胶凝砂砾石坝极限承载力及超载破坏分析  

Ultimate Bearing Capacity and Overload Failure Analysis of Cemented Sand and Gravel Dams

作　　者：朱文凯 陈新[1] 李权燎 王兆强 张磊 ZHU Wen-kai;CHEN Xin;LI Quan-liao;WANG Zhao-qiang;ZHANG Lei(College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,Sichuan Province,China;Yunnan Institute of Water and Hydropower Engineering Investigation,Design and Research,Kunming 650021,Yunnan Province,China)

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]云南省水利水电勘测设计研究院,云南昆明650021

出　　处：《中国农村水利水电》2018年第8期136-140,共5页China Rural Water and Hydropower

基　　金：国家科技支撑计划子课题项目(2014BAB03B04)

摘　　要：为了得到胶凝砂砾石坝结构破坏的一般规律,参考重力坝分析思路,基于非线性有限元方法,对胶凝砂砾石坝进行数值模拟;参考地质力学模型破坏试验研究方法,研究其坝体应力、变形、坝体结构破坏过程以及极限承载力,比选出适合模拟胶凝砂砾石坝结构破坏的超载方法,并以那恒水库CSG坝为模型进行超载分析。结果表明,胶凝砂砾石坝在超载后坝踵、坝趾率先出现屈服区,坝踵在拉、压应力相互作用下,较坝趾更容易屈服破坏;相比目前破坏试验主要使用的研究方法,以水荷载超载为主的综合法更适合胶凝砂砾石坝超载破坏研究。Based on an analysis of gravity dams and nonlinear finite element theory,numercial simulation is given to obtain the general law of structural failure of cemented sand and gravel dams. With referrence to the geo-mechanical model failure testing,the stress,deformation,structure failure process and ultimate bearing capacity of the dam are studied,and an overload method suitable for simulating the structural damage of the cemented sand and gravel dams is selected and the method is applied to Naheng CSG dam. The results show that the yield region first appears in dam heels and dam toes,under the interaction of tension and compressive stress,the dam heel is more likely to yield and damage than the dam toe. Compared with the research methods used in the current destruction test,the results obtained by the synthetic method based on overloading are more consistent with the engineering examples.

关 键 词：CSG坝 应力 变形 数值模拟 极限承载力 超载破坏 

分 类 号：TV641[水利工程—水利水电工程]