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

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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.

Blocky rock massRockbolt ground supportUniaxial compression testFailure mechanismUniaxial compressive strength model

Chun Zhu、Xiansen Xing、Manchao He、Zhicheng Tang、Feng Xiong、Zuyang Ye、Chaoshui Xu

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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

State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining and Technology,Beijing 10083,China

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

School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China

School of Chemical Engineering,Faculty of Sciences,Engineering and Technology,The University of Adelaide,Adeliade 5005,Australia

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National Key Research and Development Projects of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinaopening fund of State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chineopening fund of Key Laboratory of Water Management and Water Security for Yellow River Basin,Ministry of Water Resources

No.2021YFB2600402Nos.5220914852374119No.SKLGME023023No.2023-SYSJJ-02

2024

10.1016/j.ijmst.2024.06.008

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)

CSTPCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2024.34(6)
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