基于数值模拟和监测的边坡稳定性研究

Research on Stability of Slope Based on Numerical Simulation and Monitoring

为评价复杂水工边坡工程的稳定性,借助数值模拟和监测方法进行了综合研究。利用有限差分方法对边坡分步开挖进行了全过程数值模拟,计算了边坡施工过程中典型支护点的位移值和应力值。计算表明边坡施工中不存在塑性区,仅在边坡底部存在局部拉应力区。针对典型计算点,结合锚索应力计计算值和监测值对比分析了边坡受力特征,边坡的应力变化主要受边坡局部应力调整的影响;对比分析了多点位移计计算值和监测值,边坡变形主要受开挖扰动和卸荷回弹影响。边坡未出现突变现象,表明支护设计合理。边坡处于稳定状态。

To evaluate the complex hydraulic stability of the slope engineering,numerical simulation and monitoring methods were employed to study it.Using3d finite difference method for numericalsimulation on the whole process of slope excavation step by step on the basis of the geological survey,which shows that the slope does not exist plastic zone,only in the bottom of the slope exists partialtensile stress area.The displacement values and stress values of typical point were calculated the construction process of a slope supporting.For typical calculation point,Force characteristic of the slope were analyzed by combining with the calculated value of anchor cable stress meter and monitoring value,The changes Stress of the slope mainly were affected by the slope of local stress adjustment;Contrast analysis of the calculated value and the monitoring value of multi-point displacement meter,Slope deformation was mainly affected by the excavation disturbance and the unloading rebound.Slope not appear mutation phenomenon,supporting design is rational.Slope is in steady state.