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Hole enlarging anchorage technology of surrounding rock of roadway in weakly consolidated formation

  • Weiguang ZhangEmail author
GMGDA 2019
  • 9 Downloads
Part of the following topical collections:
  1. Geological Modeling and Geospatial Data Analysis

Abstract

Aiming at the problem of surrounding rock deformation control of the roadway in weakly consolidated formation and combined with the calculation method of anchoring force of anchor bolt, this paper analyzes the feasibility of hole enlarging and anchoring and proposes a calculation method for the anchoring force of hole enlarging and anchoring; this paper establishes a simplified mechanics model of cylinder table enlarging, standing circular table enlarging and circular table enlarging with the method of theoretical mechanics and material mechanics and finds after analysis that the anchoring effect is best when the angle between the busbar and the axis of the circular table is θ < 45°. It draws a two-variable function relation curve for the surrounding rock stress σb and the hole enlarging parameters at the supporting region of the enlarged part of the standing circular table and obtains the optimal anchor length L is 130 mm, the optimal hole enlarging angle θ is 15°, and the optimal hole diameter D is 100 mm. It verifies the theoretical analysis results with numerical calculation, and the results show that the theoretical derivation is consistent with the simulation results. The research results make up the inadequacies of the accurate calculation method for the optimal hole enlarging parameters of the surrounding rock hole of roadway in the weakly consolidated formation, and provide a theoretical basis for the popularization and application of the anchoring technology in the roadway support of weakly consolidated formation.

Keywords

Weakly consolidated formation Enlarging anchorage Standing circular table Bearing characteristics 

Notes

Funding information

This work is supported by the Research Fund of The State Key Laboratory of Coal Resources and safe Mining, CUMT (SKLCRSM18KF020).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Coal Resources and Mine SafetyChina University of Mining & TechnologyXuzhouChina
  2. 2.Xingjiang Institute of EngineeringMining Engineering and Geology CollegeWulumuqiChina

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