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A Study on the Impervious Structure of Longtan Rollcrete Gravity Dam-Asphalt Mixture Impervious Structure

Sun Zhentian; Yang Quanmin(Xian University of Technology)  
This paper, based on investigation and analysis of 116 rollcrete dams both at home and abroad, presents that it's nesessary to construct an independent impervious structure in the rollcrete dams. The impervious structure may be classified in three types: (1) rigid structure, (2) soft structure, (3) composite structure. After analysing the asphalt mixture of the soft impervious type is recommended for Longtan RollcreteGravity Dam. Some problems of asphalt mixture such as duribility, environmental pollution, effect of applications are also discussed in this paper. In addition, the details of construction, the thickness of impervious layer,the type and proportion of the asphalt mixture are proposed, and the rheological lateral pressure of asphalt mixture is also calculated. At last, the comprehensive mechanization of construction and measure of quality controlare suggested.
【Fund】: “八五”国家重点科技攻关项目!85-208-04-04-13
【CateGory Index】: TV642.3
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