| 涂敏*,付宝杰,缪协兴.卸压开采损伤煤岩气体渗透率试验研究[J].实验力学,2012,27(2):249~253 |
| 卸压开采损伤煤岩气体渗透率试验研究 |
| Experimental Study of Gas Permeability of Injured Coal-Rock When Relieving Mining |
| 投稿时间：2011-06-23 修订日期：2011-10-12 |
| DOI： |
| 中文关键词: 卸压开采 煤岩 气体渗透率 围压 试验 |
| 英文关键词:relieving ming coal-rock gas permeability confining pressure experiment |
| 基金项目:国家自然科学基金资助项目(51074004);国家自然科学基金资助项目(50874103);安徽省自然科学基金资助项目(11040606M102) ;安徽省科技攻关计划(11010401015) |
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| 中文摘要: |
| 我国煤系地层的煤岩体渗透率普遍较低,直接影响煤矿瓦斯抽采效果。卸压开采使采场围岩受采动应力作用具备了峰后力学行为,其渗透率也大幅度增加,有助于瓦斯的高效抽采。本文基于MTS815.02 型电液伺服岩石渗透试验系统,对卸压开采后损伤煤岩的气体渗透率进行了测试。研究表明: (1)卸压损伤煤岩石的渗透率在10-5～10-4m2之间,较受采动影响前要大107~108倍;(2)卸压过程中,煤样的气体渗透率与围压近似呈线性关系,与岩样呈双曲线关系;(3)卸压损伤煤岩逐渐加围压,气体渗透率近似为线性下降,卸压阶段,其渗透率增加;(4)加卸围压对煤岩的气体渗透率有很大影响。研究结果可为卸压瓦斯高效抽采提供理论依据。 |
| 英文摘要: |
| Penetration rate of coal-bearing strata in China is generally low, which affects directly the gas drainage effect of coal mine. Relieving mining makes the stope rock have post-peak mechanical behavior due to the dynamic stress, so the penetration rate increases dramatically which helps to obtain efficient gas drainage. Gas permeability rate of injured coal-rock after relieving mining was experimentally measured based on an electro-hydraulic servo system. Results show: (1) The gas permeability rate of injured coal-rock is in a range of 10-5～10-4 m2, and is 107~108 times large than the original state; (2) In relieving process, the relation between gas permeability and confining pressure of coal sample is nearly linear; that the relation between gas permeability and rock sample is hyperbola. (3) Gradually increasing confining pressure, the gas penetration rate of injured coal-rock declines approximately linearly, while the penetration rate increases at pressure relief stage; (4) The confining pressure variation has a significant impact on the gas permeability. Above results may provide theoretical evidence for efficient gas drainage. |
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