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Qian Yin, Xinxin Nie, Zhigang Tao, Manchao He, Wenhua Zha, Gang Wang, Zhiqiang Yin, Jiangyu Wu, Linfeng Wang, and Yajun Ren, Dynamic mechanical responses and debonding failure mechanisms of a bolt–resin–rock anchoring system subjected to cyclic shear loading, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-025-3161-3
Qian Yin, Xinxin Nie, Zhigang Tao, Manchao He, Wenhua Zha, Gang Wang, Zhiqiang Yin, Jiangyu Wu, Linfeng Wang, and Yajun Ren, Dynamic mechanical responses and debonding failure mechanisms of a bolt–resin–rock anchoring system subjected to cyclic shear loading, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-025-3161-3
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循环剪切作用下锚杆–树脂–岩石锚固系统的动态力学响应与界面失效机制

摘要: 本研究针对锚杆–树脂–岩石锚固系统在循环剪切荷载作用下的动态力学响应与界面失效机制开展了系统研究。重点分析了初始法向载荷(Fsd)、剪切位移幅值(ud)、加载频率(f)及岩性对剪切荷载、法向位移、剪切磨损特征以及应变场演化的影响规律。试验结果表明,随着Fsd从7.5 kN增加至120 kN,峰值和残余剪切荷载均呈上升趋势,增幅分别为1.98%~35.25%和32.09%~86.74%。循环剪切过程中,单个周期的最大剪切力先逐渐衰减,再趋于稳定,表明剪切磨损主要发生在初始循环阶段。法向位移随剪切位移呈螺旋式减小,意味着持续的剪缩效应;螺旋曲线呈现“上疏下密”的特征,表明循环剪切后期以沿既有破裂面的动态滑移为主,且在煤岩中表现尤为明显。锚固系统的承载能力随岩石类型而异,分别受控于:煤岩中为煤本体强度,砂岩#1与砂岩#2中为树脂–岩石界面粘结强度,砂岩#3中则为树脂强度与树脂–岩石界面粘结强度的共同作用(砂岩#1,砂岩#2,砂岩#3的强度逐渐递增),而在石灰岩中主要受树脂强度与锚杆–树脂界面粘结强度的共同影响。循环剪切引起异性界面的明显损伤,表现为最大主应变场中应变局部化的不断集中和以树脂–岩石界面为主的脱黏失效,其界面损伤程度受岩石类型调控。

 

Dynamic mechanical responses and debonding failure mechanisms of a bolt–resin–rock anchoring system subjected to cyclic shear loading

Abstract: This study investigated the mechanical responses and debonding mechanisms of a bolt–resin–rock composite anchoring system subjected to cyclic shear loading. A systematic analysis was conducted on the effects of the initial normal load (Fsd), cyclic shear displacement amplitude (ud), frequency (f), and rock type on the shear load, normal displacement, shear wear characteristics, and strain field evolution. The experimental results showed that as Fsd increased from 7.5 to 120 kN, both the peak and residual shear loads exhibited increasing trends, with increments ranging from 1.98% to 35.25% and from 32.09% to 86.74%, respectively. The maximum shear load of each cycle declined over the cyclic shear cycles, with the rate of decrease slowing and stabilizing, indicating that shear wear primarily occurred at the initial cyclic shear stage. During cyclic shearing, the normal displacement decreased spirally with the shear displacement, implying continuous shear contraction. The spiral curves display sparse upwards and dense downward trends, with later cycles dominated by dynamic sliding along the pre-existing shear rupture surface, which is particularly evident in coal. The bearing capacity of the anchoring system varies with the rock type and is governed by the coal strength in coal, resin–rock bonding in sandstone#1 and sandstone#2, combined resin strength and resin–rock bonding in sandstone#3 (sandstone#1, sandstone#2 and sandstone#3, increasing strength order), and resin strength and bolt–resin bonding in limestone. Cyclic shear loading induces anisotropic interfacial degradation, characterized by escalating strain concentrations and predominant resin–rock interface debonding, with the damage severity modulated by the rock type.

 

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