Deformation and Stability Lost Mechanism and Support Technology of Inclined Layer Roof in Seam Gateway

According to the serious deformation and difficult support of the mining gateway roof in No.Tw01 seam of Hebi Mining Area, from the asymmetric role of t he inclined rock strata, horizontal structure stress, soft and weak stability lost coal wall of the gateway, plasticity flow induction of the floor heave and others, the paper analyzed and revealed the stability lost mechanics mechanism of the roof.The high pre-tensile strength, high rigid surface protective structure was applied to control the separation of the surrounding rock in shallow depth and the self bearing capacity of the surrounding rock should be utilized.The support countermeasures applied would be including the anchor to reduce the powerful suspended force of the span, the reinforced support and the integrated stability promotion of the side wall and corner Z0 ne, and others. The paper provided the parameters of the pre-tensile bolt/steel mesh/anchor combined support technology.The results showed that with the application 0 f the new support plan, during the gateway driving period, the max convergence value of the gateway roof was 44 mm and was reduced by 75% The max convergence V alue of the two side walls was 77 mm and was reduced by 60% . During the mining period of the coal mining face, the final convergence value of the gateway roof was 1 38 mm and convergence value of the two side walls was 179 mm.The support condition of the gateway was obviously improved.