Study On Excavation And Supporting In Inclined Shaft Of Rich-water Conglomerate Layer

How to drivage and construct a roadway in rich-water geological environment and deformation control of surrounding rock of roadway is the important research field during the mine construction area.Especially when the surrounding rock is affected by water,roadway excavation,mining and supporting,it’s easier to trigger reaction between rock and water in some degree.Based on the phenomenon,the paper relies on the project of main inclined shaft in Hong Qing Liang colliery,having a research on the supporting design in rich-water conglomerate layer,roadway construction scheme and water treatment scheme.The research majorly includes several aspects:(1)By taking samples of main inclined shaft conglomerate,carrying out rock density,water content,uniaxial compressive strength,shearing strength and modulus parameter experiment,analyzing conglomerate physical and mechanical property,the characteristic of main inclined shaft conglomerate is high water content,small strength index,low stress level,rock stiffness,fracture development,rock fragmentized,poor cementation;(2)Having mineral composition determination of main inclined shaft conglomerate and estimation of lithology,revealing the flow of groundwater,seepage pressure,fracture of conglomerate,poor cementation are the main reasons of rock mass failures;(3)Having the optimal design of the supporting structure for rich-water conglomerate layer,proposing three kinds of supporting schemes,confirming the final support pattern is that metal net + sprayed concrete + U-shape metal stents in forward direction tunnelling and anchor bolt+metal net+ anchor rope+ sprayed concrete in reverse direction tunnneling;(4)Studying precise pass-through technology in reverse direction tunnelling,making numerical simulation about execution of main inclined shaft in rich-water conglomerate layer,getting the transformation law of plastic zone of rock,stress state and displacement changes;(5)Taking dynamic observations of rich-water conglomerate layer,getting feedback on the inclined shaft supporting and change of the surrounding rock.