定向水力压裂技术在晋城矿区坚硬顶板中的应用  

Application of Directional Hydraulic Fracturing Technology in Hard Roof in Jincheng Coal Mining Area

作　　者：马赛[1] 陶广美[1] 马晋琴[1] 

机构地区：[1]山西晋煤集团技术研究院有限责任公司,山西晋城048006

出　　处：《矿业安全与环保》2016年第2期84-86,94,共4页Mining Safety & Environmental Protection

摘　　要：针对晋城矿区15#煤顶板致密坚硬、强度高,不能随工作面回采及时垮落的问题,以15#煤坚硬K2石灰岩顶板为研究对象,运用定向水力压裂技术致裂顶板,通过理论分析、数值模拟与现场实践,结果表明:水力压裂裂纹扩展方向趋向于垂直最小主应力方向;定向水力压裂后,工作面顶板初次垮落步距与周期来压步距有所减小,且来压强度低,与爆破法相比,有明显改善;工作面巷道两帮移近量与顶底板移近量控制在安全使用范围之内,与爆破法相比,变形量有较大幅度减小;工作面上隅角顶板悬顶面积大大减小,解决了瓦斯积聚带来的安全隐患。To counter to the problems of NO. 15 coal seam's roof which is dense,hard,high strength and unable to cave in time with the advance of the working face in Jincheng Coal Mining Area,in this paper,by taking the hard K2 limestone roof of No. 15 seam as the object,study was carried out on theses roof problems by using the directional hydraulic fracturing technology and through theoretical analysis,numerical simulation and field practice. The results showed that the extension direction of the hydraulic fracturing fissures tended to be perpendicular to the direction of the minimum principal stress; after the directional hydraulic fracturing technology was applied,the first caving step distance and the periodic weighting step distance of the face roof reduced and the weighting strength was low,compared with the blasting method,it got obvious improvement; the displacement of the face roadway two sides and the roof-to-floor convergence were all controlled within a safe range,compared with the blasting method,the deformation was greatly decreased; the hanging roof area at the upper corner angle of the working face was greatly reduced,this solved the safety hidden danger caused by gas accumulation.

关 键 词：坚硬顶板 定向水力压裂 初次来压 周期来压 变形量 瓦斯积聚 

分 类 号：TD327.23[矿业工程—矿井建设]