低频重复扰动下预加应力结构面变形破坏特性试验研究

doi:10.13722/j.cnki.jrme.2022.0955

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摘要深部围岩结构面常处于较高的应力作用下，在爆炸冲击引起的扰动作用下极易诱发失稳。为揭示结构面在强度极限邻域内的扰动剪切失稳特性，采用对称剪切试件对不同起伏角的规则齿形结构面开展不同初始应力、扰动峰值、扰动频率条件下的扰动剪切试验，分析结构面扰动失稳的变形规律和能量演化特征。试验结果表明：同类型结构面的扰动失稳位移与准静载条件下的失稳位移相差不大，不可逆位移累积曲线呈现“三阶段”的特征；初始应力状态控制着结构面的失稳位移量值；高初始应力、高扰动幅值、低扰动频率条件下失稳更容易发生；扰动变形过程中加载能量与卸载可恢复能量呈现“双向背离”特征。

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	杨嘉楠
	范鹏贤
	王明洋

关键词 ：岩石力学, 预加应力结构面, 低频扰动, 强度极限邻域, 不可逆位移, 能量演化

Abstract：When disturbed by blast impacts，the high-stress deep surrounding rock joints tend to induce instability failure. To investigate the disturbance shear instability characteristics of rock joints in the neighborhood of strength limit，a series of disturbance shear tests under different initial stresses，disturbance peaks and disturbance frequencies were carried out on symmetrical regular dentate rock joints. The deformation and energy evolution laws of rock joints in the process of disturbance instability were also analyzed. Test results show that the disturbance instability displacement of same rock joints is close to that under quasi-static loading and the cumulative curve of irreversible deformation presents in three stages. Instability displacement of rock joints is controlled by the initial stress state，and the instability is more likely to occur under high initial stress，high disturbance peak and low disturbance frequency. The loading energy and unloading recoverable energy show the “two-way deviation” feature during the deformation process.

Key words： rock mechanics pre-stressed joints low frequency disturbance strength limit neighbourhood irreversible deformation energy evolution

引用本文:

杨嘉楠，范鹏贤，王明洋 . 低频重复扰动下预加应力结构面变形破坏特性试验研究[J]. 岩石力学与工程学报, 2023, 42(7): 1720-1730.
YANG Jianan，FAN Pengxian，WANG Mingyang. Deformation and failure characteristics of pre-stressed joints under repeated low frequency disturbances. , 2023, 42(7): 1720-1730.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0955 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I7/1720

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