Study On Overburden Failure Law Of Mechanized Caving Under Half Consolidated Sandstone Aquifer

Water cut loose sandstone layer is special in Jurassic strata of Mesozoic strata occurrence state,easily happened in the mining process of roof with catastrophic collapse disasters such as collapse,water sand;Aiming at this problem,this paper carried out the xinjiang region Mesozoic semi-solid sandstone aquifer damage and migration regularity of fully-mechanized mining,in order to improve in the geological conditions of the corresponding safe efficient level.Based on the first Sha Ji Hai coal mine mining face B10 overburden of coal seam as the research object;Through the preliminary exploration of knowledge of the experimental area of geological structure,hydrological and coal seam occurrence condition and mining technical conditions;Through the drilling geological data statistical analysis,and application of overburden rock mechanics performance test method to determine the B10 overburden strata of coal seam type;Through the analysis of the geochemical characteristics of strata,summarizes the geological characteristics of the region;At last,by using engineering analogy and numerical simulation,similar material simulation and on-site drilling test method that combines B10 damage rule of overlying strata after coal seam mining are studied,reveals the regional strata in full-mechanized caving mining under the condition of damage rule,has been clear about the thick layer of continuous loose sandstone sedimentary water cut this special strata structure the important influence to the strata destruction rules of full-mechanized caving mining.Thesis research deepening the research on the coal mining technological system under water cut loose sandstone,fills in the xinjiang region of full-mechanized caving mining under the condition of the strata damage rule of blank,for similar mining technical conditions of the mine roadway layout in the prevention and control of water,pressure management,and provides a certain reference.