边坡开挖数值模拟及其稳定性评价研究

Numerical Simulation and Stability Evaluation of Slope Excavation

利用有限元分析原理和ANSYS软件单元生死功能相结合的手段,模拟某边坡开挖过程,具体采用有限元强度折减法开展边坡开挖过程数值模拟分析,探讨坡体位移、应力动态演化过程,解决了边坡开挖动态模拟的难题。提出确定边坡支挡最优实施时间方案,并论证其合理性,探讨了提高数值模拟精确度的方法,结合多种计算方法,评价各开挖步骤边坡稳定性,通过与常规计算方法对比,验证有限元强度折减法的可靠性,同时弥补了常规研究的不足之处。

In this paper, slope excavating was simulated using the finite element method and the unit life and death of the ANSYS function, strength reduction FEM was adopted and numerical simulation of the excavation process was carried out. The dynamic evolution of the displacement, stress was discussed. The solution for dynamically simulating the slope excavation was presented. The best time of the slope retaining was determined and its reasonableness and effect were proofed. The advice on improving the accuracy of numerical simulation was discussed. Combination of a variety of calculation methods, slope stability of the excavation steps was evaluated and the reliability of strength reduction FEM was validated, and make up for inadequacies of the conventional research at the same time.