| 关键层结构对保护层卸压开采效应影响分析 |
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| 引用本文： | 涂敏,付宝杰.关键层结构对保护层卸压开采效应影响分析[J].采矿与安全工程学报,2011,28(4):536-541. |
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| 作者姓名： | 涂敏 付宝杰 |
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| 作者单位： | 安徽理工大学能源与安全学院,煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 |
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| 基金项目： | 国家自然科学基金项目(51074004); 安徽省自然科学基金项目(11040606M102); 安徽理工大学博士基金项目 |
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| 摘 要： | 由于保护层卸压开采,导致覆岩结构的运动,致使上覆煤层变形,产生卸压效应,改变被卸压煤层的透气特性,为卸压瓦斯抽采创造有利条件.采用RFPA2D-Flow数值模拟软件,分析了上覆煤岩层采动裂隙演化、卸压煤层采动应力及位移分布、瓦斯参数变化等规律,结果表明:1)下保护层开采引起的上覆煤岩层采动裂隙集中分布在采场两端部,并呈竖向偏采空区方向发育,离层裂隙发育至被卸压煤层上方;2)开切眼和停采线附近区域顶板裂隙明显发育,卸压开采导致上覆煤层产生膨胀变形,透气性明显增加;3)由于被卸压煤层和保护层之间关键层结构的力学效应,使被卸压煤层透气系数增加幅度不显著,导致抽采孔瓦斯压力降低速度放缓.无关键层结构时,采动影响区内抽采孔瓦斯压力降低较快.
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| 关 键 词： | 关键层结构 保护层开采 卸压效应 数值模拟分析 |
Analysis of the Effect of Key Strata Structure on Relief-Pressure Mining in Protective Seam |
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| TU Min,FU Bao-jie.Analysis of the Effect of Key Strata Structure on Relief-Pressure Mining in Protective Seam[J].Journal of Mining and Safety Engineering,2011,28(4):536-541. |
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| Authors: | TU Min FU Bao-jie |
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| Affiliation: | TU Min,FU Bao-jie(School of Energy and Safety,The Key Laboratory of Coal Mine Safety and High Efficiency Mining of Cosponsored by Province and MOE,Anhui University of Science and Technology,Huainan,Anhui 232001,China) |
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| Abstract: | Relief-pressure mining of the protective seam can cause the movement of overlying strata,lead to relief-pressure effect by deformation of the upper coal seam,change the permeation properties of protected seam,and create favorable conditions for gas drainage in pressure releasing area.In this paper,by adopting numerical simulation software of RFPA2D-Flow,we analyzed the regularities of mining-induced fractures evolution,stress and displacements distribution,and gas parameters change,et al,in the upper protec... |
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| Keywords: | key strata structure protective mining relief-pressure effect numerical simulation analysis |
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