Coal and rock mass linkage induced impact mechanism and prevention and control rock burst in steeply-inclined and extremely-thick coal seam group
CUI Feng1，2，3，ZHANG Suilin1，2，LAI Xingping1，2，CHEN Jianqiang4，JIA Chong1，2，FENG Ganggui1，2，SUN Jingxuan1，2
(1. College of Energy Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；2. Key Laboratory of Western Mines and Hazard Prevention of Ministry of Education，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；3. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization，Ministry of Natural Resources，Xi?an，Shaanxi 710021，China；4. Xinjiang Energy Co.，Ltd.，National Energy Group，Urumqi，Xinjiang 830027，China)
Abstract：In view of the serious dynamic disaster caused by the hanging of the rock pillar and roof during the mining of steeply-inclined and extremely-thick coal seam group，by using comprehensive theoretical analysis，field monitoring and other research methods，a mechanical model of the rock pillar and roof was built and the expression representing the bending moment and energy evolution law of the rock pillar and roof was deduced，the law of the bending deformation and energy evolution of the rock pillar and roof with the increase of mining depth was studied，the impact risk of different coal seams was evaluated，the induced impact mechanism was analyzed，and the anti-impact strategy and scheme were put forward. The results show that：(1) with the increase of mining depth，the bending deformation and energy accumulation of rock pillar and roof in steeply-inclined and extremely-thick coal seam group show nonlinear acceleration changes，and the bending deformation is more serious and the energy accumulation is higher in the mining stage. After the mining depth of 300 m，the energy increased sharply，and it was determined that the mining depth was the critical value of impact disaster. (2) Rock pillar pry and energy accumulation in B1+2 coal seam mining are smaller than those in B3+6 coal seam mining，and the impact risk in B1+2 coal seam mining is smaller than that in B3+6 coal seam mining. Compared with the rock pillar，the bending deformation of B3+6 coal seam roof is more serious and the energy accumulation is higher. (3) Determine the impact prone area as the superposition position of each stress peak. The sources of impact force include static load and dynamic load，and static load is the basic condition of impact，which is the energy storage function. The dynamic load is the induced impact，and the dynamic and static loads act together to induce the impact. (4) The key to prevent scour is to weaken the static load. It is necessary to strengthen prevention and control in B3+6 coal seam mining. The key prevention and control objects are rock pillars and roof， and the key prevention and control areas are the superposition positions of stress peaks. After the rock pillar and roof blasting was carried out on site，the static load level was effectively weakened after the coal was injected with water，and the anti-scour control effect was good. The above research results provide a scientific basis for the prevention and control of rock burst disasters in steep and thick coal seam mining in Wudong Coal Mine.
崔 峰1，2，3，张随林1，2，来兴平1，2，陈建强4，贾 冲1，2，冯港归1，2，孙敬轩1，2. 急倾斜巨厚煤层组开采煤岩体联动诱冲机制与防冲调控[J]. 岩石力学与工程学报, 2023, 42(S1): 3226-3241.
CUI Feng1，2，3，ZHANG Suilin1，2，LAI Xingping1，2，CHEN Jianqiang4，JIA Chong1，2，FENG Ganggui1，2，SUN Jingxuan1，2. Coal and rock mass linkage induced impact mechanism and prevention and control rock burst in steeply-inclined and extremely-thick coal seam group. , 2023, 42(S1): 3226-3241.
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2023, Vol. 42 
