摘要
为准确测定瓦斯抽采有效半径确定合理的抽采钻孔布置间距,对传统的测压法钻孔布置方式进行了适当改进。在同一水平高度,分组布置间距不等的测压孔与抽采孔,通过观测各组钻孔瓦斯压力变化情况确定有效抽采半径,并在亭南煤矿进行现场试验。由压降曲线可知,抽采初期,抽采孔周围一定范围内的瓦斯呈线性渗流,随抽采时间延长,逐渐趋于低速非线性渗流,整个曲线压强与时间基本上呈幂函数关系。抽采40 d时有效半径达4 m,抽采半径达5 m以后,抽采影响范围不再继续扩大。
In this paper, to accurately measure the effective radius and identify the reasonable ar- rangement of drainage borehole spacing, the arrangement of drilling holes in the traditional gas pressure measurement were improved appropriately. In the same height, unequal spacing of pressure measure- ment boreboles and drainage holes were arranged separately, the effective extraction radius was then determined by monitoring the gas pressure changes in different borehole groups, and the field test was practiced in Tingnan coal mine. The stress drop curves show that the gas around the drainage holes flows in a state of linear seepage in the early drainage period, then gradually turns to low-speed nonlin- ear seepage with extraction time prolonged, while the gas pressure and extraction time basically shows power function correlation in the whole curve. Moreover, the effective drainage radius reaches to 4 me- ters after 40 days gas extraction, and the influence scope of gas drainage expands no longer after the ra- dius up to 5 meters.
出处
《采矿与安全工程学报》
EI
北大核心
2013年第1期132-135,142,共5页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2011CB201206)
大型油气田及煤层气开发国家重大专项基金项目(2011ZX05040-2)
关键词
有效半径
瓦斯压力
瓦斯抽采
压降曲线
effective radius gas pressure
gas drainage
stress drop curve
