Abstract
The failure of rock joints is one of the potential causes for the local and general rock instability, which may trigger devastating geohazards such as landslide. In this paper, the Distinct Element Method (DEM) featured by a novel bond contact model was utilized to simulate shear behaviour of centre/non-coplanar rock joints. The DEM results show that the complete shear behaviour of jointed rock includes four stages: elastic shearing phase, crack propagation, the failure of rock bridges and the through-going discontinuity. The peak shear strength of centre joint increases as the joint connectivity rate decreases. For intermittent noncoplanar rock joints, as the inclination of the rock joints increases, its shear capacity decreases when the inclination angle is negative while increase when positive. Comparison with the experimental results proves the capability of this DEM model in capturing the mechanical properties of the jointed rocks.
Highlights
Shear failure of rock joints can induce the instability of rock mass, a common medium in the field of mining, oil exploitation, water conservancy and hydropower
The Distinct Element Method (DEM) results show that the complete shear behaviour of jointed rock includes four stages: elastic shearing phase, crack propagation, the failure of rock bridges and the through-going discontinuity
The DEM rock sample containing 10,000 particles was generated by Under-compaction Method (UCM) proposed by Jiang et al [18], with maximum, minimum and average diameters being 2.0, 0.5 and 1.3 mm respectively
Summary
Shear failure of rock joints can induce the instability of rock mass, a common medium in the field of mining, oil exploitation, water conservancy and hydropower. Bewick et al [12] investigated mechanism of rupture by comparing DEM direct shearing result with experimental one under different normal pressures. A new DEM bond model proposed by one of the authors has been adopted to simulate mechanical response of jointed rock mass under direct shearing condition. Where f=(Fbn+Rbt)/(Rbt+Rbc) is the stress ratio, which can be used to define the types of bond failures: when f = 0, compressive failure occurs; when 0 < f < 1, tensile-shear-torsional failure (Fn < 0) or compressive-shear-torsional failure (Fn > 0) occurs; when f = 1, tensile failure occurs; μb and μp are friction coefficients of bonds and particles; βb and βp are rolling resistance coefficients of bonds and particles; fs, fr, gs and gs are the envelope shape factors; is the common radius of two particles in contact and kpn is inter-particle normal contact stiffness. Which contain two terms corresponding to bond and inter-particle components
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