李雅庄煤矿水力压裂切顶技术应用研究

Research on application of hydraulic fracturing roof cutting technology in Liyazhuang Coal Mine

针对李雅庄煤矿工作面上隅角悬顶面积过大以及巷道超前段动压显著等技术难题,采用水力压裂切顶技术,使顶板岩层产生裂隙,破坏顶板岩层完整性,工作面回采后上隅角能够及时垮落,减小悬顶面积。工程实践表明,通过在工作面2-6112巷上隅角顶板应用水力压裂切顶试验,实现了上隅角顶板的及时垮落且周期来压步距缩短在10 m内,上隅角的悬顶面积小于10 m^2。从而转移了顶板应力,减弱了两巷超前动压,最终实现了顶板卸压,保障了李雅庄煤矿的安全生产。

In view of the technical problems such as the excessive overhanging area of the corner of the working face of Liyazhuang Coal Mine and the significant dynamic pressure of the leading section of the roadway,using hydraulic fracturing and cutting technology,hydraulic fracturing causes cracks in the roof rock layer and destroys the integrity of the roof rock formation.After the working face was recovered,the upper corner could be collapsed in time to reduce the ceiling area.Engineering practices show that:by applying the hydraulic fracturing topping test on the top corner of the 2-6112 working face,the timely collapse of the upper corner roof was achieved and the cycle step was shortened within 10 m.The ceiling area of the upper corner was smaller than 10 m 2.Thereby transferring the stress of the roof,weakening the forward dynamic pressure of the two lanes,and finally achieving the pressure relief of the roof,which ensures the safe production of the Liyazhuang Coal Mine.