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快掘工作面定向长钻孔孔中综合物探超前探测关键技术

Key technologies of comprehensive borehole geophysical prospecting for advanced detection in directional long boreholes of fast excavation working face

  • 摘要: 煤炭资源高效智能化开采的发展对地下隐蔽致灾因素的精准探查提出了更高的要求。如何快速精确探查掘进工作面前方煤岩界面、地质构造和含水异常体是快速掘进亟待解决的关键问题。针对施工空间小、电磁干扰大、异常距离远等问题,将钻探与物探相结合,提出了掘进前方孔中综合超前探测体系。围绕提高径向远探测距离、实现高精度异常成像的目标,利用钻孔瞬变电磁技术开发了基于波场反变换的拟声波介质的虚拟波动场全波形反演算法和三分量空间定位算法,实现了孔旁隐伏含水异常体反演立体成像;针对钻孔雷达探测,提出了波速精准测定、基于钻孔轨迹的煤岩界面及构造空间约束偏移成像等方法。为突破单一探测方法及装备无法全面解释预测掘进前方隐蔽致灾因素的局限性,研制了集成钻孔瞬变电磁、雷达和伽马3种方法的多参数多分量孔中综合探测仪,分析了不同频率电磁波探测的相互影响,开发了具有多孔对比、多参数联动分析功能的多源数据解释平台,通过数据融合解译,提高解释精度和岩性分辨率,减少多解性,形成成套孔中超前探测判识系统。现场应用表明,钻孔综合物探超前探测技术适用于快速掘进,一趟钻可实现超千米钻孔径向30 m的精准探查,大幅提高了巷道快速掘进超前探查效率和精度,为煤矿绿色高效开发提供强有力的地质支撑。

     

    Abstract: The efficient and intelligent production in coal mining necessitates more precise detection of hidden underground disaster-causing factors. Rapid excavation faces challenges in the accuracy and efficiency of detecting coal-rock interfaces, geological structures, and water-bearing anomalies ahead of the working face. To address issues such as limited construction space, strong electromagnetic interference, and long distance detection anomalies, this study proposes an integrated advanced borehole detection system combining drilling and geophysical methods for areas ahead of tunneling. To enhance radial long distance detection range and anomaly imaging precision, a virtual wavefield full-waveform inversion algorithm for pseudo-acoustic media based on wavefield inverse transformation and a three-component spatial positioning algorithm were developed. These enable borehole Transient Electromagnetic (TEM) methods to achieve intelligent inversion and 3D imaging of concealed water-bearing anomalies near the borehole. Innovative techniques were also introduced for borehole radar, including an in-situ method for determining coal-seam radar wave velocity and a spatially constrained migration imaging method guided by borehole trajectory, significantly improving the identification accuracy of coal-rock interfaces and geological structures. To overcome the limitations of single-method detection, a multi-parameter, multi-component integrated borehole detector was developed, combining borehole TEM, radar, and natural gamma methods. The compatibility of simultaneous multi-frequency electromagnetic wave detection was verified. A multi-source data fusion and interpretation platform with multi-borehole comparison and multi-parameter linkage analysis functions was established. This platform enhances geological interpretation accuracy and lithological resolution through collaborative data inversion, reducing interpretation ambiguity and forming a complete intelligent borehole advance detection and identification system. Field applications demonstrate that this technology is suitable for rapid excavation in coal mining. It enables precise detection within a radial range of 30 meters over advance distances exceeding 1000 meters in a single drilling run. This effectively resolves the conflict between exploration and excavation sequences, significantly improves roadway driving efficiency and safety, and provides robust geological support for the green and high-efficiency development of coal mines.

     

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