Research on Stability of Gateway Retained Along Goaf in Thin Seam with Hard Roof and Hard Coal
ZHANG Xuefeng
Abstract：In order to solve high difficult problem of the gateway retained along the goaf under the condition of the thin seam with hard roof and hard coal,taking Jiangjiawan Mine as a study object,a coordinative yield support was provided to the gateway internally and a compressive and yield combined support was provided to the gateway sidewalls.A yield curve of a constant yield bolt (anchor)and a mixing ratio between the polymer yield swelling material and the compressive material was provided.With the analysis,a support with a ?18 mm×2 400 mm yield bolt and a ?17.8 mm×8 000 mm yield anchor was determined for the gateway internally and a support plan with 2 m wide polymer yield swelling material and the compressive material determined for the gateway sidewalls.The application results showed that the max convergence between the roof and floor and the two sidewalls of the gateway was 255 mm and 249 mm individually and a max convergence ratio of the gateway cross section was 15%,which could ensure the stability of the gateway retained along the goaf in the thin seam with hard roof and hard coal.
Keywords：thin seam with hard roof and hard coalgateway retained along goafbackfill of gateway sidewallstability of surrounding rock
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 22-25 )