DOI: 10.11799/ce202504007
Zoned support technology for roadways under district coal pillar in contiguous coal seams
LIU Yikun
LIU Wei
FENG Jianye
ZHENG Xiaodong
NIU Kun
YANG Changde
Abstract：In order to study the surrounding rock control technology of the roadway under the district coal pillar in contiguous coal seams mining,theoretical calculation and numerical simulation were carried out.The width and stress distribution of plastic zone in the district coal pillar was obtained.The stress distribution law was studied for the lower coal seam under the district coal pillar with different interlayer conditions,the reasonable locations of the lower coal seam roadways were determined,the deformation characteristics of the the roadway surrounding rock were analyzed,and the principle of asymmetrical zoned support was proposed.The surrounding rock deformation under different support conditions was calculated.The results show that:there is a 5.38 m elastic zone in the middle of the upper-seam district coal pillar,showing stress concentration;the stress environment is good when the lower mining roadway is arranged with 6 m of inward stagger,and the numerical simulation shows that the deformation of the roof,floor and left wall are all within 200 mm,and it is necessary to strengthen the support at the coal pillar sides.Combining with the actual production conditions,an asymmetric zoned support scheme for the roadway was determined.The findings can offer reference for the roadway layout and support design under similar conditions.
Keywords：contiguous coal seamsdistrict coal pillarreasonable location of roadwayasymmetric support
Publication Date：2025-04-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 41-47 )