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在高地震烈度区和深厚覆盖层等特殊环境和复杂地质条件下建造沥青混凝土心墙堆石坝已越来越受到重视,目前国内还没有此类坝型遭遇强震的记录.由沥青混凝土心墙、混凝土廊道和混凝土防渗墙组成的防渗系统往往是工程成败的关键环节.位于大渡河上的某工程最大坝高85.5m,防渗墙深111.0m,如此深的防渗墙在工程中并不多见.为了研究强震区深厚覆盖层上沥青混凝土心墙堆石坝防渗系统的抗震安全性,以此工程为背景,建立三维有限元模型,并采用子模型技术对防渗系统进行精确模拟.计算分析得出了关于防渗系统的加速度、动位移和动应力反应分布规律,认为沥青混凝土心墙堆石坝的防渗系统在地震过程中是安全的,具有较好的抗震性能.
Asphalt concrete core rockfill dam has been paid more and more attention in special conditions and complex geological conditions, such as high earthquake intensity area and deep overburden, so far there is no record of strong earthquakes encountered by such dam types in China. The impermeable system consisting of walls, concrete corridors and concrete cutoff walls is often the key link of success or failure of a project. The maximum dam height of a project located on the Dadu River is 85.5m and the cut-off wall is 111.0m deep. Such a deep cut- In order to study the seismic safety of anti-seepage system of asphalt concrete core rockfill dam with deep overburden in strong earthquake area, the three-dimensional finite element model is established on the basis of this project, and the sub-model technology is used to analyze the anti- Seepage system for accurate simulation calculation and analysis of the anti-seepage system on the acceleration, dynamic displacement and dynamic stress distribution of the reaction that the asphalt concrete core rockfill dam impermeable system in the earthquake process is safe, with better Seismic performance.