On the Influence of the Location of Deep Concealed Fracture Zone on Water Inrush from Floor of Working Face
The concealed structure of stope floor is an important factor causing water inrush in working face.Taking 2125 working face of Xingdong Coal Mine as an example,this paper studies the interaction between floor mining failure characteristics and hidden fracture zones in deep mining process,establishes a mechanical model,simulates and compares the evolution characteristics of mining stress and floor failure characteristics in different spatial locations of hidden fracture zones in mining process with numerical software.Results show that the spatial location and shape of the concealed fracture zone are the key factors of water inrush.When the vertical distance between the concealed fracture zone and coal seam is within 80 m,the stress release speed of the concealed fracture zone is faster,and the concealed fracture zone is easy to be affected by coal seam mining.When the vertical distance increases to 120 m,the hidden fracture zone is less disturbed by the mining face.However,when the concealed fracture zone is perpendicular to the coal seam at 120 m,after the working face pushes through the fracture zone,the stress value of the concealed fracture zone begins to adjust and release,and communicates with the stress reduction area of the floor.When conditions are available,lagging water inrush is easy to occur,so the floor rock strata should be reinforced by grouting in time.
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