DOI: 10.11799/ce201710019
Support technology and width effect of large section coal roadway
ZHANG Feng-yan
Abstract：Aiming at the surrounding rock control difficulty with the increasing width of coal roadway. The influence of roadway width on surrounding rock is analyzed with FLAC3D , based on the background of No. 10104 rail roadway in Ciyaogou Coal Mine. The results show that, plastic zone areas in the roof, floor and two ribs were all distributes as semi-ellipse, and the increasing rate of plastic zone areas and depth with the width increasing can be ranked as: roof>two ribs>floor; the displacement in roof, floor and two ribs decreases negative exponentially as the depth increases; under the same surrounding rock depth, the surface displacement and displacement increment can be ranked as: roof>two ribs>floor; along with the increasing roadway width, the abutment pressure in shallow part of the rib decreases and the peak abutment pressure move to the deep. A combined support technology is proposed applying high strength and high pre-stress bolt support and truss-cable support, based on the support characteristics. According to engineering practice, the two-rib convergence is 97mm, the roof-to-floor convergence is 127mm and the roof separation is 3mm.
Keywords：large sectionthick top-coalcoal roadwaycombined supportsurrounding rock controlabutment pressure
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 77-80 )