基于参数反分析的边坡加固设计研究

Research on Slope Reinforcement Design Based on Parameter Back Analysis

采用反分析的方法确定已失稳边坡的现状参数具有效率高,准确性好的优点。以某高速公路左侧一典型路堑边坡为例,首先分析现状边坡的失稳破坏模式,在此基础上确定反分析计算的目标稳定性系数和工况。然后通过极限平衡参数反分析获取边坡岩土体现状强度参数值。最终计算满足各工况要求的最大边坡加固力,给出边坡加固方案,并采用有限元进行了验证。得到如下结论:1) 经过反分析计算,得到边坡岩土体饱和参数为内摩擦角φ等于13˚,粘聚力c为15 kPa;2) 在降雨 + 自重条件下边坡所需加固力最大。边坡加固采用减缓坡比以及边坡中部布置钢筋混凝土抗滑桩的方式,并且在边界外设置截排水沟。

Using the back analysis method to determine the status of the unstable slope parameters has the advantages of high efficiency and good accuracy. Taking a typical cut slope on the left side of a highway as an example, the failure mode of the current slope is analyzed at first, and then the target stability coefficient and working condition calculated by back analysis are determined on this basis. Then through the limit equilibrium parameter back analysis to obtain the slope rock and soil embodiment strength parameter value. Finally, the maximum slope strengthening force satisfying the requirements of each working condition is calculated, and the slope strengthening scheme is given, which was classified by the finite element method. The results are as follows: 1) After back analysis and calculation, the saturation parameter of slope rock mass includes: internal friction Angle is 13˚, and the cohesive force c is 15 kPa;2) Under the condition of rainfall + dead weight, the slope needs the greatest reinforcement force. The slope is strengthened by reducing slope ratio and laying reinforced concrete anti-slide piles in the middle of the slope, and the drainage ditch is set outside the boundary.