Analysis of explosive stress wave localized effects on edge of rock rod

doi:10.16265/j.cnki.issn1003-3033.2026.06.0435

Abstract

Abstract:

To determine the range of influence of local effects on the near-field stress wave generated by an explosion in a rock rod, an innovatively designed one-dimensional experimental apparatus and system for studying explosive stress waves were employed. By applying explosive loads with different action scales to the end face of a long rock rod specimen, the differences in waveform characteristics and propagation features of the explosive stress wave at different radial positions on the rod surface were analyzed. The stress-wave characteristics at each position were also statistically analyzed. The propagation process of the explosive stress wave inside the rock rod under different action scales was investigated using the Livermore Software Technology Corporation's Dynamic Analyzer(LS-DYNA) numerical simulation. The variation in peak stress and waveform characteristics of the stress wave distributed radially inside the rock rod were analyzed, and the influence range of the local effect. The results show that, under different action scales, the characteristics of the explosive stress wave near the explosion end of the gray sandstone rock rod differ significantly. As the axial propagation distance increases, the stress wave gradually becomes uniform at a distance of 4 times the cross-sectional radius of the rock, with correlation coefficients calculated using Spearman correlation analysis all greater than 0.95. Beyond this point, the influence of the local effect can be neglected. Analysis of the finite element simulation results show that the range affected by the local effect in the radial direction inside the rock is within 7 times the cross-sectional radius of the rock.

Key words: rock rod, explosion, stress wave, localized effect, influence range, explosive load

CLC Number:

X932爆炸安全与防火、防爆

Yu Haoran, Chen Jun, Su Hong, Yang Haibin, Zhang Zijian. Analysis of explosive stress wave localized effects on edge of rock rod[J]. China Safety Science Journal, 2026, 36(6): 134-142.

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参数	密度/(g/cm³)	单轴抗压强度/MPa	剪切模量/ GPa	黏度常数	压力强化系数	压力参数2
数值	2.34	77.5×10^-5	0.125	0.91	1.60	-1.71
参数	累积塑性应变	最大强度/ MPa	压碎(溃) 压力/MPa	压碎体积应变	压实点压力/ GPa	压实点体积应变
数值	1×10^-11	0.01	25.8×10^-5	0. 001 5	0.012	0. 012 5
参数	压力硬化指数	最大拉伸静水压力/ MPa	应变速率临界值/ s^-1	压力参数3	失效类型	应变速率系数
数值	0.81	6.56×10^-5	1.0×10^-11	2.08	0	0.008
参数	损伤参数1	损伤参数2	压力参数1
数值	0.03	1	0.85