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

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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
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  Availability: 0
Header DbId: enr
DbLabel: Energy & Power Source
An: 194606762
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Regulation Mechanism of Shear Mechanical Signal and Failure Evolution of Rock Structural Plane with the Influence of Normal Stress and Roughness.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Yajing%22">Li, Yajing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 112508010007@home.hpu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Feng%2C+Wenlin%22">Feng, Wenlin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fengwenlin@hpu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Qiao%2C+Chunsheng%22">Qiao, Chunsheng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> 18800107021@139.com</i><br /><searchLink fieldCode="AR" term="%22Yu%2C+Mingyuan%22">Yu, Mingyuan</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> yuminyuan@mail.tsinghua.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Geomechanics%22">International Journal of Geomechanics</searchLink>. Aug2026, Vol. 26 Issue 8, p1-13. 13p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Acoustic+emission%22">Acoustic emission</searchLink><br />*<searchLink fieldCode="DE" term="%22Interfacial+roughness%22">Interfacial roughness</searchLink><br />*<searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Rock+mechanics%22">Rock mechanics</searchLink><br />*<searchLink fieldCode="DE" term="%22Structural+failures%22">Structural failures</searchLink><br />*<searchLink fieldCode="DE" term="%22Shear+strength%22">Shear strength</searchLink><br />*<searchLink fieldCode="DE" term="%22Structural+geology%22">Structural geology</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1061/IJGNAI.GMENG-13240
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 1
    Subjects:
      – SubjectFull: Acoustic emission
        Type: general
      – SubjectFull: Interfacial roughness
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Rock mechanics
        Type: general
      – SubjectFull: Structural failures
        Type: general
      – SubjectFull: Shear strength
        Type: general
      – SubjectFull: Structural geology
        Type: general
    Titles:
      – TitleFull: Regulation Mechanism of Shear Mechanical Signal and Failure Evolution of Rock Structural Plane with the Influence of Normal Stress and Roughness.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Li, Yajing
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          Name:
            NameFull: Feng, Wenlin
      – PersonEntity:
          Name:
            NameFull: Qiao, Chunsheng
      – PersonEntity:
          Name:
            NameFull: Yu, Mingyuan
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      – BibEntity:
          Dates:
            – D: 01
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 15323641
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            – Type: volume
              Value: 26
            – Type: issue
              Value: 8
          Titles:
            – TitleFull: International Journal of Geomechanics
              Type: main
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