阳江上水库碾压混凝土重力坝深层抗滑稳定分析

通过建立最高坝段溢流坝段和最高坝段非溢流坝段模型,对阳江上水库碾压混凝土重力坝进行静、动力作用下的深层抗滑稳定分析,模型考虑了坝后白水瀑布陡崖的影响.静力计算是基于有限元强度折减法,无需假定滑动面,根据特征点位移突变以及塑性区贯通等判断准则来确定大坝的整体稳定性;动力分析采用振型分解反应谱法,由其导出水平地震剪力,并将该剪力作用在建基面上,在此基础上进行动力作用下的抗滑稳定分析.计算结果表明,各种工况下抗滑稳定安全系数均满足要求,失稳破坏时产生的可能滑移路径未通过下游白水瀑布陡崖,坝后白水瀑布陡崖不影响大坝安全.

Deep Anti-sliding Stability Analysis for RCC Gravity Dam of the Upper Reservoir of Yangjiang

In this paper,the deep anti-sliding stability analysis for the roller compacted concrete（RCC） gravity dam of the upper reservoir of Yangjiang under the static and dynamic action is done. In the model,the Baishui waterfall cliff behind the dam is considered.The static calculation is based on the finite element intensity discount method. Without the assumption of the sliding surface,its overall stability is determined by the judging criteria of the feature point displacement mutation and the run-through of plastic zone. The mode decomposition response spectrum method is used in the dynamic analysis,further derive the horizontal seismic shear,and then put the horizontal seismic shear force on the foundation plane to analyze the stability of the foundation plane and deep slide. Calculation results show that the stability safety coefficient of dam foundation under various conditions can meet the requirements,and the possible sliding path is not through Baishui waterfall cliff which is in the downstream,so the Baishui waterfall cliff has no effect on the safety of the dam.