Abstract
To investigate the damage fractal and energy dissipation of dolomite marble under blasting load, Dahongshan Copper Mine was selected as the test object and one-dimensional SHPB impact tests with different strain rates were carried out. The dynamic compressive strength, damage morphology, fractal fragmentation, and energy dissipation of the rock were analyzed. The results showed that the absorbed energy per unit volume and the crushing energy per unit mass of dolomite marble are closely related to the dynamic compressive strength. The fractal dimension D of dolomite marble increases with increasing strain rate, and the smaller the average block size of the rock, the degree of crushing deepens. In addition, as the incident energy increases, the crushing energy of the rock also increases, and the energy dissipation intensifies. Finally, after comparative analysis, the reasonable strain rate range is 68.14–77.61 s−1, and the reasonable specific energy absorption value range is 0.65–0.98 J/cm3. The fractal pattern of rock deformation and damage can be reasonably explained from the perspective of energy dissipation.
Highlights
Blasting has been an indispensable technology in current mining methods [1,2,3]. erefore, it is vital to study the impact of blasting stress waves on the surrounding rock mass as well as the process of rock damage and the mechanism of fragmentation
Dynamic mechanical characteristics and energy consumption regularities of rocks are involved in various engineering fields and natural disasters, such as roadway excavation, hydraulic engineering excavation, underground mine mining, earthquakes, and landslides. is geological engineering has enabled the vigorous development of rock dynamics and related disciplines, and has gradually attracted the attention of the field of rock and soil mechanics [4]
Ding et al [8] combined fractal theory, dynamic caustics, and high-speed photography to analyze the influence of static stress. e results showed that the static stress accelerates the propagation speed of explosion cracks in the direction of larger static stress, and the propagation length is longer
Summary
Blasting has been an indispensable technology in current mining methods [1,2,3]. erefore, it is vital to study the impact of blasting stress waves on the surrounding rock mass as well as the process of rock damage and the mechanism of fragmentation. Erefore, it is vital to study the impact of blasting stress waves on the surrounding rock mass as well as the process of rock damage and the mechanism of fragmentation. Dynamic mechanical characteristics and energy consumption regularities of rocks are involved in various engineering fields and natural disasters, such as roadway excavation, hydraulic engineering excavation, underground mine mining, earthquakes, and landslides. There have been many valuable research results on the dynamic mechanical characteristics and energy dissipation regularities of rocks [7]. E test results showed that the fragments produced by rock fragmentation under impact load have fractal characteristics. E results showed that the filling medium acts as a buffer, attenuates the blast energy transfer, and inhibits the formation and development of the fracture zone.
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