# A Study on the Roof-Cutting and Pressure Releasing Technology of Roof Blasting
## 1 Introduction  
Rock bursts are among the most devastating disasters in an engineering project due to the extensive safety risks to the mine, workers, and surface infrastructure. Researchers have performed extensive research on preventing rock bursts, and stress release has become one of the effective technical ways to solve this engineering problem [1]. Stress relief and seismicity monitoring are essential to rock-burst prevention during coal mining [2] and deep-underground construction under high horizontal stress conditions [3].  
Many experts have studied stress relief as a preventative measure. [PERSON] [4] achieved stress relief by optimizing the pre-split blasting spherical cartridge parameters. [PERSON] [5] compared equivalent blasting effects to determine the law of crack propagation and stress wave attenuation in coal by high-pressure air blasting. [PERSON] [6] optimized the blasting parameters, and the truncated blasting plan achieved an excellent crack-forming effect. The estimation model of blast-broken and cracked areas was also studied by [PERSON] [7], who showed the most critical parameters affecting these two areas and established a newcrack dynamic driving model (CDD Model) based on the combined coupling effect. The feasibility and rationality of the model in characterizing the dynamic cracking process are verified through numerical simulation and laboratory testing. [PERSON] [8] proposed a similar model of rock blasting under a unidirectional load with transparent model materials. It was shown that the initial stress suppressed the propagation length and velocity of the main radial cracks. [PERSON] [9] utilized the empty hole effect to generate stress concentration between the borehole and the empty hole to achieve directional cracking. [PERSON] [10] found that the stress-relieving effect of a water medium is greater than that of an air-filled medium by comparing the uncoupled water-filled and air-filled blasting tests. [PERSON] [11] used LS-DYNA to simulate the development of cracks between boreholes and revealed the rationality of optimizing blasting parameters. [PERSON] [12] established \"F-shaped\" and \"L-shaped\" stress source structure models of the deep gob-side multi-pillar entry and revealed the occurrence mechanism of rock bursts. [PERSON] [13] proposed a new combined support strategy of optimizing roadway layout, designing impact-resistant support systems, and local reasonable pressure relief with good application results. [PERSON] [14] pointed out that the non-penetrating fracture zone formed through pressure relief blasting increases the stress concentration of the surrounding rock of the roadway, which is unfavorable for engineering safety. [PERSON] [15] analyzed the drilling pressure-relief effect of the surrounding rock at different borehole positions and borehole depths. The stress evolution process of the surrounding rock after excavation was obtained.  
The above research provided several methods for alleviating the rock-burst risk of the cavern, but it mainly focused on parameter optimization and rock-breaking mechanism research. There is little research on the impact of rock blasting range on stress release. Therefore, this paper combines numerical simulation and field tests to analyze the range of the rock damage zone, stress propagation characteristics, and energy distribution under the action of high-stress confining pressure. The research results have a guiding significance for preventing and controlling disasters such as rock bursts.