WEI S J, ZHANG S, ZHAI L W, et al.Stress analysis of thin composite roof bolt based on continuous beam[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):11-18.

doi:10.16186/j.cnki.1673-9787.2021020065

Received:2021/02/27

Revised:2021/05/24

Published:2023/03/25

Stress analysis of thin composite roof bolt based on continuous beam

WEI Sijiang1,2, ZHANG Sheng1, ZHAI Liwei1, WANG Meng1,2, LIU Zhenshu3, CHEN Kehang3, CHEN Xu3

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 Utilization，Henan Polytechnic University，Jiaozuo  454000，Henan，China；3.Hebi Coal Industry Group Co.，Ltd.，Hebi  458000，Henan，China

Abstract:In order to study the force of the bolts of the thin composite roof of the coal mine，the theoretical analysis，numerical simulation and on-site observation methods were adopted use the three-hinged arch structure and the continuous beam mechanical analysis model of the roadway roof to anchor the rock were used to the bolt force and the stability of the top coal mining roadway.The conclusions were as follows：The normal stress，shear stress and deflection in the bolt all occur in the soft rock section at the lowest part of the roof，and the deep deflection was small；The stress caused by bending deformation was greater than the stress caused by direct axial tension，and the bending deformation was greater than the axial tensile deformation.In addition to the overall sinking of the roadway roof anchor solid，its internal uneven fracture deformation would impose a relatively large bending load on the bolt.Fracture angle and settlement of the three-hinged arch structure could be reduced by selecting the bolt with larger stiffness，strong surface protection component and strong anchor cable.Aiming at the supporting top coal mining roadway of 3204 isolated island working face in 9th coal mine of Hemei coal company，high-strength bolt and densified anchor cable were used for active coupling support.Combined with double-layer plastic woven mesh to prevent leakage and caving，single hydraulic prop was used to strengthen support in local sections，which could effectively control the subsidence of thin composite anchor roof，and reduce the bending deformation and fracture of bolt（cable）.The surrounding rock was effectively controlled.

Key words:thin composite roof;three-hinged arch;bolt support;continuous beam

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