Anchoring mechanical characteristics of Ductile-Expansion bolt

Yu Chen ¹Wang Liu ²Linchong Huang ¹Hang Lin ³Yixian Wang ⁴Yanlin Zhao ⁵Cungang Lin¹

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作者信息

1. State Key Laboratory for Tunnel Engineering,Guangzhou 510275,China;Guangdong Research Center for Underground Space Exploitation Technology,Guangdong Key Laboratory of Marine Civil Engineering,School of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China
2. State Key Laboratory for Tunnel Engineering,Guangzhou 510275,China;Guangdong Research Center for Underground Space Exploitation Technology,Guangdong Key Laboratory of Marine Civil Engineering,School of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,China
3. School of Resources and Safety Engineering,Central South University,Changsha 410083,China
4. School of Civil Engineering,Hefei University of Technology,Hefei 230009,China
5. School of Energy and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China
折叠

Abstract

The application of ductile rock bolts has been a crucial method for solving the problems of large defor-mations,energy absorption and stability control issues in deep rock masses.To study the anchoring mechanism of the key expansive structure,this paper proposes a novel type of bolt-the Ductile-Expansion bolt,and conducts research on anchoring mechanics,energy absorption characteristics,and failure modes of the bolt.In addition,this paper defines the concept of load-volume ratio of metal rock bolts and proves the Ductile-Expansion bolt is capable of better improving the unit volume bearing capacity of the bolt material.Furthermore,laboratory and field tests verify the Ductile-Expansion bolt had better anchoring effect than the traditional rebar bolt,with the expansion structure favorably enhancing the ductility and energy absorption performance of the bolt.Finally,this paper microscopically analyzes the crack propagation and distribution morphology of the bolts by establishing a 3D coupled numerical model based on FDM-DEM.Numerical results illustrate the interface at the variable diameter of the Ductile-Expansion bolt serves as the transition zone between high and low stress levels.The expan-sion structure can impose radial compression on the medium around the bolt,which can improve the bolt anchorage performance.

Key words

Ductile-Expansion bolt/Pull-out test/Peak load/Anchoring mechanical characteristics

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基金项目

National Natural Science Foundation of China(52174101)

National Natural Science Foundation of China(52474169)

National Natural Science Foundation of China(42477202)

Guangdong Basic and Applied Basic Research Foundation(2023A1515011634)

Guangdong Basic and Applied Basic Research Foundation(2023A1515030243)

Department of Science and Technology of Guangdong Province,China(2021ZT09G087)

出版年

2024

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDEI

影响因子：1.222

ISSN：2095-2686

参考文献量24

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