摘要
通过对厚松散层及超薄覆岩的含、隔水层及基岩风氧化带工程岩组性质的分析,采用相似模拟试验与数值模拟等手段研究不同采放比条件下覆岩最大冒高和有效导水高度。研究结果表明:基岩风氧化带内粘土矿物含量高、渗透能力差、再生隔水能力强,具有阻止和抑制导水裂高发展的双重作用,采动后覆岩呈整体弯曲缓慢下沉运动,有效导水裂隙带的发育高度与冒落带高度基本一致。研究结果应用于芦岭矿810#采区,在防水煤柱内进行放顶煤开采,经过两个工作面的成功试采,已安全采出煤炭约40×104t,采出率达86.7%,取得了显著的经济效益。
Based on the analysis of petrofabric property of engineering in thick loose bed, water-bearing strata and water-resisting layer in ultrathin overlying strata, as well as weathered zone in basement rock, the maximum height of caving zone of overlying strata and the effective height of water flowing-fracture zone in the condition of different caving ratios are studied by using the model test of simulated material and numerical simulation. The results show that the content of clay minerals in weathered zone of basement is relatively high, which results in weak permeability and strong regenerated water tightness, which is of double functions of water tight and restrain of continuous development of the height of water flowing-fracture zone under mining conditions. The overlying strata bend wholly and sink slackly, and the effective height of water flowing-fractured zone is in accordance with the caving zone height of overlying strata. The study results are applied to the caving area 810# of Luling mine. The top-coal caving mining is done in waterproof coal pillars, in which experimental exploitation is successful in two working faces. The sum of 4×105 t coal is produced safely, and the recovery ratio is up to 86.7%, so that significant economical benefits are obtained.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第20期3494-3497,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
安徽省优秀青年科技基金(2001年№36)资助课题
