A coupled THMC modeling application of cemented coal gangue-fly ash backfill
A coupled THMC modeling application of cemented coal gangue-fly ash backfill
复制标题
煤矸石-粉煤灰胶结充填体的THMC耦合模拟应用
DOI：
10.1016/j.conbuildmat.2017.10.009
复制
发表时间：
2018-01
影响因子：
7.4
通讯作者：
Di Wu;T. Deng;Runkang Zhao
中科院分区：
文献类型：
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作者：
Di Wu;T. Deng;Runkang Zhao
以煤矸石、粉煤灰、水泥和水为原料制备胶结煤矸石-粉煤灰充填体。在煤矿采空区填入CGFB混合物，用于地面控制和废物处理。一旦置于地下，CGFB的性能将受到热(T)、水力(H)、机械(M)和化学(C)过程以及THMC耦合效应的影响。了解THMC对CGFB的耦合影响对于预测CGFB的行为至关重要。本文建立了一个THMC耦合模型来描述和分析CGFB中发生的耦合THMC过程。所建立的模型考虑了热传导和对流、流体流动、吸力发展、化学收缩、热膨胀和粘结剂水化的过程。将所建立模型的仿真和预测结果与3个实例的实验测试数据进行了比较。模拟结果与实验数据吻合良好，验证了所建立的模型能够很好地表征四氢甲烷耦合载荷下CGFB的特性。模拟结果也有助于更好地设计稳定、耐用和环保的CGFB结构。
Cemented coal gangue-fly ash backfill (CGFB) is prepared by mixing coal gangue, fly ash, cement and water. The CGFB mixtures are filled into mined-out areas of coal mines for ground control and waste disposal. Once placed underground, the performance of CGFB is subjected to the thermal (T), hydraulic (H), mechanical (M) and chemical (C) processes and THMC coupling effects. Understanding the coupled THMC influence on CGFB is crucial for predicting the behavior of CGFB. This paper develops a THMC coupling model to describe and analyze the coupled THMC processes that occur in CGFB. The developed model considers the courses of thermal conduction and convection, fluid flow, suction development, chemical shrinkage, thermal expansion, and binder hydration. The simulation and prediction results of the developed model are compared with the experimentally tested data from 3 case studies. Good agreement is found between the modeling results and experimental data, validating the capability of the developed model to well characterize the properties of CGFB under coupled THMC loadings. The modeling results can also contribute to a better design of stable, durable and environment-friendly CGFB structures.