Parametric characteristics of coal rock constitutive model under blasting load

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (5) : 263-277.

SHOCK AND EXPLOSION

Parametric characteristics of coal rock constitutive model under blasting load

ZHANG Xin1,2, LIU Zegong*1,2, CHANG Shuai2, CHEN Xiangsheng2, XUE Yonglin2 ZHU Jialiang2, SONG Xin2

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Abstract

In order to investigate the performance of Riedel-Hiermaier-Thoma（RHT） and Holomquist-Johnson-Cook（HJC） constitutive models in the numerical simulation of blasting in deep coal and rock bodies, the parameters of RHT and HJC constitutive models were calibrated based on the deep coal in Huaibei mining area; then the validity of the calibrated parameters was verified through the indoor tests and numerical simulations of single-hole blasting, and the composite failure criterion of maximal tensile stress and maximal shear stress was added to improve the HJC model. Finally, the numerical simulation of single-hole blasting under different ground stresses is carried out based on the two constitutive models to explore the applicability of the two constitutive models in simulating the range of damage zones and rupture patterns. The numerical simulation results of single-hole blasting show that both the RHT model and the improved HJC model are able to describe the formation of the crushed zone and crack evolution under no ground stress loading condition; the numerical simulation results of the RHT and HJC models under different ground stress loading conditions show that the ground stress has a restraining effect on the crack expansion, and the quantitative indexes of the expansion range of the crack zone show that the RHT model is closer to the theoretical value than the HJC model. The RHT model is closer to the theoretical calculation value than the HJC model. According to the results of the study, the RHT model and the improved HJC constitutive model are both suitable for the numerical simulation of the blasting problem in the absence of ground stress, and the RHT constitutive model should be the first choice for the blasting in the high ground stress condition.

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coal / blasting / constitutive model / crack propagation / fracture zone

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ZHANG Xin1, 2, LIU Zegong1, 2, CHANG Shuai2, CHEN Xiangsheng2, XUE Yonglin2 ZHU Jialiang2, SONG Xin2. Parametric characteristics of coal rock constitutive model under blasting load[J]. Journal of Vibration and Shock, 2025, 44(5): 263-277

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