Support Technology of Mine Gateway in Seam with Soft Roof, Soft Coal and Soft Floor
QU Chao
MA Zhen-lin
Abstract：A designed length of No.2920 transportation gateway in Yuqia Company’s Mine of Qinghai Energy Development Group was 2200m.The mine gateway with a vertical sidewall and semi-circle arch cross section was placed in No.7 seam and was driven along the roof of the seam.The mine gate-way was in a seam with a soft roof ,soft coal and soft floor and was in a depth of 300m.In order to re-duce a support cost ,the support mode of the mine gateway was mainly based on bolt-steel mesh ,an-chor and bolt steel band.At some special section of the gateway ,a combined support with a U type steel square support ,shotcreting ,grouting reinforcement and other different composited modes was a-dopted and an expected effect was obtained.The paper stressed the introduction on three support plans and support effects under a normal condition ,high strata pressures and large deformation of the mine gateway in the seam with the soft roof ,soft coal and soft floor.
Keywords：seam with soft roofsoft coal and soft floormine gatewaygrouting reinforcementcom-bined supportmining-induced pressure
Publication Date：2014-04-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 21-24 )