Nondestructive testing on cumulative damage of watery fractured rock mass under multiple cycle blasting

Precise control of casting velocity and effective throwing kinetic energy conversion efficiency in blasting engineering are challenges. To provide a theoretical basis and reference for the implementation plan and fine construction of the cast blasting project, we study the problems of casting velocity and energy consumption ratio of broken rock under the impact load of explosions in this manuscript. The calculation methods of casting velocity and throwing energy of broken rock under two blasting modes of spherical charge and cylindrical charge are established by using the theory of dimensional analysis and rock breaking by blasting. A large number of model tests are carried out by using high-speed photography. The results indicate that the casting velocity of broken rock after explosive initiation has two evident stages: instantaneous acceleration to a certain value and subsequent fluctuation; the velocity presents an ordinary distribution law with the step height, and the fitting correlation of high-speed photography results is more than 91%. With the minimum burden increasing from 0.12 m to 0.2 m, the energy consumption decreases from 1306.88 J to 747.49 J and the proportion of energy consumption decreases from 14.77% to 8.45%.

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“…Then, the equation for calculating the kinetic energy of throwing can be transformed by Equation (20), shown as follows.…”

Section: Casting Velocity Distribution Mechanismmentioning

confidence: 99%

“…et al [17,18] designed several sets of blasting model tests and a blasting plan ensuring the cutting effect was obtained. Liu D.W. et al [19,20] conducted rock-like material model tests, and the non-linear change law of rock mass damage and the advantages of V-shaped grooves were proposed. Qiu J.D.…”

Section: Introductionmentioning

confidence: 99%

Calculation Method of the Blasting Throwing Energy and Its Variation Affected by the Burden

et al. 2022

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Influence of material heterogeneity on the blast-induced crack initiation and propagation in brittle rock

Wang

2023

Computers and Geotechnics

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A fully coupled thermomechanical peridynamic model for rock fracturing under blast loading considering initial pore damage

Zhang,

Dai

2024

Computers and Geotechnics

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Nondestructive testing on cumulative damage of watery fractured rock mass under multiple cycle blasting

Cited by 9 publications

References 27 publications

Calculation Method of the Blasting Throwing Energy and Its Variation Affected by the Burden

Calculation Method of the Blasting Throwing Energy and Its Variation Affected by the Burden

Influence of material heterogeneity on the blast-induced crack initiation and propagation in brittle rock

A fully coupled thermomechanical peridynamic model for rock fracturing under blast loading considering initial pore damage

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