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Rock Mechanics and Rock Engineering

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31.08.2023 | Original Paper

Insight and Effectiveness of Working-Face Deep-Hole Blasting for Prevention of Strong Seismicity Induced by Deep Coal Mining

verfasst von: Kunbo Wu, Junpeng Zou, Yu-Yong Jiao, Shijing He, Guangmin Wang

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 12/2023

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Abstract

The grand-scale suspended roofs overlying the goaf are commonly developed under thick-hard rock strata (THRS) during the mining process of the deep coal seam. As a result, strong mine seismicities triggered constantly by deep mining have impeded severely the safety and efficient operation of deep mines. The working-face deep-hole blasting technology has been utilized to weaken the roof for releasing the mine pressure, thereby reducing the risk of violent dynamic hazards. In this paper, Dongtan deep coal mine is taken as an example, the radius of rock failure regions induced by blasting is calculated based on the expansion theory of cylindrical charges. LS-DYNA and UDEC7.0 softwares are employed to simulate the rock pre-splitting and overburden migration under the working-face deep-hole blasting, and the roof pre-splitting and pressure relief mechanism of the working-face deep-hole blasting are revealed. According to the micro-seismic, support working resistance and real-time stress monitoring results, the working-face deep-hole blasting technology could actively break the integrity of the roof. Using the blasting, high-energy mining-induced seisms are decreased dramatically or disappeared fully. The advanced abutment pressure of the coal seam decreases with the increase of the working-face deep-hole blasting time, which indirectly indicates that the weakening degree of the thick-hard roof gradually increases under the action of multiple blasting. The working-face deep-hole blasting technology has achieved the desired effect in the pressure relief in hard suspended roofs for preventing and controlling strong mining-induced seismicity.

Vorheriger Artikel Phase Transition in Geomaterials Under Unsaturated Conditions

Nächster Artikel Effect of Relative Humidity on the Creep Rate of Rock Salt at Intermediate–Low Stresses

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Titel: Insight and Effectiveness of Working-Face Deep-Hole Blasting for Prevention of Strong Seismicity Induced by Deep Coal Mining
verfasst von: Kunbo Wu
Junpeng Zou
Yu-Yong Jiao
Shijing He
Guangmin Wang
Publikationsdatum: 31.08.2023
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 12/2023
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-023-03516-8

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