analysis of Stability of Soil of High Side Slopes in Kunming Area

IIn combination with soil side slope design of branch project of eastern connection road of Kunming National Highway and through surveying the project geology along the project, the paper makes regression analysis of the relative relation of soil side slope stable slope height with slope angle. It determines the calculation parameters in accordance with geological survey data by the traditional simplified Bishop arc movable surface method and make the calculation of stable coefficients of the typical Grade I, Grade II and Grade III side slopes. It also determines the calculation parameters of every soil layer by FLAC value simulation technology in accordance with the site survey and the result of direct shear test so as to calculate the value simulation of the whole side slope area of the actual section of high road trench in the project by using plan strain mechanical model. The calculated results show that FLAC value simulation is identical with the calculated result of Bishop's simplified method. For the soil side slope the influence of the slope rate on side slope stability is greater that the influence of slope height on side slope stability.