松软破碎煤巷深浅孔联合注浆加固技术

Combined grouting and reinforcement technology for deep and shallow holes in soft and broken coal roadway

针对长平煤矿四盘区43222巷在工作面推进过程中,巷道两帮煤体松动破坏导致煤体受力压缩,引起顶底板及两帮变形量增加,同时支护体系难以维护巷道稳定的问题,通过对巷道围岩注浆加固机理的分析,以及对43222巷受工作面回采扰动进行模拟研究,最后确定了注浆参数并给出了注浆方案。现场监测结果表明:注浆完毕后浆液充分进入节理裂隙之间,填实破碎区,且巷道变形得到控制,顶板下沉量稳定在80 mm,底鼓量稳定在63 mm,两帮移近量稳定在110 mm;围岩整体的稳定性得到提高,有效解决了松软破碎煤巷留设困难的问题,满足了下一工作面继续使用的需求。

Aiming at the problem that the coal bodies of the two sides of the roadway were loosened and destroyed to cause the coal body to be compressed and the deformation of the roof and the two sides during the advancing process of roadway 43222 in the fourth panel area of Changping Coal Mine.Through the analysis of the grouting reinforcement mechanism of the surrounding rock of the roadway,as well as the simulation study of the disturbance of the working face of the 43222 roadway,the grouting parameters are finally determined and the grouting scheme is given.The on-site monitoring results show that the grout fully enters the joints and fissures after the grouting is completed,filling the broken areas,and the roadway deformation is controlled,the roof sinking amount is stable at 80 mm,the floor heave amount is stable at 63 mm,and the two-side approaching amount is stable at110 mm.The overall stability of the surrounding rock has been improved,which effectively solves the difficulty problem of leaving soft and broken coal roadways,and meets the demand for continued use of the next working face.