龙滩水电站航道座滑边坡平面有限元模拟研究

基于弹塑性有限元（FEM）模型和Mohr-Cou lomb屈服准则,采用平面有限元法对龙滩水电站航道1+0161+080开挖边坡座滑前的稳定状况进行了数值模拟研究。对座滑前边坡的应力场、位移场及塑性屈服区的模拟结果表明,边坡在座滑前存在明显的塑性区,处于临界稳定状态;开挖过程中边坡存在连续变形,特别是开挖下部时变形会突然增大;座滑前边坡塑性区支护体系已达到承载极限,边坡具备了座滑的条件。

2D FEM SIMULATION OF SLIDING CUT SLOPE ON NAVIGATION CHANNEL OF LONGTAN HYDROPOWER STATION

Based on the elasto-plastic model and Mohr-Coulomb yielding criterion,a 2D finite element method(FEM) is applied to conduct numerical simulation of excavated sliding cut slope on the navigation route 1+016～1+080 of Longtan Hydropower Station.The calculated result are presented for the stress field,displacement field and plastic yielding area before the slope slid.The results show that there was an apparent plastic area at sliding cut slope which was in a state of critical instability.There was continuous deformation in the slope during excavation.Especially the deformation suddenly expanded when lower part of the slope was being excavated.The supporting system in the plastic area ahead of the landslide had reached its limit bearing capacity.The cut slope was ready to fail suddenly and quickly.