Study On The Development Law Of Water-Conducting Fracture Zone Of Weakly Cemented Rock Mass In Yushuling Mine

Due to the simple geological structure,shallow burial,and weakly cemented strata of Jurassic and Cretaceous overlying rocks in the western mine,the mine’s large-scale and high-intensity fully-mechanized caving mining conditions have caused the groundwater level in the mining area to drop,mine water inrush,and ecological environment degradation.and other problems,and the migration law of overlying rock caused by high-intensity mining is different from that in the eastern mining area,and there are characteristics such as wide expansion and large variation of fracture development.Prediction of fracture height.Therefore,in order to study the development law of the water-conducting fracture zone in Yushuling Mine,this thesis analyzes the physical and mechanical properties of the coal-rock mass in Yushuling Mine,Kuqa County,Xinjiang by means of theoretical analysis,physical similarity simulation,numerical simulation,field measurement and other research methods.The characteristics of the weakly cemented strata were obtained;the breaking law of the overlying rock and the development height of the water-conducting fracture zone were obtained;the previous empirical formula was revised through theoretical analysis.The main conclusions of this study are as follows:（1）On the basis of arranging and analyzing mine geological data,the physical and mechanical parameters such as compressive,tensile and shear strength of coal seam and roof strata were measured through field sampling and laboratory tests;The microstructure of sandstone and siltstone in China is analyzed,and the characteristics of weakly cemented rock formations in the basic top and key layers are summarized.（2）A physical similarity model was established according to the similarity criterion,and the fracture law of the direct top,basic top and weakly cemented key layers of the 110501 working face was obtained by simulating the mining process,and the evolution law and final development height of the water-conducting fracture zone were obtained.（3）The FLAC^3D numerical simulation scheme under different advancing distances is designed,and the development of the overlying plastic zone,the displacement characteristics and the stress distribution characteristics during the advancing process are analyzed,and the development law of the water-conducting fracture zone is obtained.（4）In Yushuling Mine,the vertical hole water injection lateral leakage method was used to measure the development height of the water-conducting fissure zone,the layout plan of the borehole was designed,the data of water injection leakage was collected,and the development of the pre-mining and post-mining fissure zone was analyzed and studied.height and characteristics.（5）Comprehensively compare the development heights of water-conducting fractured zones obtained under different research methods,collect and analyze the measured data of the heights of water-conducting fractured zones in mines under the same weakly cemented strata,and fit and correct the existing empirical formulas to obtain suitable Elevation prediction formula of Yushuling Coal Mine.The thesis has 59 figures,17 tables,and 93 references.