复杂地基重力坝深层抗滑稳定非线性有限元分析

Nonlinear FEM Analysis on Stability against Deep Layer Sliding of Concrete Gravity Dam with Complicated Foundation

重力坝的深层抗滑稳定是保证大坝安全的一个重要条件。针对《混凝土重力坝设计规范》(DL5 10 8—1999)中关于复杂地基重力坝的稳定性需进行有限元分析的新规定,笔者结合某重力坝稳定问题实例,用非线性有限元方法进行了分析计算,并与刚体极限平衡法及结构可靠度分析方法的成果进行了对比。对有限元法的适用性。

The stability against deep layer sliding of concrete gravity dam is one important condition to ensure the safety of a dam. In the new Design Specification for Concrete Gravity Dams (DL5108—1999), the FEM analyses on the stability against sliding of concrete gravity dams with complicated geological conditions are required. According to the new design specification, the stability of a concrete gravity dam is analyzed by the nonlinear FEM. The result is compared with the results of the method of limit equilibrium of rigid body and the method of structure reliability analysis. The adaptability of the FEM, the effect of lateral shearing resistance of rock mass and the express method of dam safety are discussed.