小湾拱坝坝基含排水孔岩体渗流与应力耦合分析

小湾坝基岩体裂隙发育,坝基结构复杂且水推力巨大,为提高小湾坝基安全稳定性,基于含排水孔裂隙岩体渗流与应力耦合的复合单元算法,对小湾拱坝坝基含主排水孔系统裂隙岩体进行了三维渗流与应力应变耦合分析.通过算例分析,可以看出复合单元模型针对细部构造模拟时前处理简便快捷,且可真实反映裂隙、排水孔等细部构造的渗透特性;同时也可看出,小湾拱坝坝基考虑渗流与应力耦合时,水头等势线向坝基底区域集中,渗透坡降增加,同时坝基底渗流速度增加,下游区域流速有所减小.

Analysis of coupled seepage and stress in Xiaowan arch dam foundation with drainage holes

Aiming at the stability of Xiaowan arch dam foundation system,analysis of coupled seepage and stress in Xiaowan arch dam foundation system with drainage holes has been carried out by means of the composite element algorithm of seepage and stress coupling for fractured rock masses with drainage holes,because the fractures in foundation are well-developed and the water thrust is tremendous also.A careful analysis is made based on the composite element model,from which the advantage and the reliability of the composite element algorithm have been illustrated;and its preprocess work is very simple and convenient.It also can be seen that,the hydraulic potential contour lines are concentrated in the foundation region after the consideration of the coupling;and the seepage gradient increases;also the seepage velocity increases in the foundation region,but decreases in the downstream region with the coupling.