官地水电站重力坝深层抗滑稳定分析

官地水电站坝址区地质条件复杂,缓倾角错动带和裂隙较发育,分布比较普遍,因此坝基深层抗滑稳定问题受到高度关注。利用ANSYS有限元分析软件,选取#13坝段作为典型坝段,结合该坝段工程实际和概化的滑移通道,建立三维有限元模型,采用强度储备法分析坝基的深层抗滑稳定性、坝体及坝基的位移和应力变化规律。结果表明,三维非线性有限元分析在以塑性区贯通为失稳判据的情况下,最危险的滑移通道1的深层抗滑稳定安全系数大于3.0,可见#13坝段深层抗滑稳定满足规范要求。

Analysis of Stability against Deep Sliding of RCC Gravity Dam for Guandi Hydropower Station

The dam site has complicated geological conditions with widely distributed low-angle rupture belts and cracks. The stability against deep sliding in the dam foundation is prominent. Using the ANSYS finite element analysis software, combining with the engineering practice and the proposed sliding channels of No.13 dam section, this paper established three-dimensional finite element model. And then the strength reserve safety factor method is used to analyze the stability against deep sliding of the dam foundation and the rules of displacement and stress distribution of the dam body and foundation. The results show that when using the nonlinear finite element analysis method and regarding the breakthrough of the plastic zone as instability criteria, the safety factor of stability against deep sliding for the most dangerous sliding channel is greater than 3.0. So, the stability against deep sliding of No. 13 dam foundation meets the demand of regulations.