Influence of Hydraulic Fracturing of Thick Jurassic Sandstone on Hydrogeological Conditions of Working Face Roof
To investigate the impact of the hydraulic fracturing key layer engineering on the hydrogeological condi-tions of the roof in the 63-06 working face of Dongtan Coal Mine,comparative analysis of the changes in hydrogeo-logical conditions was carried out using methods such as water fracture zone height detection,tracer testing,geo-physical exploration,drilling,and water monitoring.The results show that the fracturing cracks have damaged the mudstone water barrier in the middle of the Jurassic,and changed the water filling mode of working face roof.Frac-turing water and water in the upper and lower sections of the Jurassic sandstone become water sources,going through fracturing cracks,resulting in an increase in the water inflow of working face.Fracturing water has a short-term impact on the increase of water inflow in the working face,while water in the upper Jurassic sandstone has a long-term impact.Scientific arrangement of drainage systems,appropriate design of fracturing drilling positions,fracturing layers,and fracturing intensity can effectively prevent the risk of secondary water damage to the roof caused by hydraulic fracturing projects.The research results will benefit the prevention of roof water damage in sim-ilar engineering disturbed working faces.
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