深部大采高工作面覆岩“三带”发育高度实测
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摘要
新街矿区红庆河煤矿开采深度在600m以上,顶板岩层较软,其单轴抗压强度仅30～40MPa,煤层厚度大,采高达到6m。为了掌握红庆河煤矿深部3-1煤层偏软顶板条件下大采高工作面覆岩破坏发育高度,采用改进型封隔器进行了井下仰孔测漏试验。测试结果表明,采高6m时,冒落带高度达到43.5m,冒采比7.25;导水裂隙带高度106.1m,裂采比17.7。该研究可为红庆河煤矿深部大采高开采水害防治及顶板控制等方面提供实测依据。
The mining depth of Hongqinghe Mine in Xinjie Mining Area was over 600 m.The roof strata was soft,whose uniaxial compressive strength was only 30～40 MPa,and its coal thickness was large,the mining height achieved about 6 m.In order to grasp the overlying rock destruction and growth height of 3-1 coal seam at Hongqinghe Mine,under the condition of soft roof and large mining height,the modified packer was used for underground upward-inclined borehole's leakage test.The test results showed that when the mining height was 6 mthe height of caving zone was 43.5 m,the pick-up ratio was 7.25,and the height of water flowing fractured zone was 106.1 m,the fracture-recovery ratio was 17.7.The study can provide experimental basis for Hongqinghe Mine in the aspects of water disasters prevention and roof control.
The mining depth of Hongqinghe Mine in Xinjie Mining Area was over 600 m.The roof strata was soft,whose uniaxial compressive strength was only 30～40 MPa,and its coal thickness was large,the mining height achieved about 6 m.In order to grasp the overlying rock destruction and growth height of 3-1 coal seam at Hongqinghe Mine,under the condition of soft roof and large mining height,the modified packer was used for underground upward-inclined borehole's leakage test.The test results showed that when the mining height was 6 mthe height of caving zone was 43.5 m,the pick-up ratio was 7.25,and the height of water flowing fractured zone was 106.1 m,the fracture-recovery ratio was 17.7.The study can provide experimental basis for Hongqinghe Mine in the aspects of water disasters prevention and roof control.
引文
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