岩土工程学报2024，Vol.46Issue(12)：2570-2579,10.DOI:10.11779/CJGE20230892
深部大采高综采面厚硬岩层-煤柱结构失稳诱冲机理研究
Mechanism of instability induced scour of thick hard rock-coal pillar structure in deep fully mechanized working face with large mining height
摘要
Abstract
The instability-induced rockburst of thick hard rock stratum-coal pillar structure is a typical rockburst mode in Ordos deep mining area,and its mechanism is still unclear.Taking the 30202 working face of a mine in Ordos deep mining area as the engineering background,the instability-induced rockburst mechanism of thick hard rock stratum-coal pillar structure in deep fully mechanized mining face with large mining height is studied by means of the theoretical analysis,numerical simulation and field measurement,and the following conclusions are drawn:The spatial movement characteristics of thick hard rock stratum-coal pillar structure in deep fully mechanized mining face with large mining height are discussed.The mechanism of instability-induced impact of the thick and hard rock stratum-coal pillar structure is revealed,i.e.,the foundation stress of the section coal pillar comes from the self-weight of the in-plane thick and hard rock stratum group and the adjacent mined-out area,when it reaches the strength limit,the in-plane thick and hard rock stratum breaks in a"W"shape and transmits additional stress,and when the superimposed stress of the section coal pillar exceeds its failure threshold,local or even whole instability impact occurs.It is found through the numerical simulation that the load transmitted by the"W"-shaped twice breaking motion of the thick and hard strata group is the main stress source of the instability impact of the coal pillar near the working face.The control system of instability-induced impact of the thick hard rock stratum-coal pillar structure in deep fully mechanized mining face with large mining height is designed and implemented,including strong unloading of bearing coal pillar,strong support in disturbed areas and strong control of advancing speed.The effectiveness evaluation verifies that the anti-impact system can ensure the safe mining of the working face.关键词
冲击地压/厚硬岩层/区段煤柱/微震监测Key words
rockburst/thick hard rock stratum/section coal pillar/microseismic monitoring分类
矿业与冶金引用本文复制引用
张翔,曲效成,朱斯陶,姜福兴,刘金海,朱权洁,史先锋,韩刚,魏晓虎,曹京龙..深部大采高综采面厚硬岩层-煤柱结构失稳诱冲机理研究[J].岩土工程学报,2024,46(12):2570-2579,10.基金项目
国家重点研发计划项目(2022YFC3004604) （2022YFC3004604）
国家自然科学基金面上项目(52374076) （52374076）
中国科协青年人才托举工程项目(2021QNRC001) （2021QNRC001）
