摘要
近距煤层开采时,若下煤层工作面回采巷道布置不合理,可能导致上煤层煤柱的瞬时失稳,造成动力冲击事故的发生。以平朔安家岭井工二矿近距离煤层开采为工程背景,建立近距煤层开采相似模型,研究下煤层开采时诱发上煤层煤柱的能量激增峰值的临界条件,从而确定下煤层工作面回采巷道的合理位置。研究结果表明,由于来自上覆岩层的压力大面积地积聚到煤柱上,使得煤柱内的应变能剧烈激增,则开采下煤层时上煤层煤柱能量积聚程度要大于上煤层开采阶段。同时,开采下煤层时,工作面回采巷道布置在距上煤层煤柱8 m以外为宜。巷道表面位移和地质雷达探测现场监测结果显示,当下煤层回采巷道距离上煤层煤柱大于8 m时,掘进过程中巷道没有出现变形破坏,位移收敛较为稳定,可以满足工作面回采需要。
Due to the stress concentration of coal pillar arranged in the upper coal seam during the extraction of closed coal seam,the accumulated energy in coal pillar could induce coal bump in the mining face and roadway if the position of roadway was unreasonably arranged and designed. Based on the geological condition of No.2 coal mining in Anjialing,the physical model was established to determine the energy release in coal pillar during extraction of closed coal seam and investigate the reasonable position of mining roadway in the under coal seam. It was suggested from the physical model and field test that degree of energy release during the extraction of under coal seam was greater than that of upper coal seam. The reason was that the stress concentration of coal pillar induced by the movement of overlying rock strata was serious during the extraction of under coal seam. The physical model revealed that the reasonable distance between roadway and coal pillar was approximate greater than 8 m. The field test results obtained from roadway displacement and the geological radar suggested that the roadway was stable when the reasonable distance was greater than 8 m.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期4023-4029,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226801)
国家自然科学基金资助项目(41502184)
中国矿业大学(北京)大学生创新训练项目(201411413054)
关键词
采矿工程
近距煤层
应变能
煤柱
回采巷道
现场监测
mining engineering
closed coal seam
strain energy
coal pillar
mining roadway
field monitoring
