Research on Deep-Hole Cutting Blasting Efficiency in Blind Shafting with High In-Situ Stress Environment Using the Method of SPH

Bo Sun, Zhiyu Zhang, Jiale Meng, Yonghui Huang, Hongchao Li and Jun Wang
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Bo Sun: Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Zhiyu Zhang: Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Jiale Meng: Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Yonghui Huang: Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
Hongchao Li: City Collage, Kunming University of Science and Technology, Kunming 650051, China
Jun Wang: Yuxi Dahongshan Mining Co. Ltd., Yuxi 650302, China

Mathematics, 2021, vol. 9, issue 24, 1-16

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 K r at the corresponding depth. The relationship between the cavity area S c and the free surface distance D f 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 S c - D f curve, and provides important reference value for the design of one-time completion blasting of upward blind shaft.

Keywords: numerical methods; deep rock mechanics; rock damage judgment criteria; SPH; blind shaft cutting blasting (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
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