Huaihe Energy Holding Group Co., Ltd.

针对潘二矿采区系统巷道受工作面回采多次采动影响巷道严重变形难以维护的问题,采用数值模拟、理论分析、现场试验相结合的方法,提出了顶板岩层水力压裂切顶卸压护巷技术,并进行了工程实践。结果表明:在工作面采动应力影响范围外超前对顶板坚硬岩层进行水力压裂,顶板岩层在高压水的作用下发生拉破坏,产生水力裂缝,高压水使水力裂缝与原有裂隙贯通,在保压作用下不断扩展,在顶板坚硬岩层中形成明显的人工裂缝,破坏了顶板岩层的完整性,阻断了采动应力在岩层中的传递,减小了超前支承压力的影响范围。在18215工作面收作期间,采区系统巷道变形量较小,保证了采区系统巷道的正常使用,取得了较好的卸压效果。

Aiming at the problem of severe deformation and difficulty in maintenance of the roadway in the mining area system roadway of Pan'er Mine due to the influence of multiple mining of the working face stoping, a combined method of numerical simulation, theoretical analysis, and on-site testing is adopted to propose the hydraulic fracturing roof cutting pressure relief and roadway protection technology for the roof strata, and engineering practice is carried out. The results show that advance hydraulic fracturing is conducted on the hard roof strata outside the influence range of mining stress in the working face. The roof strata is subjected to tensile damage under the action of high-pressure water, resulting in hydraulic cracks. The high-pressure water connects the hydraulic cracks with the original cracks and continuously expands under the pressure maintaining effect, forming obvious artificial cracks in the hard strata of the roof, damaging the integrity of the roof strata, blocking the transmission of mining stress in the strata and reducing the influence range of advanced support stress. During the recovery operation period of the 18215 working face, the roadway deformation amount of the mining system is relatively small, ensuring the normal use of the roadway in the mining area system and achieving relatively good pressure relief effect.