Analysis of evolution law of dynamic and static load stress in thick coal seam isolated island working face

Zhang Long; Xu Qianhai; Zhang Tianzi; Luo Junli; Fan Baoxian; Liu Qiang; Hou Jijin

doi:10.19896/j.cnki.mtkj.2025.02.015

Abstract：Taking the No.2203 isolated island working face of a certain mine as the research object,the evolution law of dynamic and static load stress was investigated using stress analysis methods;numerical simulation techniques were simulated the stress distribution characteristics during various time periods of the No.2203 working face mining;a multi-factor coupling method was utilized to determine the stress concentration zones during the excavation and mining period of the No.2203 working face,along with delineating the bounda-ries of each stress concentration area.When the 2203 working face is only affected by initial pressure,square,periodic pressure,geolog-ical structure,and other factors,and is not affected by dynamic loads such as high-energy mining earthquakes,the possibility of impact instability of the working face is relatively small.However,after the superposition of dynamic and static load stresses,the instantaneous stress of the coal rock mass is relatively large,and there is a possibility of impact ground pressure.During the mining period of the No.2203 working face,most regions experience a state of pressure relief,with stress concentration zones located at the ends,corners of coal pillars,and near the terminal line;Four high-stress concentration areas and two medium-stress concentration areas exist during excava-tion period of the No.2203 working face,while during the mining period,there are 8 high stress concentration areas and 1 medium stress concentration area.The research results have certain reference significance for the prevention and control of dynamic disasters in similar working faces.