底板切槽卸压控鼓技术在高应力软岩巷道中的应用

Application of pressure relief and floor heave control technology by floor grooving in high stress soft rock roadway

随着冲击地压防治措施的落实执行,巷道及硐室层位更多考虑布置于煤层底板或顶板中。受深部高应力显现及底板软岩特性等影响,巷道形变特别是底鼓尤为突出,通过在巷道底板施工切槽,将高应力转移到巷道基角和底板深部围岩,为巷道底板围岩变形提供补偿空间,使应力升高区向围岩深部转移,用切槽的形变量代替了巷道底板变形量,塑性区范围逐步扩大,应力变化区域平稳,应力集中现象减弱,从而防止高水平应力场下严重底鼓的发生达到卸压控鼓的目的;同时,采取疏、排、堵等控水措施减少因水理因素造成的巷道底鼓现象。

With the implementation of rock burst prevention measures,the roadways and chambers are more considered to be arranged in the coal seam floor or roof.Due to the high stress concentration and the characteristics of soft rock floor in deep mine,the deformation of roadway,especially floor heave,is particularly prominent.By cutting the groove in the roadway floor,the high stress is transferred to the roadway base-angle and the deep surrounding rock of the floor,which provides compensation space for the deformation of the roadway floor surrounding rock,and makes the stress rising area transfer to the deep surrounding rock.The deformation of the roadway floor is replaced by the shape variable of the groove,and the plastic area is gradually expanded,the stress change area is stable,and the stress concentration phenomenon is weakened,so as to prevent the occurrence of serious floor heave under high stress field and achieve the purpose of pressure relief and floor heave control.At the same time,water control measures such as dredging,drainage and blocking should be taken to reduce the floor heave caused by water factors.