Abstract:

 Similarity model test and numerical simulation were combined to analyze failure characteristics of the overburden and the laws of ground subsidence, which was induced by mining of the underlying Ordovician limestone nappe aquifer. The comparative analysis of empirical formula, numerical simulation, and similarity model test shows that under this special geological condition, without the consideration of the influence of seepage, the height of water flowing in a fractured zone and caving zone is 14.0~19.1 times and 2.2~ 4.5 times of mining thickness, respectively; when the influence of seepage is taken into account, the height of water flowing in a fractured zone and caving zone increases to 20.6 times and 4.8 times of mining thickness, respectively. Therefore, from the safety perspective, the influence of seepage should be considered in the process of actual mining, and the height of water flowing in a fractured zone with seepage-stress field coupling is more reasonable for designing safety coal (rock) pillars.

Key words: Huangqiaoarea;seismicprofiles;structuralcharacteristics;inversionstructure;forwardmodeling;oilandgasexploration