Failure behavior and strength model of blocky rock mass with and without rockbolts

Chun Zhu ¹Xiansen Xing ²Manchao He ³Zhicheng Tang ⁴Feng Xiong ⁵Zuyang Ye ⁶Chaoshui Xu⁷

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作者信息

1. School of Earth Sciences and Engineering,Hohai University,Nanjing 210024,China
2. School of Earth Sciences and Engineering,Hohai University,Nanjing 210024,China;Key Laboratory of Water Management and Water Security for Yellow River Basin,Ministry of Water Resources(under construction),Zhengzhou 450003,China
3. School of Earth Sciences and Engineering,Hohai University,Nanjing 210024,China;State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining and Technology,Beijing 10083,China
4. Faculty of Engineering,China University of Geosciences,Wuhan 430074,China
5. Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China
6. School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China
7. School of Chemical Engineering,Faculty of Sciences,Engineering and Technology,The University of Adelaide,Adeliade 5005,Australia
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Abstract

To better understand the failure behaviours and strength of bolt-reinforced blocky rocks,large scale extensive laboratory experiments are carried out on blocky rock-like specimens with and without rock-bolt reinforcement.The results show that both shear failure and tensile failure along joint surfaces are observed but the shear failure is a main controlling factor for the peak strength of the rock mass with and without rockbolts.The rockbolts are necked and shear deformation simultaneously happens in bolt reinforced rock specimens.As the joint dip angle increases,the joint shear failure becomes more dominant.The number of rockbolts has a significant impact on the peak strain and uniaxial compressive strength(UCS),but little influence on the deformation modulus of the rock mass.Using the Winkler beam model to represent the rockbolt behaviours,an analytical model for the prediction of the strength of bolt-reinforced blocky rocks is proposed.Good agreement between the UCS values predicted by proposed model and obtained from experiments suggest an encouraging performance of the proposed model.In addition,the performance of the proposed model is further assessed using published results in the liter-ature,indicating the proposed model can be used effectively in the prediction of UCS of bolt-reinforced blocky rocks.

Key words

Blocky rock mass/Rockbolt ground support/Uniaxial compression test/Failure mechanism/Uniaxial compressive strength model

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基金项目

National Key Research and Development Projects of China(No.2021YFB2600402)

National Natural Science Foundation of China(Nos.52209148)

National Natural Science Foundation of China(52374119)

opening fund of State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chine(No.SKLGME023023)

opening fund of Key Laboratory of Water Management and Water Security for Yellow River Basin,Ministry of Water Resources(No.2023-SYSJJ-02)

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3

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