峡谷地区高堆石坝面板结构性拉裂破坏机理及改善措施  

Mechanism of structural tensile damage to concrete face slabs of high CFRDs in narrow valley regions and improvements

作　　者：杨超[1] 党发宁[1] 薛海斌[1] 高俊[1] 

机构地区：[1]西安理工大学岩土工程研究所,西安710048

出　　处：《水力发电学报》2017年第4期95-103,共9页Journal of Hydroelectric Engineering

基　　金：陕西省科技统筹创新工程重点实验室项目(2014SZS15-Z01);水利部公益性行业科研专项基金资助项(201501034-04)

摘　　要：面板的裂缝是峡谷地区修建高面板堆石坝面临的关键问题。总结峡谷地区面板堆石坝工程中发生的面板结构性拉裂破坏现象,分析了此类破坏的发生机制,认为堆石体沿着陡峭的岸坡向河谷中心的滑移变形是导致岸坡处面板发生结构性拉裂破坏的主要原因。对拱型面板堆石坝和直线型面板堆石坝进行了有限元计算对比分析,结果表明:拱型面板堆石坝可以在不改变坝体主要应力变形特性的前提下,有效地避免面板发生结构性拉裂破坏,在陡边坡峡谷地区采用拱型面板堆石坝对大坝的安全更加有利。A key issue in construction of high CFRDs in deep narrow valleys is the cracking of their concrete face slabs owing to local tensile stress.This paper presents an analysis on the mechanism of structural tensile damage that already occurred to the concrete face slabs of several existing high CFRDs and demonstrates the major cause of such damage at locations near river bank-sliding deformation of the rock-fills from river bank to river channel.A 3-D FEM analysis was used to compare the deformation in arch-shaped face slabs with that in widely used planar face slabs.The results show that the arched concrete face slabs can completely avoid this type of structural tensile damage without need to change the main stress or displacement properties of the dam.The arched shape of CFRDs is more favorable to the safety of dams that are built in deep narrow valley regions.

关 键 词：峡谷地区 面板堆石坝 拱形面板堆石坝 面板结构性拉裂破坏 改善措施 

分 类 号：TV641.4[水利工程—水利水电工程]