研究生论坛：含不同倾角结构面的重力坝坝基深层抗滑稳定研究

为了研究存在不同倾角结构面时的重力坝坝基深层抗滑稳定问题，本文基于超载理论的地质力学模型试验，对含双倾斜结构面的某水利枢纽中的C#坝段进行破坏试验，得到坝基的破坏机理以及超载安全系数K_p=3.0，再采用有限元，对天然坝基存在的不同倾角结构面进行多种组合计算分析，得到含单倾斜结构面坝基超载安全系数K_c=2.6、双倾斜结构面坝基超载安全系数K_c=2.4。研究结果表明：对于含双倾斜结构面的重力坝坝基，模型试验与有限元计算所得的大坝破坏失稳过程相似，模型试验得到的超载安全系数略大于有限元计算所得超载安全系数；含不同倾角结构面重力坝坝基，其失稳滑动模式和破坏机理均不同。本研究采用两种不同的方法进行对比分析，相互验证，揭示了含不同倾角结构面的重力坝坝基深层滑动的破坏机理。

Study on deep anti-sliding stability of gravity dam foundation with different inclined structural planes

In order to study the deep anti-sliding stability of gravity dam foundation with different inclined structural planes, first, the three-dimensional (3D) geo-mechanical model test was used in C # dam section with double inclined structural planes of a water conservancy project, and a failure test was carried out based on overloading method. Through the test the failure mechanism of the gravity dam foundation was obtained and the overload safety factor K_p was found as 3.0. Then, the finite element method was used to analyze and calculate the sliding stability of the natural dam foundation with different inclined angles and the structural planes, Calculations proves that the overload safety factor with single inclined structural planes in gravity dam foundation K_c was equal to 2.6 and the overload safety factor with double inclined structural planes in gravity dam foundation K_c was equal to 2.4. The results indicate that the gravity dam failure process of modal test and finite element calculation were extremely similar for the gravity dam foundation with double inclined structural planes, Besides the overload safety factor obtained by the model test is slightly larger, The unstable sliding mode and failure mechanism of gravity dam foundations with different inclined structural planes are different. In this study, two different methods are used to compare and verify each other, and the failure mechanism of deep anti-sliding stability of gravity dam foundation with different inclined structural planes was revealed.