›› 2018, Vol. 39 ›› Issue (4): 1263-1270.doi: 10.16285/j.rsm.2017.1415

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Optimisation of bolt rib spacing and anchoring force under different conditions of surrounding rock

ZHAO Xiang-zhuo1, ZHANG Hong-wei1, 2, CAO Chen 2, 3, ZHANG Ming1, ZHANG Huai-dong1, HAN Jun1, 2   

  1. 1. College of Mining, Liaoning Technical University, Fuxin, Liaoning 123000, China; 2. Research Center of Coal Resources Safety Mining and Clean Utilization, Liaoning Technical University, Fuxin, Liaoning 123000, China; 3. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
  • Received:2017-07-06 Online:2018-04-11 Published:2018-06-06
  • Supported by:

    This work was supported by the Research Center of Coal Resources Safety Mining and Clean Utilization (LNTU15KF02).

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Abstract: This study investigated the relationship between bolt rib spacing and anchorage performance under different conditions of surrounding rock. Based on the thick-walled cylinder theory, pull-out tests were carried out on sinistral rebar bolt specimens with the spacing of 12, 24, 36, and 48 mm, which were anchored in the steel sleeves with wall thicknesses of 4.5 and 6.0 mm, respectively. Results of the drawing force, the displacement of drawing force more than 100 kN, the circumferential strain of the sleeves and energy dissipation were obtained. Experimental results show that the displacement of drawing force more than 100 kN, the circumferential strain and the energy dissipation value of the sleeve increase with increasing the rib spacing in different sleeves (different surrounding rock conditions), respectively. The pulling force of anchor rod is found to be the highest when the rib spacing is 24 mm. While with the same rib spacing, the stronger the surrounding rock is, the larger the pulling force is. The circumferential strain of the sleeve with a 4.5 mm thick wall is larger than that of 6.0 mm, which indicates that the effect of surrounding rock is significant on the deformation ability of bolts. Moreover, the anchorage performance can be improved by increasing the rib spacing under different surrounding rock conditions.

Key words: thick-walled cylinder theory, pull-out test, sinistral rebar bolt, rib spacing, anchorage performance

CLC Number: 

  • TP 028.8

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