狭窄河谷碾压混凝土高拱坝分缝形式研究  

Research on Joint Types of High RCC Arch Dams in Narrow Valley

作　　者：汪罗 陈媛[2] 李茜希 

机构地区：[1]贵州省水利水电勘测设计研究院,贵阳550002 [2]四川大学水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《中国农村水利水电》2017年第8期160-165,共6页China Rural Water and Hydropower

摘　　要：特殊的地理条件使得西部地区形成了许多狭窄河谷,对于这些狭窄河谷,修建碾压混凝土高拱坝具有节约水泥用量、简化施工工艺、加快施工速度和工程造价低等优点。而狭窄河谷碾压混凝土高拱坝在施工及运行期可能会因为过大温度应力从而产生危及坝体安全的贯穿性裂缝,解决此问题的方法之一是在坝体上设置结构缝。立洲碾压混凝土拱坝最大坝高为132 m,为世界级高碾压混凝土拱坝。根据立洲碾压混凝土拱坝地质力学模型试验结果,得出坝体需设缝的必要性。随后采用三维有限元数值计算方法,通过建立立洲碾压混凝土拱坝三维有限元分析模型,探讨、评价各分缝方案中在正常运行期坝体的应力、变形特征。在此基础上,通过超载至模型失稳破坏,研究不同分缝形式下坝体的开裂破坏特性,找出一种相对较优的坝体分缝方案,以期能为工程的设计提供一些参考。Special geographical conditions make the western region formed many narrow valleys,construction of high RCC arch dam in these narrow valleys can saving cement,simplify operational procedure,speed up the construction speed and low cost etc. During the construction and operation period,narrow valley high RCC arch dam may be in danger through penetrating crack caused by excessive thermal stress. One way to solve this problem is to set up the structural joints in the dam. Lizhou RCC arch dam height is 132 m,it＇s the world class high RCC arch dam. In this paper,according to the results of geomechanical model test,it is necessary to set up the joints. And then though threedimensional finite element analysis model is used to establish the three-dimensional finite element analysis model of Lizhou RCC arch dam,to study and evaluation of the joint program in the stress and deformation characteristics of the dam during the normal operation period. On this basis,by overloading to model failure,study on damage characteristics of different joint forms under the dam cracking. To find a better solution to the dam joint and provide some reference for engineering design.

关 键 词：狭窄河谷 碾压混凝土高拱坝 分缝形式 模型试验 诱导缝效果 

分 类 号：TV314[水利工程—水工结构工程]