Abstract
This article aiming at the lack of research on the influence of rock clamp production on cutting blasting under high in-situ stress conditions and the lack of rock damage criteria for RHT constitution in numerical simulation. Combined with the critical rock damage criterion and the embedded function of RHT constitution, the criterion for determining the critical damage of rock in RHT constitutive was studied, and the mechanical parameters of Metamorphic sodium lava were substituted to obtain the critical damage threshold of rock in numerical simulation. The smooth particle hydrodynamics (SPH) method was used to numerically simulate and analyze the influence of different rock clamping coefficients on the rock damage range and the cavity area in the cutting blasting. The stress state applied by the numerical simulation was inversely deduced by the field test scanning results to simulate the rock clamping coefficient Kr at the corresponding depth. The relationship between the cavity area Sc and the free surface distance Df is analyzed and established. The results show that the rock clip production has an inhibitory effect on the development and propagation of blast-induced cracks. The stress applied in the numerical simulation affects the range and development degree of cracks, and the cracks generated by the explosion are mainly circumferential cracks. The larger coefficient of rock clip production, the more obvious the inhibitory effect on cut blasting, the less the blast-induced cracks and the smaller the rock damage circle. The fitting results show that the curve fitting degree is about 0.94, which proves the accuracy of Sc-Df curve, and provides important reference value for the design of one-time completion blasting of upward blind shaft.
Highlights
The demand for metal materials in various industries is gradually increasing as science and technology advance
Many scholars have carried out a series of field tests and numerical simulations for rock blasting under high in-situ conditions [1,2,3,4,5]
To study the characteristic law of rock damage and cutting cavity formation under high in-situ stress in upward blind cutting blasting using the smooth hydrodynamic method (SPH method), and the results were compared with the field cavity scanning results to verify the accuracy of the numerical simulation, and the inverse extrapolation of the rock clamping performance in the test area was performed based on the field test results to investigate the influence law of rock clamping production
Summary
The demand for metal materials in various industries is gradually increasing as science and technology advance. Luo et al [18] proposed a blast damage simulation method based on normal impact load to study the blast damage incubation mechanism under different stress conditions, and concluded that a certain degree of in-situ stress plays a suppressive role on blast damage. To study the characteristic law of rock damage and cutting cavity formation under high in-situ stress in upward blind cutting blasting using the smooth hydrodynamic method (SPH method), and the results were compared with the field cavity scanning results to verify the accuracy of the numerical simulation, and the inverse extrapolation of the rock clamping performance in the test area was performed based on the field test results to investigate the influence law of rock clamping production.
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