关键层移动对地面瓦斯抽采孔的影响及防护孔对策

发布时间：2018-04-21 21:05

本文选题：瓦斯抽采钻孔 + 关键层　；参考：《煤炭科学技术》2017年05期

【摘要】：为揭示卧龙湖煤矿8101工作面地面瓦斯抽采钻孔受采动影响后破坏引发突水事故的原因,采用理论分析、工程实测手段对覆岩关键层运动特征、抽采钻孔结构、工作面涌水量、钻孔破坏窥视等信息进行了综合分析。结果表明,厚硬关键层破断后其所控制的大范围岩层整体运动造成钻孔套管多段拉伸破坏,抽采钻孔成为直接沟通K3砂岩含水层与下部导水断裂带的主通道,是引发8101工作面持续大量突水的主要原因。地面瓦斯抽采钻孔破坏防护应从采前设计、钻孔施工、采动控制三阶段考虑,采取采前损害预判、钻孔强化防护、采动协调减损的措施,以实现抽采钻孔的长期稳定。
[Abstract]:In order to reveal the causes of water inrush caused by the destruction of surface gas drainage borehole in 8101 working face of Wolong Lake Coal Mine, the characteristics of the movement of key strata of overburden, the structure of drainage borehole and the water discharge of working face are analyzed by theoretical analysis and engineering measurement. The information of borehole damage and peep-view is comprehensively analyzed. The results show that the whole movement of rock layer controlled by the thick and hard critical layer after fracture results in multi-segment tensile failure of borehole casing, and the extraction borehole becomes the main channel for direct communication between K3 sandstone aquifer and the lower water-conducting fault zone. It is the main cause of water inrush in 8101 face. In order to realize the long-term stability of drainage borehole, the prevention of borehole damage by surface gas drainage should be considered in three stages: design before mining, construction of borehole and control of mining movement, and the measures of predetermination of pre-mining damage, reinforcement of protection by borehole and coordinated derogation of mining movement should be taken to realize the long-term stability of drainage borehole.
【作者单位】：中国矿业大学矿业工程学院;皖北煤电集团有限责任公司卧龙湖煤矿;
【基金】：国家自然科学基金资助项目(51404246) 江苏省自然科学基金资助项目(BK20140205)
【分类号】：TD712.6

【相似文献】