高土石坝填筑过程的精细化模拟方法

Detailed simulation method for filling process of high earth and rockfill dams

土石坝在所有坝型中一直占据着重要的地位,在高土石坝建设中结合实际碾压情况的填筑过程模拟,对土石坝的安全建设和长期稳定具有重要的指导意义。为更加精细地模拟土石坝的填筑施工与蓄水过程,其有限元计算的网格尺度目标应为与填筑厚度相当的米级。当前进行土石坝米级网格大规模计算的主要难点在于网格剖分、总体刚度矩阵的存储及并行计算方法、方程求解等。在C编程语言的框架下采用逐步加密方法实现了土石坝米级网格剖分,改进了总刚存储与计算、有限元求解等过程,最后采用1 m级网格对一典型的200 m心墙堆石坝进行了填筑过程模拟,计算结果符合土石坝的一般规律。

Earth and rockfill dams have always played an important role in all types of dams. In the construction of high earth and rock dams, combining with actual rolling compaction conditions filling process simulation have important guiding significance for the safety construction and long-term stability of earth and rock dams. In order to simulate the filling and impounding process of earth and rock dam more precisely, the mesh size of finite element calculation should be the size of meters equal to the thickness of filling. At present, the difficulties in large-scale calculation of earth and rockfill dams include mesh subdivision, storage and parallel calculation of total stiffness matrix, and equation solving. Under the C programming framework, this paper uses the mesh refinement method to complete the grid subdivision of larger scale calculation, and the programming language, total stiffness storage and calculation, finite element equation solution and other processes of the static calculation program have been improved to complete the larger scale finite element method simulation of earth and rockfill dams. The filling process of a typical core wall rockfill dam with a height of 200 m is simulated under the mesh size of 1 m. The simulation results conform to the general rules.