• 中文核心期刊
  • 中国科技核心期刊
  • RCCSE中国核心学术期刊

重复采动覆岩离层井下钻孔注浆充填减沉技术

郑立军

郑立军. 重复采动覆岩离层井下钻孔注浆充填减沉技术[J]. 煤矿安全, 2022, 53(3): 112-119.
引用本文: 郑立军. 重复采动覆岩离层井下钻孔注浆充填减沉技术[J]. 煤矿安全, 2022, 53(3): 112-119.
ZHENG Lijun. Underground borehole-based grouting and filling technology to overburden separation induced by repeated mining for ground subsidence control[J]. Safety in Coal Mines, 2022, 53(3): 112-119.
Citation: ZHENG Lijun. Underground borehole-based grouting and filling technology to overburden separation induced by repeated mining for ground subsidence control[J]. Safety in Coal Mines, 2022, 53(3): 112-119.

重复采动覆岩离层井下钻孔注浆充填减沉技术

Underground borehole-based grouting and filling technology to overburden separation induced by repeated mining for ground subsidence control

  • 摘要: 覆岩离层注浆充填减沉技术是煤矿绿色开采体系中的重要组成部分,以焦作矿区古汉山矿16032下分层工作面覆岩离层注浆充填为工程背景,从综合考虑覆岩结构和地表沉降规律的研究思路出发,提出了根据最大下沉角确定缓斜煤层重复采动覆岩离层水平位置的方法;建立了利用井下已有注浆管路系统、在井下大巷布置钻场和斜上钻孔对工作面覆岩离层进行注浆充填的方法;沿工作面走向布置5个钻场,每个钻场布置3个仰斜钻孔,由下至上分别指向亚关键层下方离层区、亚关键层与主关键层间的软硬岩交互区、主关键层下方离层区,终孔位置位于最大下沉线附近。现场监测结果表明:注浆后地表最大下沉量仅0.3 m左右,有效控制了地面沉降状况。受地层产状稳定性、岩体结构以及岩石物理力学性质测试准确性等的影响,关键层位置及离层靶区的准确识别较为困难;在实施井下覆岩离层注浆时,不仅应参考覆岩关键层位判别结果,还应根据覆岩柱状分阶段多次“钻进-注浆”交替进行的方式探索最合理的离层注浆层位。
    Abstract: Overburden separation layer filling technology for ground surface subsidence control is an important part in the system of coal mine green mining. In this study, by considering the overburden structure and ground surface subsidence law, we propose a method for predicting the horizontal position of overburden separation layer over repeated mining inclined panel according to the maximum subsidence angle. The method of using the underground existing grouting pipeline system, drilling sites in main roadway, and inclined boreholes to fill overburden separation layer is proposed. Five drilling sites are arranged for the panel; in each drilling site, there are three inclined boreholes pointing to the separation layer under the sub-key layer, the soft and hard rock alternating zone between the sub-key layer and the main key layer, and the main key layer, respectively. The end hole is located near the maximum subsidence line. Field monitoring result shows that the maximum subsidence is 0.3 m after filling, indicating the filling technology proposed in this study is effective. Usually, it is difficult to identify the accurate locations of the key layers and the target areas of the separation layer due to the uncertainty of rock occurrence, the complexity of rock mass structure, and the testing accuracy of rock’s physical and mechanical properties. Therefore, when underground borehole-based grouting and filling technology is carried out, reasonable filling targets should be explored by the test processes of alternating drilling and grouting. The study is of significant to provide a reference for other underground borehole-based filling design under similar engineering geological conditions.
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