Research on Surrounding Rock Deformation Control Technology in Roadway Excavation Along Goaf of Isolated Island Working Face
Aiming at the problem of severe mine pressure behavior,severe surrounding rock deformation,and difficult maintenance of the roadway along goaf in the 4310 isolated island working face of Pengzhuang Coal Mine,which seriously affects the construction of efficient and safe working faces,FLAC3D numerical simulation software is used,combined with theoretical analysis and on-site experiments,to determine the reasonable width of small coal pillars and optimize the support parameters of the roadway excavation along goaf.The research results indicate that by adjusting the width of the small coal pillar to 15 m,the stress concentration of the surrounding rock can be effectively reduced,the deformation amount of the roadway surrounding rock can be reduced,and the overall stability of the roadway can be effectively guaranteed;After optimizing the support scheme,the use of Φ20 mm×2500 mm anchor rods and Φ21.8 mm×9600 mm anchor cables can significantly improve the stability of the roadway surrounding rock.Industrial test is carried out using a 15 m small coal pillar and above supporting scheme for roadway excavation along goaf in the 4310 transportation crossheading.The monitoring results of roadway surface displacement and anchor rod stress show that the deformation amount of the roadway surrounding rock is controlled within a relatively small range,and the support system can fully play its role.
small coal pillarroadway excavation along goafsurrounding rock deformation control
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