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针对山区修筑公路常遇开挖自然斜坡坡脚而诱发边坡失稳的情况,对某边坡的粘土进行卸荷路径下的三轴试验,以获得边坡稳定分析的计算参数。用这些参数对开挖边坡作非线性有限元分析,可获得边坡塑性区形态和确定滑移面位置。现场监测边坡在渗流期的地下水位变化,采用极限平衡法计算边坡的安全系数,并对其稳定性进行评价。研究认为边坡的危险期是汛期,宜采用有效应力法估算其稳定。
In view of the situation of slope instability induced by the excavation of the slope of the natural slope in the mountainous highway construction, the triaxial test of the clay under the unloading path is carried out to obtain the calculation parameters of slope stability analysis. Nonlinear finite element analysis of the excavated slope with these parameters can be used to obtain the shape of the plastic zone of the slope and determine the position of the slip surface. The on-site monitoring of groundwater table during the seepage period changes, using the limit equilibrium method to calculate the safety factor of the slope, and evaluate the stability. According to the research, the dangerous period of slope is flood season, and the effective stress method should be used to estimate its stability.