Numerical analysis of THM coupling of a deeply buried roadway passing through composite strata and dense faults in a coal mine

摘要

Because of the reduction in shallow-buried coal resources, increasingly coal mines in China extend to deep resources. The coupling of thermal-hydro-mechanical (THM) fields is much more complicated in deep strata, especially when the roadway passes through composite strata and dense faults. High ground pressures, high ground temperature and high seepage pressure are most important features of deep strata. In order to investigate the THM coupling mechanism of deeply buried roadways, this article presents the geological features of deep strata and analyzes the interactions among thermal, hydraulic and mechanical fields considering the water-weakening effect of the surrounding rock. Finally, the THM coupling process of a deeply buried roadway passing through composite strata and dense faults is simulated. The deformation characteristics and distribution of the stress field are described in the results.