Experimental results of blast-induced cracking fractal characteristics and propagation behavior in deep rock mass. (June 2021)

• Record Type: Journal Article
• Authors: Ding, Chenxi; Yang, Renshu; Yang, Liyun
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 142(2021)
• Publication Date: 2021-06
• Subjects: In-situ stress -- Blast-induced crack -- Fractal dimension -- Damage degree -- Crack propagation; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2021.104772
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: Herein, static stress is used to simulate high in-situ stress in a deep rock mass. The effect of this stress on the fractal characteristics and propagation behavior of blast-induced cracking are analyzed using a laboratory model experimental method combined with fractal theory, a dynamic caustics method and high-speed camera technology. The results show that the static stress increases the fractal dimension of the blast-induced crack and the degree of damage to the medium. Static stress also has a guiding effect on the blast-induced crack propagation, causing the distribution of the blast-induced crack to be more complicated. Under the combined action of static stress and blasting stress, the fractal characteristics of the blast-induced cracking in different ranges of the fracture zone exhibit significant differences. Larger static stress increases the stress concentration at the tip of the blast-induced crack, allowing the blast-induced crack to propagate at a higher velocity in the direction of the static stress and form a longer length.