我国某核电厂核岛基坑边坡加固有限元分析

摘要

The pit foundation figure of certain nuclear power plant in our country is anomalous, and there is a big lifting load on the slope top� Adopt prestressed anchor cable and beam to support the slope� Con⁃traposing the three-dimensional influence, adopt three⁃dimensional elastoplastic FEM strength reduction method to analyse slope stability, and analyse the E⁃equivalent strain, safety factor, displacement distribu⁃tion and major stress distribution of the support slope� The result indicates that the slope design and sup⁃port meet the engineering practice requirement, and three⁃dimensional strength reduction method is obvi⁃ously preponderant in the complicated slope analysis.%我国某核电厂核岛基坑边坡形状不规则，体形复杂，坡顶有较大吊装荷载，边坡采用预应力锚索＋腰梁进行支护。本文针对边坡的三维效应，采用三维弹塑性有限元强度折减法计算边坡的稳定性，分析了支护完成后边坡等效塑性应变区、安全系数、位移分布和主应力分布。结果表明边坡设计与支护满足了工程实际需求，三维强度折减法在复杂边坡分析中具有明显优势。