复杂地质条件下近距离煤层群开采瓦斯涌出特征及治理技术研究  

Gas Emission Characteristic and Control Technology for the Mining of Close-Distance Seam Group Under Complex Geological Conditions

作　　者：徐刚 牛航宇 赵海波 孟凡林 张开加 XU Gang;NIU Hangyu;ZHAO Haibo;MENG Fanlin;ZHANG Kaijia(College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an,Shaanxi 710054,China;China Coal Technology and Engineering Group Shenyang Research Institute,Shenyang,Liaoning 113122,China;State Key Laboratory of Coal Mine Safety Technology,Shenyang,Liaoning 113122)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西部矿井瓦斯智能抽采工程研究中心,陕西西安710054 [3]中煤科工集团沈阳研究院有限公司,辽宁沈阳113122 [4]煤矿安全技术国家重点实验室,辽宁沈阳113122

出　　处：《矿业研究与开发》2024年第8期157-164,共8页Mining Research and Development

基　　金：国家重点研发计划项目(2018YFC0807805);陕西省自然科学基础研究计划资助项目(2019JM-072)。

摘　　要：高瓦斯近距离煤层群开采条件下,邻近层煤层厚度、层间距变化显著,导致瓦斯涌出具有较强的不均衡性,已成为工作面瓦斯治理的难题。以邵寨煤矿2502工作面为研究对象,通过理论分析与数值模拟研究了下伏煤岩体裂隙带的破坏深度及演化特征,在分析下邻近层煤层瓦斯运移规律的基础上提出了复杂地质条件下近距离煤层群开采瓦斯涌出量计算方法,并对瓦斯涌出量进行了预测和区域划分。根据瓦斯涌出量预测结果,针对性地提出以“底板下向穿层钻孔+高位钻孔及上隅角插管”的方法抽采下邻近层卸压瓦斯及采空区瓦斯,实现瓦斯抽采分区域治理。结果表明:邵寨煤矿2502工作面可划分为3个瓦斯涌出区域,最大瓦斯涌出量分别为34.74,14.66,29.86 m^(3)/min。在进行瓦斯抽采分区域治理后,底板穿层钻孔抽采效果良好,回风流和上隅角瓦斯体积浓度稳定下降,未出现突变现象,综合治理效果良好,有力地保证了工作面的安全回采。Under the mining condition of close-distance seam group and high gas,significant changes in the thickness and spacing of adjacent coal seams lead to strong unevenness in gas emission,which has became a difficult problem for gas control in working faces.Taking the 2502 working face of Shaozhai Coal Mine as the research object,the failure depth and evolution characteristics of the underlying coal rock fracture zone were studied through theoretical analysis and numerical simulation.Based on the analysis of the gas migration law of adjacent coal seams,a calculation method for the gas emission quantity of close-distance seam group mining under complex geological conditions was proposed,and the gas emission quantity was predicted and divided into regions.Based on the prediction results of gas emission,a targeted method was proposed to extract depressurized gas from below adjacent layers and gas from goaf using drilling through floor,high-level drilling,and upper corner pipe insertion,achieving regional control of gas extraction.The results show that the 2502 working face of Shaozhai Coal Mine can be divided into three gas emission regions,with maximum gas emission quantity of 34.74,14.66,and 29.86 m°/min,respectively.After the regional control of gas extraction,the drilling through floor has a good effect on gas extraction,and the volume concentration of gas in the return airflow and upper corner decrease steadily without sudden changes.The gas control technology has a fine comprehensive control effect,effectively ensuring the safe mining of the working face.

关 键 词：近距离煤层群 瓦斯涌出量 邻近层 分区治理 抽采方案 

分 类 号：TD712.53[矿业工程—矿井通风与安全] TD712.622