doi:10.16186/j.cnki.1673-9787.2019100050

Received:2019/10/21

Revised:2020/03/20

Published:2021/05/15

Numerical simulation of rationalization of the angle betweenhorizontal crossing roadways

REN Jiandong1, LI Xiaobai2, WANG Wen1

1.School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;2.Shanxi Horsinghe Coal Industry Co.， Ltd.， Changzhi  046000 ，Shanxi， China

Abstract:It is of practical significance to study the influence of the value of angle between horizontal crossing roadways on the deformation and failure of surrounding rocks and the development of plastic zones.Based on the intersection of headway and connection roadway on the coal face 221 上 of a coal mine as study background， the numerical simulation software FLAC3 D was used to analyze the evolution of the top and bottom of the roadway under different crossing angles and the distribution characteristics of the plastic zones.The results showed that， with the crossing angle increasing， the top subsidence and the bottom heave gradually decreased in the range of 10°〜 80°.and increased in the range of >80°〜90°.When the crossing angle was 80° ， the top subsidence and bottom heave were relatively small.The volumes of the plastic zone produced by the two crossing roadways were approximately equal under the crossing angle of 10°〜80°.Among the types of damages to the surrounding rock in the intersection roadway， the shear failure occurring， the shear failure occurred， the tensile failure occurring， and the tensile failure occurred accounted for 72.60% ，20.70% ，6.65%  and 0.05% ， respectively.Combining numerical analysis and engineering practice， it was considered that the value of the crossing roadway angle was reasonable in 80°〜90°.

Key words:horizontal crossing roadway;crossing angle;surrounding rock stability;plastic zone;FLAC3D

 水平交叉巷道间夹角合理化取值数值模拟_任建东.pdf