深部一巷多用巷道围岩重构及大变形控制关键技术

Key techniques for surrounding rock reconstruction and large deformation control under deep and multi-purpose roadway conditions

一巷多用是实现保护层、被保护层瓦斯联合治理和降低治理成本,提高治理质量和速度的有效途径,但巷道不可避免地要经受多个工作面重复采动影响,围岩变形极为剧烈。为解决深部高应力与多重采动应力协同作用下巷道围岩的大变形难题,以淮南矿区潘三矿17181(1)瓦斯综合治理巷为工程背景,采用地应力测试分析,围岩力学性质测试,钻孔窥视等地质力学评估方法,研究并应用了一巷多用条件下巷道围岩重构及大变形控制系列关键技术。采用孔壁注浆锚索同步实现了采动影响后顶板围岩注浆重构及锚索内锚破坏后的再次锚固;采用叶片式搅拌锚索使锚固剂各组分充分混合,内锚强度及可靠性显著提升;采用高强度、高刚度箱型梁使锚索组合构件承载能力较14号槽钢梁提高8倍以上。工程应用结果表明,试验巷道经受住了邻近两工作面的双重采动影响,并为邻近第3个工作面的瓦斯抽采创造了有利条件,实现了巷道的多功能化,整体节约成本1300余万元,技术经济效益显著。

Multi-purpose roadway is an effective way to realize the joint control of gas in protective layer and protected layer,and to control the gas in a stable,fast and efficient way.However,the roadway is inevitably subjected to repeated mining in multiple working faces,and the surrounding rock deformation is extremely severe.In order to solve the problem of large deformation control of roadway surrounding rock under the synergy of high stress and multiple mining stress,taking No.17181( 1) gas integrated management roadway as the engineering background in Pansan Mine of Huainan Mining Area.On the basis of geomechanical evaluation methods,such as geostress test analysis,mechanical properties of surrounding rocks,and drilling and peeping,a series of key techniques for rock reconstruction and large deformation control of roadway under multifunctional conditions were studied and applied.The hole wall grouting anchor cable was used to synchronously realize the grouting reconstruction of the surrounding rock of the roof after mining and the re-anchoring after the inner anchor of the anchor cable is destroyed.Based on the research and development of leaf stirring anchorage cable,the anchorage agents were fully mixed,and the strength and reliability of internal anchorage were significantly improved.The use of high-strength and high-rigidity box beams makes the load-bearing capacity of the anchor cable assembly more than 8 times higher than that of No.14 groove steel.The engineering application results show that the test roadway can withstand the influence of double mining of two adjacent working faces,and creates favorable conditions for gas extraction of the third working face nearby,the multifunctional roadway can be realized,and significant technical and economic benefits can be achieved.