顶板浅部裂隙通道与钻进信号的关系

以顶板浅部岩层为研究对象，对钻孔施工过程中变推力水平的钻进反馈信号以及钻深-钻速特征进行现场试验研究，结果表明：钻削区内钻进速度与推力水平近似线性正相关，不同岩性其钻速增长率不同，泥岩层在阻塞区内钻速负增长；在2.5～3.5 kN推力水平下，钻进速度在煤层、泥岩层、砂岩层中依次递减；试验矿井顶板煤层处于钻削区内，平均钻进速度为41.8～43.2 mm/s，波动幅度为-4.07%～3.01%；砂岩层平均钻进速度为8.4～9.8 mm/s，波动幅度为-16.3%～19.0%；泥岩层内平均钻进速度为22.4～23.5 mm/s，波动幅度为-28.1%～24.3%；顶板泥岩层完整性差，在1.1～1.3，2.7～2.8，4.1～4.4 m各存在一裂隙通道，通道处钻进速度波动幅度最大可达122.3%；钻深-钻速特征曲线可以明显表征裂隙通道位置。

The relationship between roof shallow crack channel and drilling signals

Taking roof shallow strata as the research object，the field test research on the drilling feedback signal of variable thrust level in drilling construction process and the characteristics of drill deep drill speed，the results showed that：in drilling area drilling speed and thrust level are approximate linear positive correlation.As lithology different its drill speed growth rate is different.In blocking of the mudstone layer the drill speed is negative growth.Under 2.5-3.5 kN thrust level，the drilling speed in the coal seams，mudstone layer and sandstone layer decreases in turn.The coal seam roof of test coal mine is in the drilling area，The average drilling speed is 41.8-43.2 mm/s，fluctuation is -4.07%-3.01%；The average drilling speed in sandstone is 8.4-9.8 mm/s，fluctuation is -16.3%-19.0%；The average drilling speed in mudstone is 22.4-23.5 mm/s，fluctuation is -28.1%-24.3%；The integrity of roof mudstone is poor，there is a fissure channel in each range of 1.1-1.3，2.7-2.8 and 4.1-4.4 m，the fluctuation of drilling speed in channel is up to 122.3%；the characteristic curve of drilling depth drilling speed can clearly characterize the location of fissure channel.