# Simulation Tests on Granite Pillar Rockburst
## 1 Introduction
conducted numerous simulation experiments of real triaxial rockbursts in rocks with cavernous structures, achieving the slab cracking flexural rockburst phenomenon in circular caverns, straight-walled arched caverns, rectangular caverns, and other caverns, obtaining results that were consistent with the actual tunnel damage in the field [23; 24; 25]. [PERSON] et al. studied the strength failure mechanism of granite and its relationship with high temperature and high difference stress through a true triaxial compression test and evaluated its rockburst tendency according to the ultimate energy storage characteristics of deep-buried high geothermal tunnel granite [26]. [PERSON] et al. conducted true triaxial rockburst tests on rectangular prismatic coarse-grained granite and quantitatively analyzed the relationship between the loading rate, fractal dimension, and total energy dissipation [27]. [PERSON] et al. used a real triaxial test system to investigate the impact of the loading rate on rockburst in the surrounding rock of circular tunnels [28]. [PERSON] et al. established an orthogonal anisotropic thin plate mechanical model to derive the critical load value of plate fracture buckling rockburst under bidirectional stress circumstances by conducting acoustic emission monitoring tests [29]. [PERSON] et al. carried out tunnel rock explosion acoustic emission monitoring experiments and analyzed the tunnel rock explosion process macro-damage characteristics as well as rock explosion energy accumulation, release patterns, and the time effect of energy [30]. [PERSON] et al. conducted true triaxial rockburst tests on granite samples undergoing different initial damage temperatures, quantitatively analyzed the effects of initial temperature damage on the scale parameters, surface morphology, and microscopic cracks of rockburst fragments, and established the relationship between the peak rockburst strength and fractal dimension of fragments [31]. [PERSON] et al. conducted an experimental investigation of the rockburst occurrence mechanism using infrared imaging and acoustic emission technology [32]. [PERSON] et al. conducted theoretical and experimental investigations on the ejection velocity of shattered rock masses during rockbursts by employing dynamic Moore's circle analysis and true triaxial testing in order to anticipate the destructiveness of rockburst disasters [33]. [PERSON] et al. performed triaxial compression rockburst experiments with various stress gradients, and for precise morphological characterization, they used a scanning electron microscope to describe the damaged surface of the specimen [34]. [PERSON] et al. applied the RF-PA2D program to simulate the spatial distribution characteristics and event sequence characteristics of the microfracture-induced macrofracture process and microfracture-related acoustic emission event sources in rockbursts of ore pillars [35]. [PERSON] et al. used granite to carry out rockburst laboratory tests under true triaxial conditions, combined with the deformation characteristics of granite and acoustic emission technology, and revealed the evolution law of microcracks in the process of rockburst of granite [36]. Using the triaxial compression test of a 1000 m deep borehole in a mountain tunnel in Tibet, [PERSON] et al. conducted an experimental study on rockburst potential evaluation of the strength, deformation, failure, and energy evolution characteristics of granite under the coupling effect of high confining pressure and ground temperature and introduced the energy storage index to discuss the rockburst potential of granite [37]. It can be found that the above experimental studies are mostly focused on single-sided unloading strain rock explosion experiments and rock explosion experiments in the cavern and are less involved in the pillar-type rock explosion experiments. After the excavation of the underground ore body, such as the room-and-pillar mining method, the pillars are often on the four sides of the unloading and axial stress state.