.png){kind=icon}
.png){kind=icon}
Return
Influence of Dynamic Normal Load on Shear Failure Mechanism of Rock Joints: Experimental and Numerical Investigations
.png){kind=icon}
PRE
AI
X
L
C
Y
Z
C
J
DOI：10.1007/s00603-026-05819-y.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Dynamic loads induced by seismic events, blasting, and excavation disturbances pose significant threats to the stability of jointed rock masses. This study examines the shear mechanical behavior of rough joints under dynamic normal load (DNL) boundary conditions, combining laboratory shear tests with discrete element method (DEM) simulations. The effects of different joints morphology and initial normal stress on shear strength, failure patterns, acoustic emission (AE) characteristics, contact anisotropy and phase shift phenomena were systematically investigated under DNL conditions of dynamic load parameters with frequency of 1.0 Hz and amplitude of 0.5 MPa. On comparing with constant normal load (CNL) conditions, the macroscopic evolution of shear stress under DNL is similar, yet a distinct phase shift is observed among normal stress, shear stress, and the friction coefficient. The phase difference between the friction coefficient and normal stress shows a positive correlation with the joints roughness coefficient (JRC). The influence of dynamic load on peak shear strength demonstrates a dual effect, enhancement or reduction, closely associated with failure modes, with strengthening and weakening effects being most pronounced at lower initial normal stress levels. Additionally, the dynamic load accelerates damage during the initial shear stage, promotes a transition in rupture mode from tensile to shear, and shifts part of the wear mechanism toward a damage mode dominated by asperity shearing and localized fragmentation. Analysis of anisotropy evolution reveals that dynamic loading increases the total number of microcracks and promotes crack propagation perpendicular to the joint direction. It also significantly amplifies the fluctuation amplitude of anisotropy parameters during shearing, facilitating dynamic contact redistribution and reconstruction of the force chain network.
Keywords:
Dynamic normal load
Shear behavior
Failure mechanism
DEM simulation
Acoustic emission
Journal
IF:
6.6
Papers:
6.0K
Citations:
3.0W
Organization
Cited Papers