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Experimental investigation and microscopic-element modeling of shear behavior in the initial non-contact state of jointed rock
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DOI：10.1016/j.compgeo.2026.108189.png)
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Abstract
En 中文
Although many experiments have examined the compaction phase in shear stress–displacement curves, the compaction behavior of jointed rocks remains poorly understood and inadequately captured by existing constitutive models. To address this gap, a microscopic-element-based Weibull damage shear constitutive model is proposed, explicitly incorporating the initial non-contact (compaction) stage of jointed rock masses. The proposed model effectively captures the evolution of shear behavior of diabase joints with five surface morphologies under three normal stress levels, with particular accuracy in the compaction phase. It uses seven physically meaningful parameters, which can be directly calibrated from experimental data to ensure practical applicability. To further validate the model, a series of direct shear tests were performed on artificial diabase joints with varying morphologies and normal stresses. Results indicate that both normal stress and surface morphology exert significant influence on shear responses, with normal stress notably affecting compaction behavior. The close agreement between model predictions and experimental observations confirms the reliability and predictive capability of the proposed model.
Keywords:
jointed rock
shear behavior
compaction phase
Weibull damage model
surface morphology