深井强动压作用巷道强化控制技术研究及应用

煤系地层围岩软弱,在高地压作用下开采深部煤层时,由于埋深大使得巷道的围岩变形严重,巷道的顶板及底鼓量均大于浅埋深巷道,导致深部巷道围岩稳定性控制与支护的难度加大,影响顶帮的稳定从而使得整个巷道失去稳定。通过分析巷道变形破坏机理,根据锚杆索支护理论与注浆加固理论制定了“巷道扩刷+顶帮分区耦合强力支护+底角卸压与加固+底板注浆加固、底板锚索束+喷射钢纤维混凝土+顶板与两帮高压注浆加固”的高强度联合支护方案,确定了支护参数,有效解决了深井强动压大变形巷道的支护问题。通过对现场进行监测,巷道变形量明显减小,巷道变形得到了有效控制。为同类条件下的深井强动压巷道的全断面支护问题提供了新的思路和方法。

Intensified Control Technology for Roadway under Strong Dynamic Pressure in Deep Mine and Its Application

The surrounding rock of coal strata is weak.When mining deep coal seams under high ground pressure,the surrounding rock deforms seriously due to large buried depth.Since the roof and floor heave of the deep roadway is larger than the shallow-buried roadway,it is more difficult to control and support the stability of surrounding rock in the deep roadway,which could affect the roof stability and cause the instability of the entire roadway.On the analysis of the deformation and failure mechanism of the roadway,based on the bolt and cable support theory and grouting reinforcement theory,a high-strength combined support plan was formulated,namely“roadway expansion+roof and two sides coupling support+base angle pressure releasing and reinforcement+floor grouting reinforcement and floor anchor cable bundle+sprayed steel fiber concrete+roof and two sides of high pressure grouting reinforcement”.Then the support parameters were determined,which effectively solved the support problem of the strong dynamic pressure and large deformation roadway in the deep mine.Field monitoring showed that the roadway deformation was reduced and the roadway deformation was under control.The study could provide new ideas and methods for the full-section support of deep wells with strong dynamic pressure under similar conditions.