Characteristics of high level borehole deviation and its influence on extraction effect
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摘要: 为研究高位钻孔偏斜对抽采效果的影响,利用钻孔轨迹测量仪对现场高位钻孔实际施工轨迹进行测定并分析其偏斜特征。根据偏孔位置将钻孔分为上偏轨迹钻孔、有效轨迹钻孔、下偏轨迹钻孔、偏向采空区钻孔4类,并分析了各类钻孔抽采效果及特征。结果表明:高位钻孔偏斜严重,有效钻孔数量较少,偏向采空区钻孔所占比例最高;采动影响所形成的裂隙为造成高位钻孔偏斜的主要因素;4类偏斜钻孔抽采效果具有显著规律性及差异性,为高位钻孔优化设计提供了依据;有效轨迹钻孔抽采量最高,约为上偏轨迹钻孔的1.3倍,为下偏轨迹钻孔的2.9倍,为偏向采空区钻孔的4倍,其中偏向采空区钻孔抽采量最小且为无意义抽采。Abstract: In order to study the influence of high level borehole deviation on the extraction effect,borehole trajectory instrument was used to measure the borehole trajectory of high level borehole.Based on the deviation position,this paper divided the boreholes into four categories:upward deviation borehole,effective borehole,downward deviation borehole,and goaf deviation borehole.Then the extraction effect of each category was analyzed.Results show that high level boreholes have a serious deviation,the number of effective borehole is small,and goaf deviation borehole accounts for a significant proportion;fractures caused by mining activities are the main factor of borehole deviation;extraction effect drawings of these four categories boreholes have regularities and differences,which can provide the basis for optimal designs of high level borehole;gas drainage of effective boreholes is the highest and is 1.3 times higher than that of upward deviation boreholes,2.9 times higher than that of downward deviation boreholes,and 4 times higher than that of goaf deviation boreholes;the amount of gas drainage of goaf deviation boreholes is the lowest and meaningless.
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Key words:
- high level borehole /
- borehole deviation /
- borehole trajectory /
- extraction effect
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