极限状态分析在岩滩大坝抗震能力研究中的应用

采用极限状态分析法对岩滩大坝典型16号坝段进行抗震能力研究,坝体强度抗震按照重力坝设计规范,坝体水平截面上上下游边缘正应力计算以及上下游边缘主应力采用规范规定的材料力学方法,满足抗震强度要求。坝体沿建基面的抗震稳定安全性按强度最不利应力叠加原则进行分析,则抗震稳定安全系数为4.24;按稳定最不利应力叠加原则进行抗震稳定安全分析,则坝体沿建基面的抗震稳定安全系数为2.47。两种分析法的结果均大于规范要求的1.0,表明坝体抗震稳定安全系数满足极限状态设计要求。

Application of limit state analysis in research of seismic capacity of Yantan dam

Limit state analysis was adopted in research of seismic capacity of the dam block 16 of Yah- tan dam. The method in design code for gravity dam was used in the seismic calculation and the material mechanics method in the code was used to calculate the normal stress and principal stress at the up- stream-downstream edge of dam horizontal section. Result showed that it could meet the earthquake-re- sistant requirements. Regarding the seismic stability along the foundation, in the conditions of the most unfavorable stress superposition for strength and for stability, the safety factor of seismic stability was 4.24 and 2.47, respectively, which met the requirement, namely larger than 1, in the code. It showed that the safety factor of seismic stability satisfied the requirement of limit state design.