木里河某碾压混凝土拱坝分缝形式研究

Research on the Joint Form of a RCC Arch Dam on the Muli River

四川省木里河上某拱坝采用碾压混凝土筑坝技术,在碾压施工的过程中封拱,对坝体的开裂控制要求较高。若能找出一种相对较优的坝体分缝形式,通过诱导缝传递及释放应力,有利于确保拱坝的完整性。参考同类工程,结合沙牌拱坝"八五"及"九五"攻关的研究成果[1,2],针对该拱坝提出3种分缝方案:横向设置4条诱导缝方案、横向设置2条诱导缝加周边应力释放缝方案、横向设置3条诱导缝方案。应用ANSYS软件分析,揭示正常工况下各分缝方案坝体的应力、变位及分布特征,在此基础上,通过超载至模型失稳破坏,研究了不同分缝形式下坝体的破坏过程及破坏形态,根据各方案的应力、变位及超载特征的对比分析,推荐一种相对较优的拱坝分缝方案。

An arch dam using the technology of roller compacted concrete RCC on Muli River, in the construction process of arch dams, crack control requirements are higher. If we can find a kind of relatively superior dam partition form, by inducing joint trans- fer and stress release, to ensure the integrity of arch dams. This paper, referes similar works, in combination with Shapai Arch Dam ＂85＂ and ＂95＂ key research results for the arch damE1＇27 , puts forward three kinds of joints design： transversely arranging four in- duced joint schemes, transversely arranging two induced joints and peripheral stress release seam scheme, transversely disposing three induced joint schemes. Application of ANSYS software reveals three joints design of the dam body stress, displacement and distribution characteristics under normal conditions. On the basis of this, by overloading to model failure, different joint forms of dam failure process and failure modes, according to the scheme of the stress, displacement and overload characteristic comparative a- nalysis, a relatively superior arch dam joint prograrnm is recommended.