doi:10.16186/j.cnki.1673-9787.2019090074

Received:2019/09/19

Revised:2020/03/20

Published:2021/05/15

Study of the influence of equilibrium states on results of rock bolt pull-out numerical simulation

DU Xueling

Institute of Mining Engineering， Guizhou Institute of Technology， Guvyang 550003 ， Guizhou， China

Abstract:In order to analyze the influence of different equilibrium state on results of bolt pull-out numerical simulation， the numerical simulation method was used to establish the anchor model in the FLAC3D by using the Cable structural element， and the influence of different equilibrium state and different modeling method on the anchoring effect was studied by pull-out tests. The results showed that from the trend of axial stress evolution ，whether to calculate the secondary balance between the anchor and the surrounding rock after the installation of the anchor did not affect the evolution of the axial force in the bolt pull-out test， but it would affect the magnitude of the force and the time the anchor system failed. From the relative cycle steps， the anchoring balance in the borehole had little effect on the simulation results， but the calculation time would significantly increase after considering the anchoring balance in the borehole. If the stress release of the surrounding rock and the delay working of the bolt were taken into account， the anchoring equilibrium state in the borehole should not be neglected. If only the final influence of the bolt parameters change on the supporting effect was evaluated， there was no need to consider the anchoring balance in the borehole. The effect of the zones' properties in contact with the Cable was more significant than the impact of the grout parameters on the simulation results.

Key words:FLAC3D;rock bolting;numerical simulation;roadway support;equilibrium state;pull-out test

 锚杆拉拔模拟中平衡状态对模拟结果的影响研究_杜学领.pdf