深覆盖层上土石坝心墙与防渗墙连接型式研究

发布时间：2018-01-30 13:53

本文关键词： 深厚覆盖层沥青混凝土心墙坝封闭式防渗墙连接型式非线性有限元法　出处：《岩土工程学报》2017年05期 　论文类型：期刊论文

【摘要】：深厚覆盖层上建造的土石坝常采用封闭式防渗系统。当心墙坝防渗系统坝体采用沥青混凝土心墙、坝基采用封闭式防渗墙时,心墙混凝土基座、防渗墙与相邻土体之间将产生不均匀沉降,易引起基座混凝土断裂和坝壳及覆盖层土体剪切破坏。针对心墙坝坝体心墙与坝基防渗墙合理的连接型式问题,结合某水库工程,采用非线性有限元法,建立三维有限元模型,分析研究了心墙基座与防渗墙不同连接型式下坝体与坝基的变形和应力。通过坝体和坝基的变形协调分析以及心墙基座和防渗墙的应力分析,推荐了合理的连接型式,即深厚覆盖层上沥青混凝土心墙坝坝基采用封闭式防渗墙时,宜采用心墙基座与防渗墙间预留空隙的连接型式,其空隙大小与坝基覆盖层厚度及其力学特性以及防渗墙弹性模量有关,需经计算分析确定。
[Abstract]:Closed seepage control system is often used in earth-rock dams built on deep overburden. Asphalt concrete core wall is used in dam body of seepage prevention system of caution wall and concrete base of core wall is used when closed impervious wall is adopted in dam foundation. There will be uneven settlement between the impermeable wall and adjacent soil, which will easily lead to the breakage of foundation concrete and shear failure of dam shell and overburden soil, aiming at the reasonable connection type between the core wall of the core dam and the impervious wall of the dam foundation. Combined with a reservoir project, a three-dimensional finite element model is established by using nonlinear finite element method. The deformation and stress of the dam body and the dam foundation under different connection types of the core wall base and the impervious wall are analyzed. The stress analysis of the core wall base and the impervious wall is carried out through the coordinated analysis of the deformation of the dam body and the dam foundation as well as the stress analysis of the core wall base and the impervious wall. The reasonable connection type is recommended, that is, when the closed impervious wall is adopted in the bituminous concrete core dam foundation on the deep overburden, the connection type between the core wall base and the impervious wall should be reserved for the gap between the core wall base and the impervious wall. The size of the voids is related to the thickness and mechanical properties of the overburden of the dam foundation and the elastic modulus of the impervious wall, which needs to be determined by calculation and analysis.
【作者单位】：河海大学水利水电学院;
【基金】：国家自然科学基金项目(51179062) 江苏省自然科学基金青年基金项目(BK2012410) 中央高校基本业务费项目(2014B11914) 江西省水利科技项目(KT201545)
【分类号】：TV223.4;TV641
【正文快照】： 在深厚覆盖层上修建土石坝,防渗系统通常由心墙与混凝土防渗墙组成。由于混凝土防渗墙的弹性模量与覆盖层相差较大且覆盖层深度大,因此在坝体自重作用下,覆盖层与防渗墙之间的变位不协调,两者之间产生较大的沉降差,易引起防渗墙裂缝及覆盖层土体破坏等问题,尤其是对于封闭式防

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