View in EDS

Regulation Mechanism of Shear Mechanical Signal and Failure Evolution of Rock Structural Plane with the Influence of Normal Stress and Roughness.

Saved in:
Bibliographic Details
Title: Regulation Mechanism of Shear Mechanical Signal and Failure Evolution of Rock Structural Plane with the Influence of Normal Stress and Roughness.
Authors: Li, Yajing1 (AUTHOR) 112508010007@home.hpu.edu.cn, Feng, Wenlin1 (AUTHOR) fengwenlin@hpu.edu.cn, Qiao, Chunsheng2 (AUTHOR) 18800107021@139.com, Yu, Mingyuan3 (AUTHOR) yuminyuan@mail.tsinghua.edu.cn
Source: International Journal of Geomechanics. Aug2026, Vol. 26 Issue 8, p1-13. 13p.
Subject Terms: *Acoustic emission, *Interfacial roughness, *Strains & stresses (Mechanics), *Rock mechanics, *Structural failures, *Shear strength, *Structural geology
Abstract: Shear failure of rock structural planes, a critical trigger for rock mass instability, is determined by coupled effects of roughness and normal stress. Existing studies have not thoroughly investigated the multiparameter synergistic regulatory mechanism of structural plane shear mechanical signal [acoustic emission (AE)] and failure evolution. This study examines multifactor synergistic control using structural plane shear testing, AE monitoring, and digital image techniques. The results show that AE counts increase linearly with increasing roughness, while AE escalation becomes nonlinear with growing normal stress. The prepeak nonlinear stage has the most AE energy per signal, followed by the linear elastic stage with the lowest. AE energy per signal constantly rises with increasing roughness and normal stress. The duration time per AE signal is greatest in the prepeak nonlinear stage, increasing gradually with increasing roughness; however, the rate of increase slows with increasing normal stress. The b value has an inverse association with normal stress magnitude but has a positive correlation with roughness features. Under low stress and roughness, shear failure is mostly wear-based, with concomitant AE signals manifesting as high-frequency, low-energy events. In contrast, at high stress and roughness levels, gnawing becomes the major failure mechanism, as seen by AE signals with low-frequency, high-energy bursts. These findings reveal that roughness and normal stress collaborate to govern AE signs via interfacial contact mechanics change, and they provide important insights for forecasting shear-induced structural plane failures in rock engineering situations. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Description
Abstract:Shear failure of rock structural planes, a critical trigger for rock mass instability, is determined by coupled effects of roughness and normal stress. Existing studies have not thoroughly investigated the multiparameter synergistic regulatory mechanism of structural plane shear mechanical signal [acoustic emission (AE)] and failure evolution. This study examines multifactor synergistic control using structural plane shear testing, AE monitoring, and digital image techniques. The results show that AE counts increase linearly with increasing roughness, while AE escalation becomes nonlinear with growing normal stress. The prepeak nonlinear stage has the most AE energy per signal, followed by the linear elastic stage with the lowest. AE energy per signal constantly rises with increasing roughness and normal stress. The duration time per AE signal is greatest in the prepeak nonlinear stage, increasing gradually with increasing roughness; however, the rate of increase slows with increasing normal stress. The b value has an inverse association with normal stress magnitude but has a positive correlation with roughness features. Under low stress and roughness, shear failure is mostly wear-based, with concomitant AE signals manifesting as high-frequency, low-energy events. In contrast, at high stress and roughness levels, gnawing becomes the major failure mechanism, as seen by AE signals with low-frequency, high-energy bursts. These findings reveal that roughness and normal stress collaborate to govern AE signs via interfacial contact mechanics change, and they provide important insights for forecasting shear-induced structural plane failures in rock engineering situations. [ABSTRACT FROM AUTHOR]
ISSN:15323641
DOI:10.1061/IJGNAI.GMENG-13240