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Macro-micro damage characteristics and entire-process fracture damage model of jointed rock mass after damaged by cyclic loading and unloading
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DOI：10.1016/j.tafmec.2026.105639.png)
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Abstract
En 中文
Jointed rock masses are often exposed to cyclic loading and unloading conditions. Accurately assessing the influence of cyclic loading damage on the strength and deformation properties of jointed rock masses under subsequent loading conditions is of great engineering significance. Cyclic loading tests were performed on jointed rock masses, followed by subsequent uniaxial loading tests on the damaged jointed rock masses. Through a comprehensive analysis of pore characteristics, micro-crack propagation, and the fracture propagation process of structural surfaces, this study investigated the macro- and meso-scale damage evolution patterns in jointed rock masses under subsequent loading conditions induced by cyclic loading-unloading damage. Taking into account the compaction deformation and fracture toughness deterioration during the loading-unloading phases, along with the joint damage and the evolution of rock mass skeleton damage in subsequent loading stages, a macromicroscopic damage model for jointed rock masses subjected to cyclic loading-unloading has been established. The research findings demonstrate that cyclic loading mainly increases the micro-pore content in rock masses while having minimal impact on large and medium-sized pores. Cyclic loading damage has a negligible effect on the deformation modulus of rock masses but a significant impact on their peak strength. The cyclic loadinduced damage minimally affects the deformation modulus of jointed rock masses but significantly reduces their peak strength. The number of acoustic emission events during the stable damage stage of rock masses decreases as the number of cycles increases. Cyclic loading decreases the initiation strength of jointed rock masses, with more significant reductions observed in the accelerated propagation strength of wing cracks as the number of cycles increases. Changes in joint length simultaneously affect both compaction damage and fracture damage in rock masses, whereas changes in joint thickness primarily influence compaction damage.
Keywords:
Jointed rock mass
Damage model
Cyclic loading and unloading
Pore structure
Fracture toughness
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