摘要
为了研究深部开采动力灾害与钻孔应变之间的联系,通过数值计算分析"孤岛采区"在周边采区开采过程中应力场演变规律以及分布形态,基于钻孔应变理论分析,建立钻孔应变监测预警观测站,耦合分析钻孔应变与区域开采矿震活动规律,验证钻孔应变监测可靠性。研究表明:开采扰动导致"孤岛采区"应力场演变形成环向应力集中区,应力集中随开采范围增大而增大,随时间增加而减弱;正断层对开采应力集中区传递有减弱作用,煤柱能够降低应力传递效应;钻孔应变监测显示,采场活动、矿震事件都会引起应变监测曲线的相应变化,通过钻孔应变监测技术可以应用于监测矿山区域应力场调整的监测和动力灾害的预警。
In order to study the relationship between the dynamic disaster of deep mining and borehole strain,the evolution law and distribution pattern of stress field in the mining process of "isolated island mining area" are analyzed by numerical calculation.Combined with numerical calculation and analysis of the evolution law and distribution pattern of stress field in the surrounding mining area of "isolated island mining area",a monitoring and early warning observation station for borehole strain is established,coupled with the analysis of the law of borehole strain and regional mining mine earthquake activity,to verify the reliability of borehole strain monitoring.The results show that the mining disturbance causes the stress field of "isolated island mining area" to evolve into a circumferential stress concentration area,and the stress concentration increases with the increase of mining area and decreases with the increase of mining time;the fault has an isolation effect on the mining stress transmission,and the coal pillar can reduce the stress transmission effect;the borehole strain monitoring shows that both the mining activity and the mine earthquake event will cause the corresponding change of strain monitoring curve.It can be used to monitor the adjustment of the stress field in the mining area and to forewarn the dynamic disaster.
作者
鲁细根
余小妹
孟沼河
夏磊
LU Xi-gen;YU Xiao-mei;MENG Zhao-he;XIA Lei(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Human Settlements and Civil Engineering,Nanchang Institute of Science and Technology,Nanchang 330108,China;Baodian Coal Mine,Shandong Yanzhou Coal Mining Co.,Ltd.,Zoucheng 273512,China)
出处
《煤炭技术》
CAS
北大核心
2021年第12期174-178,共5页
Coal Technology
关键词
动力灾害
钻孔应变
区域应力场
开采扰动
监测预警
dynamic disaster
borehole strainmeter
regional stress field
mining disturbance
monitoring and early warning
