里石门拱坝坝体应力变化规律分析  

Analysis on stress changes in Lishimen Arch Dam

作　　者：钟再相 

机构地区：[1]浙江里石门水库管理局,浙江天台317205

出　　处：《大坝与安全》2003年第1期38-42,共5页Dam & Safety

摘　　要：本文根据里石门薄拱坝应力监测成果,分析了施工期、运行期坝体应力变化,得出施工期坝体应力大于运行期;坝体裂缝均产生在施工期和蓄水初期;坝体实测应力分布与设计计算成果有差异,最大拉应力出现在中层拱圈拱冠下游面;温度荷载是坝体的主要荷载,其中上下游面温度梯度及局部非线性温差对薄拱坝应力影响很大;拱座最大推力发生在夏季温升时等结论,并对下游面裂缝成因进行了分析。According to the results of observation on thin arch dam of Lishimen,the changes of dam body stress during the cnstruc-tion and operation are analyzed in this paper and got the conclusion that the dam body stress under construction is bigger than that in operation,cracks occurred at construction period and itiatial impound,observation stress distribution differs from design calcu-lation,maximum stress is at downstream of central arch crown,tempreture load is main load,of which the tempreture gradient at upstream and downstream and partial linear tempreture difference have a great influence on thin arch stress,the maximum thrust at arch foundation usually works in the summer and so on.The reasons of cracks downstream has been analyzed as well.

关 键 词：坝体 应力 薄拱坝 蓄水 裂缝 

分 类 号：TV698.1[水利工程—水利水电工程]