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结合有限元强度折减法,用点接触模拟滑面,提出了适用于已知滑裂面的滑坡稳定性分析及滑坡推力计算的数值计算方法。以滑坡体为分析对象,用切向和法向两组弹簧的弹簧力来模拟滑裂面上的剪切力和法向力;结合强度折减法和摩尔-库仑强度准则对滑面弹簧刚度进行迭代计算,求解得到了满足静力平衡的数值解。该方法避免了极限平衡条分法求解边坡稳定性时需对条间力进行诸多假设的局限,也避免了有限元强度折减法求滑坡推力时需加桩计算的不便及收敛困难等问题。新方法能计算出极限状态下滑坡体上的应力、滑裂面上的边界力和稳定性系数以及给定安全系数下滑坡体上任意截面的滑坡推力大小、作用方向和位置,具有较严格的理论基础,可为实际工程中滑坡的治理提供一定的参考。
Combined with the strength reduction method of finite element method, the numerical simulation method of landslide stability and landslide thrust calculation suitable for the known sliding surface is proposed by using the point contact simulated sliding surface. Taking the landslide body as the analysis object, the shear force and the normal force on the slip surface are simulated by the spring force of the two sets of springs in the tangential direction and the normal direction. The stiffness of the sliding surface spring is combined with the strength reduction method and the Mohr Coulomb strength criterion After iterative calculation, the numerical solution satisfying the static equilibrium is obtained. This method avoids the limitations of the limit equilibrium method for solving the assumptions of the stability of the slope and also avoids the inconvenience and difficulty of convergence when calculating the thrust of the landslide by the finite element strength reduction method. The new method can calculate the stress, the boundary force and stability coefficient of landslide under the limit state and the magnitude, direction and position of landslide thrust at any section of landslide with given safety factor, and has the stricter Theoretical basis, which can provide some reference for the management of landslides in practical engineering.