Research on surrounding rock control technology of external-misaligned stagger arrangement of roadway in ultra-thick seam

Abstract

In view of the problem of the reserved width of coal pillar in the full-mechanized caving mining and the surrounding rock control technology of continuous working face in ultra-thick coal seam, the coal mining method of external-misaligned stagger arrangement of the roadway was introduced and layout of roadway was adopted to stereoscopic arrangement of "one high, one low".The coal side of the gob of 1301 working face is divided vertically in the vertical direction into the next goaf side of solid coal zone, the transition zone, and the elastic zone.The stagger distance away from the roadway is 2m obtained by theoretical calculations and incorporated with the numerical simulation of FLAC3D to analyze the effect of combined support on the intersection of adjacent roadways under the zero source rock stress field were studied.Finally, the scheme of supporting parameters for the combined anchorage zone was determined to reduce the deformation of the roadway and control the surrounding rock effectively, which is instructive for the application of mine engineering.

Keywords

• stagger arrangement
• external-misaligned
• stagger away
• combined anchorage area