• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International conference on ground control in mining >CBM Extraction Engineering Challenges and the Technology of Mining the Upper Protective Seam in the Daxing Mine, China
【24h】

CBM Extraction Engineering Challenges and the Technology of Mining the Upper Protective Seam in the Daxing Mine, China

机译：大兴煤矿煤层气抽采工程面临的挑战和上保护层开采技术

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

With the increase of mining depths, deep-seated coal seams face threats from high ground stresses, high gas pressures, high gas content, and low seam permeability, which significantly increase the likelihood of coal and gas outbursts. Challenges continue to grow in coalbed methane (CBM) extraction fields, especially for short-distance gassy multiple-seams. Research has proved that the most effective way to increase coal seam permeability is to decrease the ground stress. Protective seam mining technology is a surrounding rock control technology, which can effectively reduce the ground stress and increase the permeability of the protected coal seam. In this paper, we try to use upper protective seam mining technology to simultaneously extract coal and gas. Findings are based on a FLAC3D simulation of stress variation during the mining of the No. 12 coal seam in the Daxing coal mine, Tiefa Coalfield, China. Results indicate that, after mining the upper protective seam, the pressure-relief effects of the rock mass generated three belts and five zones below the protective seam, providing the space and time for gas pre-extraction engineering. Within the protected area, the numerical simulation indicates that the stress of the No. 13/14 coal seam reduces 95.84% and 88.25% respectively, while the expansion deformation of the protective seams reach 6.87 ‰ and 6.70 ‰ respectively, which demonstrate that the protective mining technology can provide a significant pressure-relief effect to the outburst-prone coal seam. Combining stress relief in this manner with pressure-relief from engineered gas drainage (performed by crossing boreholes from the floor rock roadway) applied before the mining of the protective seam, it would not only be beneficial to CBM drainage but also can reduce the gas outburst risk of the protected seams.
机译：随着开采深度的增加，深层煤层面临着来自高地应力，高气压，高瓦斯含量和低煤层渗透率的威胁，这大大增加了煤与瓦斯突出的可能性。煤层气（CBM）开采领域的挑战不断增加，特别是对于短距离瓦斯多煤层而言。研究证明，增加煤层渗透性的最有效方法是降低地面应力。防护煤层开采技术是一种围岩控制技术，可以有效降低地应力，提高被保护煤层的渗透性。在本文中，我们尝试使用上部保护性煤层开采技术来同时开采煤和瓦斯。这些发现基于FLAC3D模拟，该模拟是在中国铁法煤田大兴煤矿12号煤层开采过程中应力变化产生的。结果表明，开采上部保护层后，岩体的卸压效应在保护层下方产生了三个带和五个区域，为天然气预抽采工程提供了空间和时间。数值模拟表明，在保护区内，13/14煤层的应力分别减小了95.84％和88.25％，而保护层的膨胀变形分别达到了6.87‰和6.70‰，说明了保护层的安全性。采矿技术可以为易突出的煤层提供显着的卸压效果。以这种方式将应力释放与在开采保护性煤层之前施加的工程化瓦斯抽放的泄压相结合（通过穿越地层岩石巷道的井孔进行泄压），不仅有利于煤层气抽放，而且可以减少瓦斯突出受保护接缝的风险。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号