Variation Law of Energy Consumption of Engineering Blasting Cavity Expansion with Decoupling Coefficient

doi:10.12382/bgxb.2024.0202

Abstract

Abstract:

In order to optimize the distribution of explosive energy in the smooth blasting of holes around underground projects, improve the hole mark rate and ensure the smooth blasting effect, a calculation method for the energy consumption of cavity expansion is established based on the theory of rock breaking and fracture mechanics. The blasting test is carried out with the cast-in-situ plain concrete model, and the law of variation of blasting size, cavity volume and energy consumption with the decoupling coefficient K is obtained. The research results show that the diameter of cavity expansion is 3.43 cm in the process of increasing from 1.25 to 3.375, the average cavity length is 12.7cm, and the cavity volume ranges from 52.98cm³ to 155.56cm³. The expanding-cavity energy consumption is between 0.58kJ and 1.70kJ, and its proportion in the total explosive energy is between 2.9% and 8.5%, and the volume and energy consumption of cavity expansion decrease with the increase of K. K has the most obvious effect on reducing the energy consumption of cavity expansion when it reaches 3.0~3.5, and then tends to be stable; With the increase of K, the degree of pulverization of the rock on the hole wall by explosive energy is reduced so that the volume of and energy consumption of the cavity are reduced. The results of model test and theoretical analysis are mutually verified. It is indicated that a large decoupling coefficient can be selected to reduce the energy consumption ofcavity expansion in a certain range.

Key words: engineering blasting, expansion of cavity, energy consumption, decoupling coefficient, model test

CLC Number:

O383

HUANG Yonghui, QIN Lixuan, XU Rui, ZHANG Zhiyu. Variation Law of Energy Consumption of Engineering Blasting Cavity Expansion with Decoupling Coefficient[J]. Acta Armamentarii, 2025, 46(3): 240202-.

Figures/Tables 15

Fig. 1 Schematic diagram of cavity expansion process

Fig. 2 Schematic diagram of shock wave micro-body

Fig.3 Schematic diagram of explosion gas micro-body

Table 1 Borehole parameter

模型编号	炮孔直径/cm	装药直径/cm	不耦合系数
A	1.0	0.8	1.250
B	1.2		1.500
C	1.6		2.000
D	2.0		2.500
E	2.4		3.000
F	2.7		3.375

Fig. 4 Physical model

Fig.5 Hole charging structure

Table 2 Model physical and mechanical parameters

单轴抗压强度σ_c/MPa	纵波波速/ (m·s^-1)	密度 ρ_r/(kg·m^-3)	泊松比μ	弹性模量/ GPa
8.38	2326	1850	0.24	10.02

Fig.6 Test of basic mechanical parameters of specimens

Fig.7 Cavity expansion measurement

Table 3 Cavity expansion parameter

不耦合系数K	炮孔半径 r₀/cm	装药长度 l₀/cm	扩腔长度 l_c/cm	扩腔直径 d_c/cm	扩腔体积 V_c/cm³
1.250	0.50	10	14.64	3.77	155.56
1.500	0.60	10	11.98	3.56	107.93
2.000	0.80	10	11.39	3.53	91.37
2.500	1.00	10	13.91	3.05	70.21
3.000	1.20	10	12.93	3.11	52.98
3.375	1.35	10	11.32	3.54	54.16

Fig.8 Relationship between diameter of cavity expansion and decoupling coefficient

Fig.9 Relationship between length of cavity expansion and decoupling coefficient

Fig.10 Relationship between volume of cavity expansion and decoupling coefficient

Table 4 Energy consumption and proportion of cavity expansion

不耦合系数 K	扩腔体积 V_c/cm³	动态抗压强度σ/MPa	扩腔耗能 E_v/kJ	扩腔能耗占比η_v/%
1.250	155.56	10.89	1.70	8.50
1.500	107.93	10.89	1.18	5.90
2.000	91.37	10.89	1.00	5.00
2.500	70.21	10.89	0.77	3.85
3.000	52.98	10.89	0.58	2.90
3.375	54.16	10.89	0.59	2.95

Fig.11 Relationship between the energy consumption and proportion of cavity expansion and the decoupling coefficient

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