Study on anti-impact effect of hydraulic fracturing for long holes in medium and high thick hard roof

In view of the insufficient pressure relief effect of thick hard roof of 3106 working face in Menkeqing Coal Mine, the key layer inducing roof shock of 3106 working face was determined by the active strata of micro-seismic high-energy events monitored in the field and theoretical analysis. The long-...

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Bibliographic Details
Published inMei kuang an quan Vol. 54; no. 7; pp. 69 - 77
Main Author SUN Ruda, XIA Yongxue, GAO Jiaming
Format Journal Article
LanguageChinese
Published Editorial Office of Safety in Coal Mines 01.07.2023
Subjects
hard roof
long hole hydraulic fracturing
pressure relief effect test
regional pressure relief
rock burst
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Summary:In view of the insufficient pressure relief effect of thick hard roof of 3106 working face in Menkeqing Coal Mine, the key layer inducing roof shock of 3106 working face was determined by the active strata of micro-seismic high-energy events monitored in the field and theoretical analysis. The long-hole hydraulic fracturing technology was proposed and applied in the field, and the fracturing effect and pressure relief effect were analyzed and evaluated. The results show that the sandstone layer with the average height of 59.33 m and the thickness of 49.95 m from the coal seam is the key layer to induce shock. After hydraulic fracturing, the fracture surface is prefabricated in the key layer, the water content in the fracture increases, the continuity of apparent resistivity is enhanced, and the resistance reduction phenomenon appears. Hydraulic fracturing weakens the integrity and strength of the key layer, and the micro-seismic energy is released into “high frequency and low energy”. The average occurrence d
ISSN:1003-496X
DOI:10.13347/j.cnki.mkaq.2023.07.009