基于强度折减的洛宁抽水蓄能电站黄土边坡稳定性研究

Study on Loess Slope Stability of Luoning Hydropower Station Based on Strength Reduction

洛宁抽水蓄能电站业主营地区域某边坡为五级黄土边坡,为了确保边坡稳定性以及边坡前宿舍楼的安全,运用FLAC 3D有限差分软件对该边坡分步开挖施工及运行进行数值模拟,通过计算不同工况下边坡的变形,评价边坡安全状态。研究结果表明:施工期施加支护对边坡位移的抑制作用明显,边坡出现的位移最大值由140mm降低到16mm,锚杆支护对边坡位移的抑制作用很大,挡土墙的锁脚作用很明显;现场监测数据与数值模拟结果大致吻合,表明本次计算采用的数值模型是合理的;经过强降雨或雨季的岩土体干湿循环工况,边坡出现的位移值没有超过控制值,边坡安全风险处于可控状态。

A slope in the owner’s camp area of luoning power station is a five-grade loess slope.In order to ensure the stability of the slope and the safety of the dormitory building in front of the slope,the finite difference software FLAC3D is used to carry out numerical simulation on the step by step excavation,construction and operation of the slope,and the slope safety status is evaluated by calculating the slope deformation under different working conditions.The results show that:during the construction period,the maximum displacement of the slope is reduced from 140mm to 16mm,the anchor support has a great effect on the displacement of the slope,and the foot locking effect of the retaining wall is obvious.The field monitoring data and numerical simulation results are basically consistent,which shows that the numerical model used in this calculation is reasonable.After heavy rainfall or wet and dry cycle of rock and soil in rainy season,the displacement value of the slope does not exceed the control value,and the safety risk of the slope is under control.