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ZHANG Defei, ZHANG Qinglin, ZHANG Hongwei, LU Zhiguo, ZHENG Yangfa, FAN Mingjian. Study on surrounding rock control technology for mining roadway of ultra-deep protective layer[J]. COAL SCIENCE AND TECHNOLOGY, 2021, 49(2): 45-51. DOI: 10.13199/j.cnki.cst.2021.02.006
Citation: ZHANG Defei, ZHANG Qinglin, ZHANG Hongwei, LU Zhiguo, ZHENG Yangfa, FAN Mingjian. Study on surrounding rock control technology for mining roadway of ultra-deep protective layer[J]. COAL SCIENCE AND TECHNOLOGY, 2021, 49(2): 45-51. DOI: 10.13199/j.cnki.cst.2021.02.006

Study on surrounding rock control technology for mining roadway of ultra-deep protective layer

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  • Available Online: April 02, 2023
  • Published Date: February 24, 2021
  • The stability control of the mining roadway in the 1 300 m ultra-deep protective layer of Huafeng Colliery is a bottleneck problem affecting the safe and efficient production of the mine.Based on the comprehensive testing of on-site geomechanics and the study of the specific failure mechanism of surrounding rock,a combined support plan of ultra-high-strength heat-treated pre-stressed bolt with cable-grouting is proposed.The 700 MPa grade ultra-high-strength heat-treated bolt was developed with reaking strength of 850 MPa and an impact absorption power of 100 J;underground industrial test was firstly carried out in the 1 300 m deep coal mine roadway.The monitoring of multi-parameter changes such as roadway bolt support force,four-point roof separation and surrounding rock borehole stress was carried out on site,and the analysis obtained:under the disturbance of blasting excavation,the overall surrounding rock deformation is basically stable after a distance of 80 m from the front of the ultra-deep roadway;however,the deep stress of the surrounding rock still creeps for a long time and exhibits a large-scale increase and decrease cycle.The test results showed that,compared with the roof full-anchor cable support method,the mining face deformed ahead of the entire roadway.Reduce by 50%,and increase the efficiency of excavation support by 20%.
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