基于流固耦合的底板阻水效应沉积控制机理

o research the water resistance effect of coal floor with different strata combination, coal floor of lower coal group in Huaibei mining area was regarded as research object and three different models of coal floor combination were built. FLAC3D software was secondary developed based on FISH language then the mining stress of coal floor of different combined features and permeability of surrounding rock were analyzed. The results show: the depth of coal floor mining stress transition point gets deeper under the condition of fluid-solid coupling than the depth without considering the bottom water pressure condition meanwhile there is pressure relief phenomenon in the deep coal floor. The degree of pressure relief and decreasing amplitude of stress transition point of hard-soft type coal floor are the largest while which of the soft alternate with hard type coal floor are smallest. Permeability of hard-soft type coal floor is increased 4.5 times while which of soft alternate with hard type coal floor is only increased 1.4 times. The research results reveal water resistance effect of soft alternate with hard type coal floor is best while hard-soft type coal floor is poorest.