深部巷道锚网喷注协调支护时效性研究

针对深部巷道顶板变形量大,锚杆锚索易破断、失效,不断维修耗工耗时等问题,应用流变元件建立了顶板支护结构的本构模型,结合邢东矿-980水平巷道交叉点顶板变形监测数据,分析研究了锚网喷-锚索-锚注支护体系在不同支护时期的变形规律与特点,得出了联合支护方案中各支护单元的合理支护时机。结果表明：合理选择补强与注浆施工时间,可有效提高围岩稳定性,支护单元的性能得到了充分发挥,并在一定程度上抑制了围岩收敛速度,试验条件下一次支护后10,17~25 d分别为补强支护与注浆加固的合理时间,支护后100 d内顶板下沉量平均减小了23%,注浆15 d进入缓慢收敛阶段,平均变形速率0.51 mm/d。

Research on timeliness of coordination support of bolting-mesh-shotcreting-grouting in deep roadway

In view of the problems of large deformation of deep roadway roof,ease rupture and failure of bolt and anchor cable,and constant sidewall reinforcement,this study established a constitutive model of roof support structure by using rheological element.Combining the roof deformation monitoring data of -980 horizontal roadway crossing point at Xingdong mine,the study analyzed the deformation law and characteristics of anchor net spray-anchor-grouting supporting system,and obtained the reasonable support time of supporting system.The results show that the reasonable choice of reinforcing and grouting construction time could improve the stability of surrounding rock effectively,the performance of the support unit is fully played,and the convergence rate of surrounding rock is restrained,10 d and 17-25 d are the reasonable time of the reinforcing support and grouting reinforcement in the test conditions after first support,the average roof subsidence is reduced by 23% in 100 d after support,in the slow convergence stage after grouting 15 d,average deformation rate is 0.51 mm/d.