基于钻孔摄像及示踪技术的上部远距离采空区有害气体下泄验证方法
Validation Methods of Upper Long Distance Goaf Harmful Gas Discharge Based on Drilling Camera and Tracer Technolog
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摘要: 针对特厚煤层放顶煤工作面采动影响下,上部远距离采空区有害气体是否下泄并对工作面上隅角气体浓度产生影响的疑惑,提出了利用钻孔摄像及示踪气体技术联合验证的方法。研究结果表明:特厚煤层综放工作面岩层垮落高度呈台阶状上升,垮落高度远大于普通综采工作面;工作面回采至100 m时,上部岩层垮落高度可达190 m,工作面初次来压后,远距离上部采空区有害气体经垮落裂隙下泄至工作面采空区,最终影响工作上隅角有害气体浓度;钻孔摄像结合SF6气体示踪技术可准确判定远距离采空区有害气体对回采工作面的影响,为工作面有害气体防治提供技术支持。Abstract: In view of the doubt about whether the harmful gas in the upper remote goaf area is discharged and influences the gas concentration at the corner of the working face under the influence of mining in the top-coal caving working face in extremely thick coal seam, a method of joint verification by borehole photography and tracer gas technique is proposed. The results show that the collapse height of strata in fully mechanized caving face of extra-thick coal seam rises in a step-like manner, and the collapse height is much higher than that of ordinary fully mechanized caving face; when the working face is mined to 100 m, the collapse height of the upper rock layer can reach 190 m. After the first pressure of the working face, the harmful gas in the upper goaf is discharged to the working face goaf through the collapse crack at a long distance, ultimately affecting the concentration of harmful gas in the upper working corner; drilling and photography combined with SF6 gas tracer technology can accurately determine the influence of harmful gas in long distance goaf on the working face, which provides technical support for the prevention and control of harmful gas on the working face.
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Keywords:
- borehole camera /
- tracer technology /
- long-distance goaf /
- strata caving height /
- gas discharge
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