煤炭工程 ›› 2019, Vol. 51 ›› Issue (8): 44-47.doi: 10.11799/ce201908011

• 施工技术 • 上一篇    下一篇

松软破碎煤体瓦斯抽采钻场预加固技术研究与应用

张镇1,孙永新2,付玉凯1,王涛3   

  1. 1. 天地科技股份有限公司开采设计事业部
    2. 山西天地王坡煤业有限公司
    3. 天地科技股份有限公司开采设计事业部巷道所
  • 收稿日期:2018-07-03 修回日期:2019-01-30 出版日期:2019-08-20 发布日期:2019-09-09
  • 通讯作者: 张镇 E-mail:ccrizhen@126.com

Study and Research on Pre-reinforcement of Soft and Breaking Coal Mass in Gas Drainage Drilling Field

  • Received:2018-07-03 Revised:2019-01-30 Online:2019-08-20 Published:2019-09-09

摘要: 针对松软破碎煤体施工大直径长距离瓦斯抽采钻孔容易出现塌孔、卡钻导致钻孔失效的难题,采用理论分析、现场测试和井下试验的方法,通过煤岩体强度和结构探测,得出了煤岩体的结构完整性和强度,并根据围岩特点确定了注浆机理以粘结松软煤体、增强松软煤体整体性为主,适当增加煤体强度,达到防止钻孔塌孔的目的,在此基础上设计了注浆加固参数和单孔全长分段注浆工艺,该工艺施工工程量小,工艺简单,加固速度快。井下试验表明,煤岩体注浆加固后围岩强度增加57%,完整性提高58.8%,钻孔无塌孔出现,有效保证了长钻孔的顺利实施。

关键词: 松软破碎煤体, 瓦斯抽采钻孔, 全长分段注浆, 预加固

Abstract: According to the problem of large diameter and long-distance gas drainage drilling borehole failure with hole collapse and sticking in soft and breaking coal mass, the theoretical analysis, field test and underground test were used in this paper, the structural integrity and strength of coal mass were obtained by in-situ strength and structural test. Based on the results, the grouting mechanism of soft coal bonding, soft coal integrity and strength enhancing were proposed, the grouting parameters and full-length piecewise grouting technique were designed, this process was simple and fast. It is tested underground that the coal mass strength was increased by 57% and the integrity increased by 58.8%.