Research On The Deformation And Failure Law Of Stope Floor Based On Multi-parameter Response Characteristics

With the continuous development and improvement of our country’s economy,society and industrial level,the demand for coal resources is also increasing day by day,and the reserves of easy-to-mine coal resources in the shallow and upper groups are gradually depleted.The storage condition of deep coal seam is complex,and under the serious threats of water hazard,so it’s difficult to mine.The destruction of the coal seam floor caused by mining is an important factor that causes water inrush from the floor.Therefore,it has important practical significance to study the failure law of coal seam floor under mining conditions.The paper summarized the theories and research methods of coal seam floor failure at home and abroad,and relying on a working face in the Zhungeer mining area in Inner Mongolia,distributed optical fiber and resistivity CT method integrated detection were arranged in the coal seam floor by drilling and implanting.The system conducts field tests on the failure process of the floor,and then elaborately explains the depth of the failure of the floor of the working face under mining conditions and the depth of the disturbance.Among them,the distributed optical fiber monitoring results show that the maximum damage depth of the coal seam floor is 15m,and the maximum damage disturbance depth is 36m.The monitoring results of the resistivity CT method show that the maximum destruction depth of the coal seam floor is 12m,and the maximum destruction perturbation depth is 30m.Comprehensive analysis shows that the depth of the coal seam floor failure zone is 15m,and the maximum disturbance depth is 36m.Research shows that:distributed optical fiber and resistivity CT method both show good applicability in detecting the depth of coal seam floor failure.Among them,distributed optical fiber has advantages in detection accuracy.Resistivity CT method is effective and intuitive in the integrity of underground rock formations.The combination of the two methods can more comprehensively reflect the characteristics and laws of the deformation and failure of the stope floor,and provide a reliable basis for the prevention and control of the mine floor water damage and the determination of the stope’s spatial stability.Figure [44] Table [8] Reference [84]...