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Mechanical responses of anchoring structure under triaxial cyclic loading

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Dynamic load on anchoring structures(AS)within deep roadways can result in cumulative damage and failure.This study develops an experimental device designed to test AS under triaxial loads.The device enables the investigation of the mechanical response,failure mode,instability assessment criteria,and anchorage effect of AS subjected to combined cyclic dynamic-static triaxial stress paths.The results show that the peak bearing strength is positively correlated with the anchoring matrix strength,anchorage length,and edgewise compressive strength.The bearing capacity decreases significantly when the anchorage direction is severely inclined.The free face failure modes are typically transverse cracking,concave fracturing,V-shaped slipping and detachment,and spallation detachment.Besides,when the anchoring matrix strength and the anchorage length decrease while the edgewise compressive strength,loading rate,and anchorage inclination angle increase,the failure intensity rises.Instability is deter-mined by a negative tangent modulus of the displacement-strength curve or the continued deformation increase against the general downward trend.Under cyclic loads,the driving force that breaks the rock mass along the normal vector and the rigidity of the AS are the two factors that determine roadway stability.Finally,a control measure for surrounding rock stability is proposed to reduce the internal driving force via a pressure relief method and improve the rigidity of the AS by full-length anchorage and grouting modification.

Triaxial stressDynamic-static combination loadCyclic loadingAnchoring structure(AS)Cumulative damage

Peng Wang、Nong Zhang、Qun Wei、Xingliang Xu、Guangzhen Cui、Aoran Li、Sen Yang、Jiaguang Kan

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State Key Laboratory of Coal Resources and Safe Mining,School of Mines,China University of Mining and Technology,Xuzhou,221116,China

School of Civil Engineering,Xuzhou University of Technology,Xuzhou,221116,China

School of Mechanical Engineering,Jiangsu University of Technology,Changzhou,213001,China

National Natural science Foundation of ChinaNational Natural science Foundation of ChinaPostgraduate Research and Practice Innovation Program of Jiangsu Province

5207426352034007KYCX21_2332

2024

10.1016/j.jrmge.2023.04.020

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(2)
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