摘要
为研究坚硬顶板遗留煤层条件下综放工作面冲击地压发生机理,以宽沟煤矿坚硬顶板遗留煤层下I010203工作面易发生高能量事件的临空巷道为工程背景,通过理论分析、现场监测、数值模拟和工程验证相结合的方法,分析了B_(4)、B_(2)煤层开采过程中覆岩结构特征及演化过程,模拟了不同结构形态下煤岩体应力分布规律,并通过钻孔实测、微震监测和PASAT M探测多种方法进行了验证。研究表明:B_(4)与B_(2)煤层开采后,低位覆岩结构Ⅰ以侧向悬臂的形式加载临空巷道,悬顶长度为18.5~37.5 m,造成临空巷道煤岩体形成应力升高区;随着开采范围增大,覆岩活动空间向上发展,微震事件向上聚集,采空空间逐渐增大,当B_(4)与B_(2)煤层采空区导通后,波及高位覆岩结构Ⅱ,r_(2)岩层运动下沉造成实体侧煤体应力升高区范围扩大、转移,应力集中系数再增大,最终r_(2)岩层破断失稳,结构Ⅰ与结构Ⅱ积聚的弹性能瞬间释放,动静载共同作用达到冲击地压发生的临界条件,造成临空巷道冲击显现。
In order to study mechanism of rock burst in fully mechanized caving face under residual coal seams with hard roof,with near goaf roadway prone to high energy events of working face I010203 under residual coal seams with hard roof in Kuangou coal mine as engineering background,characteristics and evolution process of overburden structure in the mining process of coal seams B_(4) and B_(2) were analyzed through theoretical analysis,field monitoring,numerical simulation,and engineering verification.Stress distribution law of coal and rock mass under different structural forms was simulated and verified with borehole measurement,microseismic monitoring,and PASATM detection methods.The results have shown that after the mining of coal seam B_(4) and B_(2),low overburden structure Ⅰ loads near goaf roadway in the form of lateral cantilever,and the length of suspended roof is 18.5~37.5 m,which causes coal and rock mass in the roadway to form an elevated stress area.As mining area expands,activity space of overlying strata develops upward,microseismic events gather up,and the gob space increases.When the breakover between gobs in B_(4) and B_(2) affects high overburden structure Ⅱ,the sinking of strata r_(2) leads to the expansion and transference of stress elevation zone in solid side coal,the increase of stress concentration factor,and the eventual fracture and instability of strata r_(2),when accumulated elastic energy of structure Ⅰ and structure Ⅱ is released instantaneously,and combined action of dynamic and static loads reaches critical occurrence of rock burst,resulting in the appearance of impact in the heading roadway.
作者
杜涛涛
鞠文君
陈建强
张传玖
李红平
孙如达
DU Taotao;JU Wenjun;CHEN Jianqiang;ZHANG Chuanjiu;LI Hongping;SUN Ruda(Coal Mining Branch,China Coal Research Institute,Beijing 100013,China;China Coal Engineering Mining Research Institute Co Ltd,Beijing 100013,China;Coal Mining&Designing Department,Tiandi Science&Technology Co Ltd,Beijing 100013,China;China Energy Group Shenhua Xinjiang Energy Co Ltd,Urumqi,Xinjiang 830000,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2021年第6期1144-1151,共8页
Journal of Mining & Safety Engineering
基金
国家科技部“科技助力经济2020”重点专项项目(SQ2020YFF0426364)
国家重点研发计划项目(2017YFC0804209)
中国煤炭科工集团有限公司集团产学研项目(2019-TD-2-CXY006)
天地科技“公司其他内部研发项目”开采设计事业部“科技创新基金”项目(KJ-2019-TDKCQN-05)。
关键词
冲击地压
遗留煤层
坚硬顶板
综放工作面
rock burst
residual coal seam
hard roof
fully mechanized caving working face
作者简介
杜涛涛(1984—),男,山东省枣庄市人,副研究员,从事冲击地压防治技术方面的研究。E-mail:864092996@qq.com,Tel:18612985973。
