不同水位作用下堆石坝坝坡有限元强度折减法分析

Strength Reduction FEM Analysis of Slope Stability of Rock-fill Dam Under Different Water Levels

以某加固后的堆石坝工程为例，采用有限元强度折减法，研究了在不同水位组合和坝顶通车条件下的坝坡稳定性。计算结果表明：高水位对应侧的坝坡稳定性相对较高；水位越低.上下游水位差越大.坝坡的安全系数越大，反之则越小；坝顶通车对坝坡的稳定性不利，尤其是水位组合173.67-143.30m和152.00-167.30m时；该堆石坝在加固后的坝坡稳定性系数基本满足相关规范要求，最小安全系数出现在水位组合152.00-167.30m时的上游坝坡，此时坝坡属于稳定状态，但安全储备较小。

This article takes reinforced rock-fill dam engineering as an example and adopts the strength reduction FEM method to study the stability of dam slope under the condition of different water levels and opening traffic on the crest. The calculation results show that the stability of high water level＇s corresponding side of the dam slope is relatively higher,the lower the water level and the bigger of stage differences of upstream and downstream, the greater the safety coefficient of dam slope. Conversely, the stability of dam slope is poor;when the water level＇s combination arrives at 173.67 m to 143.30 m and 152.00 m to 167.30 m,opening to traffic on the crest is adverse to the stability of the clam slope;the stability coefficient of the rock-fill dam after the reinforcement satisfies the basic requirements of the relevant specification. The minimum safety factor appears at the upstream when the water,level combination is from 152.00 m to 167.30 m and the dam slope is in a stable state at this time. However,the safety stock is in an insufficient state.