)1 School of The effect of in-situ stress on crack expansion resulting from blasting has been extensively studied by researchers using theoretical calculations and experiments over the past few decades. As an illustration, [PERSON] et al. analyzed the response of rock to blasting in situations of high pressure with a series of experiments; they recommended that two stages can be distinguished in the behavior of dynamic fracture: initiation and propagation. The initiation stage is primarily dominated by the stress transients generated by blasting, and the propagation stage is mainly controlled by high-stress conditions due to the rapid decay of these stress transients [7]. Numerous studies conducted using the dynamic caustics experimental method have shown that under initial confining pressure, stress concentrations of varying magnitudes are produced in the vicinity of the blasthole. Furthermore, with an increase in stress concentration, the propagation of blast-generated primary cracks is gradually deflected, aligning with the maximum principal stress direction at an increasing maximum deflection angle, and type II cracks become more prominent [8; 9]. The development of an elastodynamic framework by [PERSON] et al. was instrumental in improving the mechanical understanding of the dynamic behavior of rock caused by varying in-situ stresses by enabling the exploration of blast wave propagation in pre-stressed rock [10]. [PERSON] et al. examined the stress concentration phenomenon around a blasthole under high static stress conditions using a theoretical analysis of stress distribution and then utilized a dynamic caustics experimental approach to explore how slit orientations and high static stress conditions influence the behavior of cracks caused by slit charge blasting [11]. [PERSON] et al. observed that the attenuation effect of jointed rock on stress waves increased as in-situ stress levels rose, corresponding to an enhanced attenuation by intact rock and a weakened attenuation by rock joints [12]. [PERSON] et al. used the digital image correlation (DIC) technique to study the evolution of the strain field of rock blasting under high stress [13]. To sum up, the aforementioned studies demonstrate that the in-situ stresses play a substantial role in both the creation and spread of cracks caused by blast loading. Several interesting results have been obtained from numerical studies on rock responses considering in-situ stress and blast loading. [PERSON] et al. calibrated the parameters of the Jones-Wilkins-Lee (JWL) equation of state using cylinder expansion tests to provide a numerical evaluation of the damage propagation under confining pressure. [1]. Through numerical simulations of blasting on a rock slope, [PERSON] et al. discovered that the effect of repeated blast loading on rock damage was minimal in the minimum principal stress direction. Notably, by employing a plum-shaped blasthole arrangement and delayed detonation, it is possible to achieve better blasting results in pre-stress conditions [14]. [PERSON] et al. conducted 3D finite difference numerical simulations of the dynamic behavior of rock to discuss the impact of anisotropic in-situ stresses and loading rate considering explosive types and site conditions [15]. Under the in-situ stress environment, [PERSON] et al. suggested that the compressive stress induced by blast loading can be increased while the corresponding tensile stress can be reduced [16]. The impact of the lateral pressure coefficient and the isotropic stress field on crack behavior triggered by cut blasting was investigated by [PERSON] et al. with the Riedel-Hiermaier-Thoma (RHT) model in LS-DYNA. The authors then proposed a design approach for cut blasting in high-stress environments [17]. [PERSON] et al. Figure 1: Properties of static stress in the coal pillar subjected to an overlying hard roof. examined how fault orientation affects the fracturing of rock masses when subjected to high in-situ stresses.