Abstract
Abstract: In order to reveal the internal stress distribution and failure characteristics of pre-existing cylindrical cavity in granite under triaxial cyclic loading, bonded particle models containing cavity were established to investigate the variation of crack propagation, stress distribution, micro-cracks number, elastic modulus and poisson's ratio with the increase of cavity diameter. The results show that the cavity diameter has a significant effect on the tensile crack, compression-shear failure zone and compressive stress distribution. The peak strength decreases as the diameter of the cavity increases. However, the number of cracks increases and the plastic deformation increases more obviously. With the increase of the cyclic axial stress, the decreasing rate of the elastic modulus shows the rule of ‘first slow, fast later’, and the poisson's ratio increases. The distribution of local stress of σ1, σ2 and σ3 well explains the behavior of the cracking surrounding the circular cavity.
Highlights
In the process of rock mass excavation and mineral mining (Yang et al, 2017; Wang et al, 2019; Zhang et al, 2019; Zhao et al, 2019b), an excavation damage zone will be formed in the surrounding rock within a certain range of the cave (Salehnia et al, 2015)
In order to provide a theoretical basis for the stability and safety of rock masses in engineering contexts, physical experiments and scanning electron microscopy (SEM), Computed Tomography (CT), Acoustic emission (AE), and numerical simulation have been carried out on artificial jointed rock (Zhao et al, 2017b; Peng et al, 2019b; Zhao et al, 2019a) or rock-like materials (Zhao et al, 2016; Lin et al, 2019a)
According to laboratory experiments and numerical simulations conducted by Fakhimi et al (2002), Huang et al (2018), and Zhao et al (2014), it can be concluded that the failure characteristics and crack propagation are determined by the shape, size, and angle of the prefabricated holes
Summary
In the process of rock mass excavation and mineral mining (Yang et al, 2017; Wang et al, 2019; Zhang et al, 2019; Zhao et al, 2019b), an excavation damage zone will be formed in the surrounding rock within a certain range of the cave (Salehnia et al, 2015). Chen et al (2017) carried out uniaxial compression experiments on sandstone samples containing double fissures and a single circular hole and studied the effects of rock bridge angle and crack angle on the mechanical properties and fracture evolution characteristics. Xie et al (2011) conducted systematic experimental studies of rock specimens with a preexisting circular opening under uniaxial, biaxial, and triaxial loading conditions and analyzed the failure process of the samples by means of numerical simulation. Particle flow code (PFC3D) was used to conduct numerical simulation research on the granite with a cavity model under triaxial cyclic loading. The simulated crack propagation is basically analogous to the experimental results
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