深厚覆盖层上混凝土防渗墙的应力变形特性  

On the stress and deformation of cut-off wall in the deep overburden

作　　者：邱祖林[1] 陈杰[1] 

机构地区：[1]江苏省地质调查研究院,南京210049

出　　处：《水文地质工程地质》2006年第3期72-76,共5页Hydrogeology & Engineering Geology

摘　　要：建造在深厚覆盖层上的心墙坝,通常由土质心墙和其下部的防渗墙构成完整的防渗体系,防渗墙将受到水荷载和上覆坝体荷载的双重作用。本文采用三维非线性有限元分析了某心墙坝工程软弱覆盖层上两道混凝土防渗墙(第一道为嵌岩式,第二道为悬挂式)的应力变形特性并对其安全度评价方法进行了介绍。计算结果表明:①嵌岩式防渗墙和悬挂式防渗墙表现了不同的应力应变特性;②两道防渗墙的拉压应力均已超出混凝土的允许范围,建议采用高强低弹的混凝土配方。As far as the cored rockfill dam built on the deep overburden, its impervious system is usually made up of the soil core and cut-off wall, which will be subject to both the water load and the overlaying soil load. The stress and deformation of the double concrete cut-off walls （the upstream cut-off wall is embedded in the bedrock and the downstream one is suspended） of some a cored rockfill dam are analyzed by 3-D Nonlinear FEM, and its evaluation method of safety degree is introduced. The calculation results show that： ①The embedded cut-off wall and the suspended cut-off wall have different stress and strain characteristics; ②Because the tensile stress and the compression stress of the double concrete cut-off walls exceed their proof strength, so the high-strength and low-modulus concrete is suggested. The above results provide theoretical basis for the optimum design of cut-off wail.

关 键 词：防渗墙 软弱覆盖层 应力变形 高强低弹混凝土 

分 类 号：TV223.42[水利工程—水工结构工程]