金佛山沥青混凝土心墙坝坝坡稳定性有限元分析

Finite Element Analysis of Dam Slope Stability of Jinfoshan Asphalt Concrete Core Wall Rock-fill Dam

针对重庆市金佛山水利工程沥青混凝土心墙堆石坝,采用有限元强度折减法,研究了上、下游坝坡在竣工期、蓄水期及水位骤降等不同工况下的稳定性。结果显示,在竣工期、蓄水期和水位骤降期的坝坡安全系数均符合规范要求。与极限平衡分析方法相比,强度折减法在滑弧面及塑性区的分析中弥补了极限平衡法中无法准确确定滑动面具体位置及滑体大小的缺陷,但是强度折减法计算结果偏安全,因此将两种方法结合进行稳定性分析,结果更为客观。

The finite element strength reduction method was used to analyze the upstream and downstream dam slope stability of Jinfoshan asphalt concrete core wall rock-fill dam under different working conditions including the completion period, impound- ment period, and sudden water-level decreasing period. The results showed that the clam slope safety coefficients meet the stand- ard requirements under the completion, impoundment, and sudden water-level decreasing periods. Compared with the limit equi- librium analysis method, the finite element strength reduction method can overcome the disadvantages of limit equilibrium analy- sis method to determine the specific location of slide surface and the size of sliding mass in the analysis of slide surface and plas- tic area, but the results determined by the finite element strength reduction method were safer. Therefore, the combination o{ the two methods to analyze the slope stability can provide more reasonable results.