拱坝坝肩单薄岩体稳定性与加固方案数值模拟分析

Numerical modeling analysis of rock stability and its reinforcement project for the thin abutment of an arch dam

通过数值模拟研究 ,分析了不同工程加固措施对改善单薄山体拱坝坝肩岩体稳定性的效果。提出采用坝顶设伸缩缝等工程措施 ,使坝顶荷载作用点距单薄山体顶部论有一定距离 ,避免拱坝推力作用下在山体中形成过大的拉应力区 ,避免有利于风化的低围压岩体作为坝肩承载岩体 ,从而保持坝肩岩体的长期稳定。

By numerical modeling analysis, the effect of different reinforcement measures to improve the stability of dam abutment of thin rock mountain is studied in the paper. It is revealed that increasing the distance between application point and the top of the thin mountain, such as setting expansion joint at the dam crest, can avoid the appearance of bigger tensile stress area under the action of the arch dam thrust, and avoid the low confining pressure to be loaded on the dam abutment. Therefore, the rock foundation can keep long-term stability.