Energy Accumulation Characteristics and Induced Rockburst Mechanism of Roadway Surrounding Rock under Multiple Mining Disturbances: A Case Study

Abstract

The source of energy release when rockburst occurs must be determined to understand the mechanisms underlying disaster formation and achieve accurate prevention and control. Although previous research has systematically investigated the energy source underlying rockburst from different perspectives, issues such as an unclear understanding of the energy accumulation state and inaccurate positioning of the energy release source remain to be resolved. In this study, the “1·17” major roof accident in the Danshuigou Mine was used as the background to evaluate and analyze the stress environment and energy accumulation characteristics of roadway surrounding rock under multiple mining disturbances, and the results showed that a super energy package occurs in the surrounding rock of the mining roadway. Subsequently, the evolution process of energy in this region and the mechanism of induced rockburst were elaborated. The results showed that the degree of stress concentration in the surrounding rock of the roadway will increase several times as the number of mining disturbances increases. Under the influence of multiple mining disturbances, the maximum principal stress peak of the surrounding rock of the roadway can reach 5–10 times the maximum principal stress value outside the mining-affected area. A large amount of elastic energy was accumulated in the rock surrounding the roadway, and super-high-density energy packages were formed locally. The maximum energy density value reached 50–185 times the value observed in areas outside the mining-affected zone. Thus, rockburst may be induced when the large amount of energy accumulated in the super energy package is suddenly and violently released; moreover, the degree of energy accumulation in the super energy package is likely closely related to the magnitude of rockburst. These results have important theoretical significance and application value for clarifying the mechanism of rockburst and improving the effectiveness of rockburst prediction and prevention.

Occurrence mechanism and prevention technology of rockburst, coal bump and mine earthquake in deep mining

“…In addition, there are other contributing factors to the occurrence of coal bumps: mining depth, hard roof fracture (Gao et al 2020), stress construction coal body fracture (Junjun et al 2016), fault slip (Lu et al 2018), engineering blasting (Wojtecki et al 2017) and mining disturbance (Ma et al 2023), etc. The induced factors of coal bump in coal mining are shown in Fig.…”

“…The detonation of explosives within rock strata generates potent shock waves and stress waves that propagate in all directions, which causes vibration of the rock medium or even induced coal bump. (Lu et al 2018;Gao et al 2020;Feng et al 2016;Ma et al 2023;Wojtecki et al 2017) Mining disturbances cause a constant redistribution of the stress field and accumulate energy within the coal-rock body, which induces coal bump.…”

Mechanism of rockburst induced by roadway repair under intense mining: a case study

“…Rockbursts, a type of mining pressure manifestation (Cai et al, 2020;Wang et al, 2020;Xuan et al, 2023), are major mining disasters (especially deep mining) that seriously threaten the production safety of coal mines (Dai et al, 2021;Dou et al, 2022;Pan et al, 2023). A rockburst is a dynamic disaster caused by the sudden release of energy accumulated in the rock surrounding a roadway or the surrounding coal and rock mass of a mining face (Jiang et al, 2023;Ma et al, 2023;Qi et al, 2023;Wu et al, 2023). Briefly, it is a sudden failure of the coal and rock mass that usually does not have apparent macroscopic precursors.…”

Data Preprocessing and Machine Learning Modeling for Rockburst Assessment

“…The fragmentation and collapse of surrounding rock can damage stratum integrity and stability. Moreover, new water passage may form in the broken rock layer, altering groundwater flow and impacting ecosystem stability [4,5]. Consequently, predicting rockbursts is of utmost importance to mitigate these adverse consequences, enhance environmental management efficiency, and promote sustainable development.…”