Earth Dam With Asphaltic Concrete Core Wall Design And Construction Technology

By combining the design of cast asphalt concrete core earth-rock dam of Nierji Hydroelectric Projects, an optimize study on the structural types and construction technology of cast asphalt concrete core are carried out in the article. The main contents of the study are summed up as follows:At present, the main and auxiliary core structures are widely adopted in the design of the cast asphalt concrete core earth-rock dam in the state, i.e. the main core to be asphalt concrete and auxiliary core of asphalt mortar masonry. This kind of structures will cause the principal stress difference bigger due to the sharp changes modulus of deformation between auxiliary core and main core, auxiliary core and upstream and downstream transition materials, which is disadvantage of stress transmission. Therefore through a stress analysis to transition layers and main core, it is studied to improve stress conditions by canceling auxiliary core so as to make direct contact between main core and transition materials.Furthermore according to the previous construction experience, the existence of auxiliary core limits the use of effective mechanized construction on asphalt concrete and effects the project progress. So it is necessary to cancel the auxiliary core from the point view of construction technique. Meanwhile questions on how to solve without auxiliary core masonry and construction technique of asphalt concrete core are raised after the auxiliary core's cancellation.Analysis and study are carried out in the article on the thickness selection of cast asphalt concrete core and transition layers, the connections of core to dam foundation and concrete structures, the types of connection and questions to core between different dam foundations and concrete structures are given also. Meanwhile quality control of asphalt concrete core construction and character of construction diversion are analyzed and mentioned briefly.