混凝土拱坝溃口范围定量判定  

Analysis of dam-break case of concrete arch dam and quantitative forecast failure scope based on ANSYS software

作　　者：方崇惠[1,2] 韩翔[2] 段亚辉[1] 袁俊光[2] 方波青 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]湖北省水利厅,湖北武汉430064 [3]中国水电七局一分局,四川成都620860

出　　处：《武汉大学学报（工学版）》2010年第6期689-693,共5页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:50679063);水利部公益性行业科研专项(编号:200701015);教育部科技发展中心科研基金(编号:20090141110022);湖北省水利重点科研课题

摘　　要：为了定量判定溃口范围,以小寨子河水库混凝土拱坝溃坝实例建三维实体模型,采用弹塑性有限元法,针对水库初期蓄水、溃坝气候条件,拟定溃坝水位+温降+自重工况,对坝体和坝基溃坝时受力(荷载)情况进行数值仿真分析.结果表明:坝体结构单薄,设计不合理,不符合规程规范要求;坝体中部一、二期混凝土交界冷缝是最薄弱部位;以受压为主、受拉为辅共同作用发生屈服破坏而局部溃坝;溃口首先发生于受压剪M-C安全系数小于1的坝体贯穿部位,最终的溃口范围覆盖M-C安全系数2.0区域,可作为计算拱坝溃坝洪水时确定溃口范围的参考依据之一.In order to quantitative forecast failure scope,taking Xiaozhaizi River Reservoir concrete arch dam for engineering example,3D solid model is built and elastoplastic finite element method is used by ANSYS software.The dam work conditions of its water levels,temperature drop and deadweight are defined when the dam breaks with the early period storage and climatic conditions.The dam-break loads （or forces） of the dam and its base are simulated.The results show that the dam structure is not enough strong; and its design does not meet the specifications.The weakest position of dam is at the junction of the cold concrete both the first and second joint in the middle of dam;the dam part break happens by both compression and tension; the dam-break first occurrs where the compressive and tensile strength M-C safety factor is less than 1; the dam-break end-scope covers the safety factor 2.0 M-C,so as to forecast the quantitative failure scope of concrete dam.

关 键 词：混凝土拱坝 溃坝机理 弹塑性有限元法 安全系数 溃口范围 

分 类 号：TV642.4[水利工程—水利水电工程]