Numerical modeling and validation for 3D coupled-nonlinear thermo-hydro-mechanical problems in masonry dams
Numerical modeling and validation for 3D coupled-nonlinear thermo-hydro-mechanical problems in masonry dams
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DOI：
10.1016/j.compstruc.2016.10.007
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发表时间：
2017
影响因子：
4.7
通讯作者：
L. Nguyen-Tuan;Carsten Knke;V. Bettzieche;T. Lahmer
中科院分区：
文献类型：
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作者：
L. Nguyen-Tuan;Carsten Knke;V. Bettzieche;T. Lahmer
在这篇文章中，我们介绍了一个完全耦合的热-水-力（THM）模型描述的物理现象存在于砌体材料。对某大坝蓄水过程中的THM问题进行了三维数值模拟。耦合THM分析的结果进行了验证，在该过程中记录的瞬态位移，孔隙水压力和温度值的测量。数值模拟结果与实测数据吻合较好，表明THM耦合模型能够较好地再现砌石坝的多物理性态。此外，本文介绍了一个大型系统的平衡方程的解决方案，结合并行计算，存储在压缩稀疏行格式，迭代预处理共轭梯度平方法，以提高计算成本。
We introduce in this article a fully coupled thermo-hydro-mechanical (THM) model describing the physical phenomenon present in masonry materials. A series of 3D numerical simulations are carried out for the THM analysis of a dam during its impounding process. The results of the coupled THM analyzes are validated with measurements recorded during that process in terms of transient displacement, pore-water pressure and temperature values. An agreement between numerical simulations and measured data proves that the coupled THM model can well reproduce the multi-physical behavior of masonry dams. Furthermore, we introduce herein a solution for a large system of balance equations by combining parallel computation, storage in Compressed Sparse Row format, and iterative pre-conditioned Conjugate Gradient Squared method in order to improve the computational cost.