混凝土面板堆石坝的一种坝坡修整算法

An algorithm for slope paving of concrete faced rockfill dams

基于混凝土面板堆石坝面板施工的实际情况,指出了通常混凝土面板堆石数值计算在模拟面板施工算法上的缺陷。提出了面板堆石坝竣工期上游坝坡修整力学问题,建立了一种适合平面问题和三维问题的统一坝坡修整算法,对任何采用接触模型模拟垫层料和混凝土面板受力特性的有限元计算模型,都具有普遍意义,并在有限元软件ABAQUS中实现了该算法。算例分析表明:该算法简洁和有效,能够保持良好的网格形态,使接触非线性计算收敛速度极大改善,并使蓄水状态下混凝土面板和坝体计算结果更趋于真实。同时,对考虑堆石料流变特性,研究施工阶段或蓄水后混凝土面板与垫层之间是否会发生"脱空"现象提供必要基础。

Based on investigating the construction situation of concrete faced rockfill dams（CFRDs）, the weakness to simulate the slab construction in FE analysis is pointed out; then the correct definition to pave upstream slope is given. An algorithm for slope paving is presented for 2D/3D FE analysis. The algorithm will play an important role in the simulation of mechanical characteristics between the concrete slab and special cushion zone by using the contact model with friction; and the paving-slope algorithm in ABAQUS by using User Subroutine are proposed and implemented. The examples show that the algorithm for slope paving is simple and valid; it will speed up the convergence for solving contact problems; and it can keep finite element mesh well. The results of the stress-displacement in slab and in dam will become more precise. The algorithm can provide a foundation for the investigation if there will be a gap between the slab and special cushion zone or not when the creep in rockfill material is considered.