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Effects of In-Situ Stress on Damage and Fractal during Cutting Blasting Excavation

Authors :
Yongbo Wu
Xiaojun Zhang
Zhuo Li
Wenxue Gao
Zehui Xu
Yifeng Zhang
Jiguo Zhou
Source :
Fractal and Fractional, Vol 8, Iss 8, p 450 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Blasting excavation of rock masses under high in-situ stress often encounters difficulties in rock fragmentation and a high boulder rate. To gain a deeper understanding of this issue, the stress distribution of rock masses under dynamic and static loads was first studied through theoretical analysis. Then, the ANSYS/LS-DYNA software was employed to simulate the blasting crack propagation in rock masses under various in-situ stress conditions. The fractal dimension was introduced to quantitatively analyze the influence of in-situ stress on the distribution of blasting cracks. The results indicate that in-situ stress primarily affects crack propagation in the later stages of the explosion, while crack initiation and propagation in the early stages are mainly driven by the explosion load. In-situ stress significantly influences the damage area and fractal dimension of cut blasting. Under hydrostatic in-situ stress, as the in-situ stress increases, the damage area and fractal dimension of blasting cracks gradually decrease. Under non-hydrostatic in-situ stress, when the principal stress difference is small, in-situ stress promotes the damage area and fractal dimension of the surrounding rock, enhancing rock fragmentation. However, when the principal stress difference is large, in-situ stress inhibits the damage area and fractal dimension of the surrounding rock, hindering effective rock breaking.

Details

Language :
English
ISSN :
25043110
Volume :
8
Issue :
8
Database :
Directory of Open Access Journals
Journal :
Fractal and Fractional
Publication Type :
Academic Journal
Accession number :
edsdoj.42dff266d2b74371b5a1d445c997e4fd
Document Type :
article
Full Text :
https://doi.org/10.3390/fractalfract8080450