旁多大坝碾压式沥青混凝土心墙配合比设计

Design of mix proportion of roller-compacted asphalt concrete core wall in Pangduo Hydraulic Complex

西藏旁多水利枢纽大坝采用碾压式沥青混凝土心墙防渗,这是沥青混凝土防渗心墙第一次在高海拔地区的应用。心墙不但要适应深覆盖层、高地震烈度引起的大变形,同时还要考虑高海拔地区低温、强辐射和夏季多雨的气候对心墙施工质量的影响。经现场原材料选择和室内试验,初步确定沥青混凝土配合比后,再经施工模拟试验调整和生产性试验验证,最终确定了适应旁多水利枢纽大坝碾压式沥青混凝土心墙的施工配合比。经过两年的施工验证和现场取芯试验,心墙的各项性能指标均符合设计要求。详细介绍了配合比的设计过程,可供同类工程参考。

The roller - compacted asphalt concrete core wall is adopted as anti - seepage measures of Pangduo Hydraulic Com- plex in Tibet, which is firstly applied in high altitude areas. The core wall should adapt to large deformation caused by deep over- burden and high seismic intensity and the influences of low temperature, strong radiation in high altitude area and the rainy cli- mate in summer acting on construction quality should be considered. The concrete mix proportion of the core wall is firstly deter- mined by in - site selection of raw material and the laboratory test. The suitable mix proportion was finally determined by adjust- ment of the construction simulation test and the verification of productive test. Every performance index of the wall meets the de- sign requirements with a two - year constructional proof and boring sample test. Moreover, the design process of mix proportion is also illustrated in detail.