地震作用下岸坡坝段侧向抗滑稳定对比分析

Comparison and Analysis on Lateral Stability against Sliding of Dam Sections at Bank under Earthquake Action

岸坡坝段的抗滑稳定性关乎大坝结构运行安全。为研究地震作用下岸坡坝段的侧向抗滑稳定性,结合某工程采用ANSYS有限元软件建立岸坡坝段的三维有限元模型,分别采用拟静力法和反应谱法进行对比分析,结果表明:二者计算所得岸坡坝段地基面最大应力均小于地基允许承载能力4.0 MPa;稳定计算均满足抗滑稳定要求,反应谱法计算结果较拟静力法偏大。该对比结果可为实际工程设计和安全评估提供重要参考。

Stability of dam sections at bank against sliding is critical to the safety operation of dam structure.To study the lateral stability of dam section at bank against sliding under earthquake action and by application of ANSYS finite element software to build 3D finite element model for dam sections at bank in a hydropower project,pseudo-static method and spectrum response method are applied respectively to compare and analyze.It presents that the maximum stress on the foundation surface of the dam section at bank all are lower than 4.0 MPa the allowable bearing capacity of the foundation by two methods.The stability computation both satisfy requirement on stability against sliding.The stress by spectrum response method is higher than that by pseudo-static method.This comparison provides engineering design and safety assessment with reference.