毛尔盖心墙堆石坝防渗墙与坝体防渗体连接形式

Joint types for impervious walls and core mass of Maoergai core wall rockfill dam

介绍毛尔盖心墙堆石坝概况：最大坝高为147 m,河床覆盖层厚度为30-50 m,拟用混凝土防渗墙对坝基进行防渗处理。在分析防渗墙与心墙防渗体各种连接形式的优缺点之后,结合本工程实际和工程经验,选定防渗墙按硬接头接廊道的连接形式。进行有限元计算分析,确定防渗结构参数,防渗墙仅取1道,墙厚1.4 m。实践表明,采用该方案防渗墙和廊道内的应力适中、投资较少。

Maoergai core wall rockfill dam has the maximum height of 147 m and the overburden layer is 30～50 m in thickness.The dam foundation will be treated by use of impervious walls of concrete.The advantages and disadvantages of the joint types for impervious walls and core mass were analyzed.Based on the engineering background and experience,the scheme of gallery type with rigidity mode for the impervious walls was selected.FEM calculation and analyzed were employed to determine parameters for impervious structure,and only one impervious wall 1.4 m in thickness was adopted for Maoergai core wall rockfill dam.The case practice shows that the proposed scheme results in the moderate stress situation in the gallery and the concrete walls and relatively smaller engineering investment.