Shear Test of Bolted Joint Rock Masses Considering Joint Roughness

被引：0
|
作者：
Wang L.-Q. [1 ]
Zhu L.-F. [1 ]
Zheng L.-B. [1 ]
Fan B.-Q. [1 ]
Sun Z.-H. [1 ]
Chen H.-J. [2 ]
机构：
[1] Faculty of Engineering, China University of Geosciences, Wuhan
[2] Huaneng Lancang River Hydropower Inc., Kunming
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2021年 / 34卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Bolt resistance; Bolted rough joint; Road engineering; Shear characteristics; Shear test;
D O I：
10.19721/j.cnki.1001-7372.2021.06.005
中图分类号：
学科分类号：
摘要：
To study the influence of roughness on the shear characteristics of bolted joint rock masses and the shear resistance of bolts, a three-dimensional reconstruction method for rock joint surfaces based on Synfrac software and three-dimensional carving technology was proposed. A shear test of a bolted joint rock mass under different joint roughness (JRC) values and different normal stresses was conducted. The influence of the joint dilatancy effect on the axial force, deformation, and failure mode of the bolt was studied, and a resistance formula was proposed considering joint dilatancy based on static analysis. The experimental results show that, with the increase in JRC, the dilatancy effect of the joint increases the axial deformation of the bolt, so that the bolt exerts a greater axial force, and increases the contribution of the shear strength (bolt resistance) that bolts to the joint surface. When the axial force of the bolt increases, the bolt changes from a tension-shear failure mode to a tension-bending failure mode. Based on the experimental results, the dilatancy angle in the Barton formula was introduced based on the static analysis, and a bolt resistance formula considering JRC and normal stress was proposed. The predicted results of the formula were in good agreement with the experimental results, and the average relative error was 7.6%. © 2021, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：38 / 47
页数：9
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