Study on the development law of water conduction fracture zone in close distance coal seams mining under goaf
The water conduction fracture zone was one of the main channels for the water source of coal seam roof flowing into the working face.It was of great significance to master the development of the'three zones'of overlying rock for the control of mine water disaster.The No.8 and No.9 coal seams in Dongfeng Coal Mine were typical close distance coal seams,and the roof limestone aquifer was the main source of water inflow.Therefore,the similar model and field measurement method were used to study the development law of the'three zones'of the overlying strata in No.9 coal seam mining.The similar simulation study showed that the mining of No.9 coal seam could cause further collapse of the overlying strata,and the development range of the fracture zone was 30～58 m.The measured study of the double-end plugging and leakage measurement method showed that the development range of the fracture zone was 28.7～55.5 m.The test results could provide reference for the prediction and control of water inflow in No.9 coal seam mining.The similar simulation results were basically consistent with the measured results,and the similar simulation could accurately predict the migration law of overlying strata under the influence of repeated mining.
water conduction fracture zoneclose distance coal seamssimilar simulation
国家科技期刊平台
NSTL
万方数据
维普
