金平沥青混凝土心墙堆石坝三维有限元数值分析

Three Dimensional FEM Numerical Study on Jinping Rockfill Dam with Asphalt Concrete Core

采用三维数值计算方法对金平沥青混凝土心墙堆石坝进行了仿真分析。计算中采用Duncan-ChangE-B双曲线模型作为大坝堆石体及沥青混凝土心墙的本构模型,并根据施工进度模拟大坝的施工、蓄水过程。分析了不同工况下堆石体及沥青混凝土心墙的应力变形。根据计算分析可得结论:金平沥青混凝土心墙堆石坝其堆石体的材料强度满足要求,不会被剪坏;大坝内沥青混凝土心墙发生水力劈裂的可能性不大;心墙的稳定性能够满足规范要求等。

Asphalt concrete core dam is a kind of inhomogeneous nonlinear divisional-embankment layer-rolling spatial composite structure and all along is difficult to be calculated and simulated by FEM. In this paper, 3D FEM is adopted to calculate and simulate the stress and deformation of Jinping rockfill dam with asphalt concrete core during its completion stage and impoundment stage. Duncan-Chang E-B model is used to describe the relation between the stress and the strain of the rockfill and the asphalt concrete core. According to dam construction timing, the process of dam construction and water level rising is simulated. Through computing and analysis, some beneficial solutions are drawn. It is assuredly helpful to well know these characteristics for either proper design of rockfill dam with asphalt concrete core or reasonable construction.