摘要
为了给采空区瓦斯抽放高位长钻孔的设计提供依据,采用相似模拟试验与关键层理论分析采空区顶板产生裂隙、断裂、冒落和离层情况及其变化规律。随工作面的推进,关键层的弯曲变形经历从缓慢→剧烈→缓慢→破断的过程；亚关键层的弯曲下沉范围明显小于主关键层。关键层破断后,其下采空区两侧垫层的弹性变形得到恢复,下沉位移出现反弹。关键层的承载作用和岩层力学特性的差异使关键层间顶板的垮落角不同。覆岩关键层的破断使工作面顶板垮落角减小、周期垮落步距和来压强度都增大。依据覆岩关键层的破断形态、顶板的垮落角和周期来压(垮落)步距可以确定瓦斯抽放钻孔的终孔位置和钻场间钻孔的压茬距离,并预测钻孔的抽放瓦斯效果。
In order to offer references for design of gob gas drainage with high-level long borehole, the laws of gob roof crack generation, fracture, fall and separation layer are analyzed with simulation experiment and key strata theory. Bending deformation of key strata undergoes the course of slowness→acuteness→slowness→fracture with the advance of working face, The bending and subsidence scopes of subordinate key strata are obviously smaller than those of major key strata. The elastic deformation of both side rock strata under key stratum will recover; and their subsidence will rebound after the fracture of key strata. Caving angles of roofs among key strata are different because of the differences of the load-bearing effect of key strata and mechanical characters of rock strata. The fracture of overlying key stratum results in decrease of the roof caving angle and the increase of periodic caving span and weighting intensity. The ultimate position and overlap distance of gas drainage boreholes can be determined based on fracture configuration of key strata, roof caving angle and periodic caving span, and gas drainage effect of boreholes can be also forecasted.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第11期2200-2207,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
教育部博士点基金(20050290503)中国矿业大学青年科研基金(2005A001)
关键词
采矿工程
瓦斯抽放
采空区
顶板冒落
关键层
模拟试验
mining engineering
gas drainage
gob
roof fall
key strata
simulation experiment
作者简介
黄炳香（1978-），男，2004年于西安科技大学能源学院采矿工程专业获硕士学位，现为博士研究生、助教，主要从事岩石力学与矿山压力方面的教学与研究工作。E-mail：huangbingxiang@163．com
