Study on fault permeability test of deep mine roadway
Roadway fault is an important part of mine water inrush accident.The research on the permeability test method of deep road-way faults in mines provides a theoretical basis for the installation of waterproofing and drainage facilities of deep roadway faults in mines.F15 fault section of the second-level No.31854 working face of in a suburban coal mine of a certain city was selected as the fault section of permeability test.Four test holes were set in this section to test the fault permeability of deep roadway in mines through water injection test.The test results indicated that the smaller the distance between the faults and the lower the mineralization degree,the low-er the content of sodium and potassium ions,and the higher the content of calcium ions,indicating that the fault was a water-conducting fault.With the continuous increase of water injection,the permeability coefficient of each test hole decreased gradually.The seepage re-sistance of the deep roadway fault was lower than that of the normal floor,so it was easier for the deep roadway fault to form a water-con-ducting channel.According to the test results,two important measures to prevent the fault water inrush accident were put forward,inclu-ding reducing the water pressure of the fault aquifer and increasing the seepage resistance strength of the fault zone.
deep in the mineroadway faultpermeability testmineralization degreethe amount of water injectionwater-conducting channel
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