Rules And Supporting Technology Of Surrounding Rock Loose Circle Distribution Of Dafosi Coal Mine Roadway

Development of distribution law and supporting technology research in mining roadwayloose circle has important engineering application value.This article picks area108and110working surfaces in Buddhist temple4ore as the project backing, By the experimentalresearch, theoretical analysis and field practice combined the methods of work. The mainconclusion include:(1) Acts according to the sample which was adopted from the Buddhist temple ore,carries on experimental studies and so on chemical analysis, physical mechanics obtains40110working surfaces Gao Lingshi and so on to have the expansive rock ingredient contentalong the trough ledger wall in excessively to be high, creates the Buddhist temple oreworking surface with the aqueous phase interaction along the trough after excavating, meetsthe water easily to inflate, the pelization, the rock mass is stave, causes the oversized tunneldistortion.(2) The foundation we obtain from the theoretical analysis and the drill hole: Theneighboring tunnel40108working surfaces return pick are big impact to40110workingsurface transportation along the trough influence, its two groups appear similarly collapsiblephenomenon. The cutting after40110working surfaces to form, as a result of the anchor rod,the anchor cable permanent supports and protections and two row of monomer hydraulicpressure prop temporary supports and protections, determines the loose circle scope control in2.0m, The cutting of the supports and protections effect to be good, can actively controladjacent formation distortion. But in returns process, because the dynamic pressure influence,causes to expand along the trough adjacent formation loose circle scope, the anchor rodsupports and protections has not been able to satisfy the request, must be suitable to thetrough adjacent formation to carry on the enhancement supports and protections. (3) Studying the working surface to destroy the mechanism along the trough and thescene loose circle test result, which is suitable for the trough existing supports and protectionsplan. Using the FLAC simulation to carry on the quality synthetic evaluation and to carry onthe optimization, finally indicated, could not satisfy along the trough existing supports andprotections plan returns safely picks the request, thus the crown anchor cable by the originalsupports and protections the arrangement form, was under the control along the trough roofdistortion; Because the anchor cable encryption arranged reduced the cross function, distortedalong the trough roof evenly; Helps to make up the strong anchor rod to arrange the positionto be reasonable, through reduces the cross function, which helps a biggest displacement tothe base migration, the active control has helped a distortion.(4) I have researched the mechanism of the floor heave of roadway, Putting the “lockedthe foot steel pipe and note thick liquid and tree root pile and release of pressure trough”along the trough, Engineering practice shows that, the roadway floor heave treatment schemeis reasonable.