狭窄河谷碾压混凝土高拱坝分缝形式研究

发布时间：2018-03-25 01:28

本文选题：狭窄河谷　切入点：碾压混凝土高拱坝　出处：《中国农村水利水电》2017年08期

【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。
[Abstract]:Because of the special geographical conditions, many narrow valleys have been formed in the western region. For these narrow valleys, the construction of high RCC arch dams has the advantages of saving cement consumption and simplifying the construction process. The speed of construction and the low cost of the project can be accelerated. However, the narrow valley RCC high arch dam may cause penetrating cracks which endanger the safety of the dam because of excessive temperature stress during construction and operation. One of the methods to solve this problem is to set structural joints on the dam body. The maximum dam height of Lizhou RCC arch dam is 132 m, which is a world-class high RCC arch dam. According to the results of geomechanical model test of Lizhou RCC arch dam, The necessity of establishing joints in dam body is obtained, and the stress of dam in normal operation period is evaluated by establishing three-dimensional finite element analysis model of Lizhou RCC arch dam by using three-dimensional finite element numerical calculation method. On the basis of this, the cracking and failure characteristics of dam body under different joint forms are studied by overloading to model instability failure, and a relatively better jointing scheme is found, in order to provide some references for engineering design.
【作者单位】：贵州省水利水电勘测设计研究院;四川大学水力学与山区河流开发保护国家重点实验室;
【分类号】：TV544.921

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