Rockburst mechanism and the law of energy accumulation and release in mining roadway:a case study
Feng Du1
Ji Ma2
Xiaofei Guo3
Tianfeng Wang3
Xiaohang Dong4
Jiashuo Li4
Shulei He3
Dilinaer Nuerjuma3
1.Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology(Beijing),100083 Beijing,China;State and Local Joint Engineering Laboratory for Gas Drainage&Ground Control of Deep Mines,Henan Polytechnic University,454003 Jiaozuo,Henan,China2.State and Local Joint Engineering Laboratory for Gas Drainage&Ground Control of Deep Mines,Henan Polytechnic University,454003 Jiaozuo,Henan,China;School of Safety Science and Engineering,Henan Polytechnic University,454003 Jiaozuo,Henan,China3.Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology(Beijing),100083 Beijing,China4.School of Safety Science and Engineering,Henan Polytechnic University,454003 Jiaozuo,Henan,China
摘要：The rockburst dynamic disasters in the process of deep coal mining become more and more serious.Taking the rockburst occurred in the 23130 working face of Yuejin Coal Mine as the engineering background,we study the characteristics of mining stress field around roadway,the plastic failure morphological characteristics of surrounding rock and the accumula-tion/release law of elastic energy before and after burst.An analysis model quantitatively describing the physical process of rockburst in the mining roadway is established,and the calculation method of dynamic release of elastic energy in the physical process of rockburst is educed.The mechanism of rockburst in mining roadway is revealed.The results show that an"L-shaped"stress concentration zone is formed within 100 m of the 23130 working face,and the principal stress ratio of the surrounding rock of the transportation roadway is 2.59-4.26.The change of the direction of the maximum principal stress has a significant effect on the burst appearance characteristics.The failure strength of different sections of the mining roadway is characterized by the elastic energy release value.With the increase of the working face distance,the elastic energy released by burst failure and the expansion variation of failure boundary radius show a nonlinear variation law that tends to decrease steadily after sharp fluctuation.The closer to the working face,the higher the burst risk.At a distance of 10 m from the working surface,the maximum principal stress reaches its maximum value.The butterfly-shaped failure system generated by the surrounding rock of the roadway has energy self-sustainability,and the elastic energy released by the sudden expansion of the butterfly leaf is enough to cause a burst damage of 1.9 magnitude.This work could provide theoretical support for the prediction and prevention of rockburst.
机标关键词：mechanismenergystudycaseaccumulationminingreleaseroadway
论文发表日期：2022-10-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：17( 96-112 )
英文信息