doi:10.16186/j.cnki.1673-9787.2020020036

Received:2020/02/17

Revised:2020/05/27

Published:2021/11/15

Study on influencing factors of surrounding rock deformation and asymmetric support technology for roadway driving along goaf with narrow coal pillars

CHEN Xiaoxiang1,2, ZHANG Tian1, WANG Yiliang1

1.School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency U tilization， Jiaozuo  454000 ， Henan， China

Abstract:Abstract： In order to determine the influencing factors and control technology for the deformation of the sur-rounding rock in the roadway driving along goaf with narrow coal pillar ， taking the railway of Longbo Coal In-dustry 8507 working face as the engineering background ， the orthogonal test was designed based on the orthogonal table and simulation software FLAC3D to study the factors affecting the deformation of surrounding rock in roadways along the gob and the deformation characteristics of surrounding rock in different conditions ， the dam-age range of the shaping zone of the coal pillar with width of 4 ~ 10 m ， the surrounding rock stress and roof dis-placement distribution. The research results showed that among the five factors ； coal pillar width， coal cohesion ， friction angle of coal immediate roof thickness and roof strength ， coal pillar width had the most significant effect on the surrounding rock deformation of the roadway ； The changes in the damage range and shape of the plastic area of the roadway were mainly reflected in the narrow coal pillars and the roof ， and the size of the plastic areas on the floor and the solid coal side was small. The rock deformation was asymmetric deformation， and the deformation of the roof and side of the roadway on the coal pillar side was significantly larger than that on the mining side of the coal face. An asymmetrical support scheme was proposed for the roof and two pairs of anchor mesh cables + steel belts， narrow coal pillars to help channel steel beams + grouting reinforcement. The results of on-site industrial tests showed that the coal pillar width and support scheme were reasonable， and the roadway deformation met the needs of the coal face. The research results could provide reference for the surrounding rock control of small coal pillars along the goaf under similar geological conditions.

Key words:roadway driving along goaf;narrow coal pillar;surrounding rock deformation;orthogonal test;numerical simulation;asymmetric support

 窄煤柱沿空掘巷巷道围岩变形影响因素及非对称支护技术研究_陈晓祥.pdf