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地质异常区突出能量单元切割理论及灾害防控技术研究进展

Research on Energy Unit Cutting Theory and frontier technologies for disaster prevention and control in geological abnormal areas of coal mines

  • 摘要: 煤矿地质异常区因高地应力、高瓦斯压力、低渗透性及构造煤发育等特征,成为煤与瓦斯突出的高风险区域。针对现有防突技术易引发煤层应力叠加、卸压不充分及瓦斯抽采效率低等难题,首次提出了地质异常区突出能量单元切割理论,并研发配套的卸压增透技术及装备。主要成果如下:提出以突出潜能分布和能量阈值判据为核心的能量单元切割理论,将地质异常区煤层划分为高/低能级单元,通过介质切割阻断能量链式传递路径,研发了气(液)动冲孔与可控定向聚能爆破(注)协同增透技术,实现单元内部应力再平衡及瓦斯能量梯度释放;以原位煤系软岩具有静水压倾向性为前提,发明了地质异常区煤层原位地应力探测技术,结合钻机钻进输出能量、钻屑量与钻屑粒度分布,获得地应力的原位能量大小;利用2D可见光相机、高分辨率3D飞行时间(ToF)相机等多路视频以及九轴姿态传感器的多模态实时感知技术,研发了三路高清多模态随钻视觉探测装置,融合多源钻孔数据,建立可视化钻孔三维动态模型,可精准探测地质异常区赋存情况;基于矿用防爆螺杆空压机,研发了气‒液两相协同冲孔卸压技术,将气动压力提高到2 MPa,发明了风水转化装置,集成高压水射流与气动脉冲技术,解决了软硬复合煤层钻孔过程中的抱钻、顶钻、堵孔、排渣慢等难题,将瓦斯抽采浓度提升1倍,单个钻孔瓦斯抽采周期显著延长;揭示了冲孔‒爆破协同增透机制,冲孔孔洞为爆破提供自由面与煤体运移空间,爆生裂隙与孔周环向裂隙网贯通形成渗透通道。现场应用表明,定向聚能爆破30 d后地质异常区残余瓦斯含量降低到3.9 m3/t以下,钻屑瓦斯解吸指标远低于突出临界指标,显著降低地质异常区突出危险性,煤巷掘进速度每月增加20 m以上。

     

    Abstract: Geological anomaly areas in coal mines, characterized by high in-situ stress, elevated gas pressure, low permeability, and the development of tectonic coal, represent high-risk areas for coal and gas outbursts. Existing outburst-prevention techniques often suffer from stress superposition, insufficient pressure relief, and low gas drainage efficiency. To address these challenges, this study proposes for the first time the energy unit cutting theory for geological anomaly areas, accompanied by the development of pressure-relief and permeability-enhancement technologies and equipment. The main contributions are as follows: An energy unit cutting theory was established based on outburst potential distribution and energy threshold criteria, dividing coal seams in abnormal areas into high- and low-energy units. By cutting the medium to block chain-type energy transfer pathways, a cooperative permeability-enhancement technology integrating pneumatic (or hydraulic) slotting and controllable directional shaped-charge blasting was developed, achieving intra-unit stress rebalancing and staged gas energy release. Considering the hydrostatic tendency of in-situ coal-measure soft rock, a novel in-situ stress detection method was invented. By coupling drilling energy input, cuttings yield, and particle size distribution, the magnitude of in-situ stress was quantified. Furthermore, a tri-modal real-time sensing device was developed, integrating 2D visible-light cameras, high-resolution 3D time-of-flight cameras, and nine-axis attitude sensors. Fusing multi-source borehole data, a dynamic 3D visualization model of boreholes was established for precise detection of geological anomalies. Based on an explosion-proof screw air compressor, a gas–liquid two-phase collaborative slotting technology was developed, raising pneumatic pressure to 2 MPa. A wind–water conversion structure was invented to integrate high-pressure water jetting with pneumatic pulsing, effectively solving borehole sticking, bit jamming, blockage, and poor cuttings removal in complex soft-hard coal seams. This doubled the gas drainage concentration and significantly prolonged the effective drainage period per borehole. The mechanism of slotting–blasting cooperative permeability enhancement was revealed: slotting provides free surfaces and migration space for blasting, while blast-induced fractures interconnect with circumferential slotting fractures to form a permeable network. Field applications demonstrated that, 30 days after directional shaped-charge blasting, residual gas content in abnormal areas decreased below 3.9 m3/t, and cuttings desorption indices were well below critical outburst thresholds. Consequently, outburst risk was significantly reduced, and roadway advance rates increased by more than 20 meters per month.

     

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