综采工作面水力压裂切顶卸压留巷技术

Hydraulic Fracturing Roof-cutting and Pressure-relief Roadway Retaining Technology in Fully Mechanized Mining Face

为保证10-103综采工作面留巷巷道的稳定性,采用定向水力压裂技术进行留巷作业。通过分析水力压裂原理,得出当最小主应力方向接近于垂直方向时,需在钻孔内预切槽保证水力压裂效果。根据10-103工作面的具体情况,对水力压裂切顶方案进行设计,并进行矿压观测。结果表明:水力压裂后,巷道顶底板移近量降低50%,两帮移近量降低30%,卸压效果明显。

In order to ensure the stability of the retained roadway in the 10-103 working face,directional hydraulic fracturing technology is used to retain roadway.By analyzing the principle of hydraulic fracturing,it is concluded that when the direction of minimum principal stress is close to the vertical direction,it is necessary to pre-cut grooves in the borehole to guarantee the effect of hydraulic fracturing.According to the specific working conditions of the 10103 working surface,the hydraulic fracturing roof cutting scheme was designed in detail,and the mine pressure was observed.The results show that the roof-to-floor convergence decreases by 50%,and that of two sides reduces by 30%after hydraulic fracturing.The effect of pressure relief is obvious.