基于界面元法的向家坝重力坝深层抗滑稳定分析

重力坝的深层抗滑稳定分析多采用刚体极限平衡分析方法和非线性有限元法，但通常的刚体极限平衡法不能反映坝基岩体渐近失稳过程和破坏的力学机制，非线性有限元法则难以解决坝基中软弱结构面位移不连续问题。结合向家坝工程，建立了泄④坝段的计算模型，采用界面元法进行了大坝深层抗滑稳定分析，给出了坝基中破坏区的范围和分布，以及坝基的渐进破坏过程和可能滑体的抗滑稳定安全系数等成果，为坝基处理措施提供了重要的技术参考依据。研究结果表明，所建立的分析方法可以自然描述坝基岩体各种介质的错动、张开和滑移等不连续变形的特征，可用于重力坝坝基的深层抗滑稳定 分析。

Analysis of anti-sliding stability in deep foundation of Xiangjiaba gravity dam based on interface element method

The rigid body limit equilibrium method and the nonlinear finite element method are often used in the analysis of anti-sliding stability in deep foundation of gravity dam. But the rigid body limit equilibrium method can not reflect the process of progressive instability and mechanical mechanism on failure for rock mass while the nonlinear finite element method is difficult to solve the displacement discontinuity of weak structural plane. Combining the research with Xiangjiaba project, the analysis of anti-sliding stability in deep foundation for 4th monolith has been carried out using interface element method. The results can supply most dangerous location, the scope and distribution of failure zone in weak structural plane and process of progressive failure in dam foundation as well as the safety coefficient of possible sliding body. These achievements provide an important technical reference reliance for dam foundation treatment measures. The computational results show that the interface element method can naturally describe discontinuous deformation of rock mass such as dislocation, openness and sliding. Besides, this method is characterized by good adaptability, calculation conveniently and high compatibility, thus being regarded as an effective way to make an analysis of anti-sliding stability in deep foundation of gravity dam