15112工作面坚硬顶板水力压裂技术研究与应用

Research and Application of Hydraulic Fracturing Technology for Hard Roof of the 15112 Working Face

为弱化15112工作面回采期间出现大面积悬顶,采用UDEC数值模拟软件进行水力压裂裂缝扩展规律的分析,得出裂隙扩展长度和张开量均与注水压力成正比;结合坚硬顶板的赋存特征进行水力压裂方案设计,并对实施效果进行分析。结果表明:水力压裂方案实施后,支架工作阻力和顶板来压步距均大幅降低,坚硬顶板弱化效果显著。

In order to weaken the large area hanging roof during the mining period of the 15112 working face,the law of hydraulic fracturing fracture propagation is analyzed by using UDEC numerical simulation software,and it is concluded that the fracture propagation length and opening are proportional to the water injection pressure,combined with the occurrence characteristics of hard roof,the hydraulic fracturing scheme is designed,and the implementation effect is analyzed.The results show that after the implementation of the hydraulic fracturing scheme,the working resistance of the support and the pressure step distance of the roof are greatly reduced,and the weakening effect of the hard roof is obvious.