Study on influence of initiation sequence on fragmentation of step rock and blasting vibration

doi:10.16265/j.cnki.issn1003-3033.2024.02.0319

Abstract

Abstract:

In order to explore the influence of initiation sequence on the crushing effect of open steps and the surrounding environment, the LS-DYNA simulation software was used to calculate the step blasting model under different initiation sequences. First, the physical and mechanical characteristics of the model under different initiation orders were analyzed. Then, the field test was conducted to verify the simulation results and study the influence of the initiation sequence on the blasting vibration strength and rock crushing degree. The results show that the stacking effect, which changes the stress wave, shows the breaking effect and blasting vibration strength. The hole-by-hole blasting technology can effectively reduce the blasting vibration so as to reduce the adverse effects on the surrounding environment, but the rock-crushing effect is not ideal; the rock passing rate is 81.52%. Compared with the hole-by-hole blasting, the passing rate of wave sequential blasting gravel is increased by 11.68%, and the amount of single-hole collapse is increased by 16.8% when the hole net parameter is increased to 3 m×7 m, which effectively reduces the explosive consumption and reduces the comprehensive cost. However, it produces a large blasting vibration strength, which needs to pay attention to the impact on the surrounding environment.

Key words: detonation sequence, bench blasting, fragmentation size, blasting vibration, numerical simulation

CLC Number:

X936

DUAN Jichao, ZONG Qi, WANG Haibo, WANG Hao. Study on influence of initiation sequence on fragmentation of step rock and blasting vibration[J]. China Safety Science Journal, 2024, 34(2): 192-199.

Figures/Tables 16

Tab.1

Sandstone HJC parameters

参数	取值	参数	取值	参数	取值	参数	取值
密度ρ₀/(kg·m^-3)	2 688	抗拉强度T/MPa	12.2	压力常数K₁/GPa	81	抗压强度f_c/MPa	157
特征化黏聚强度参数A	0.32	弹性极限压力P_c/MPa	51.33	压力常数K₂/GPa	-91	损伤常数D₁	0.041
压力强化参数B	1.76	弹性极限体积应变μ_c	2.76	压力常数K₃/GPa	89	损伤常数D₂	1.0
应变率敏感系数C	0.001 86	静水压力P_l/GPa	0.012	最小断裂应变ε_fmin/s^-1	0.01	剪切模量G/GPa	26.54
特征化最大强度 $S m a x$	7.0	塑性变形μ_l	0.012	压力硬化系数N	0.79	参考应变率 $ε ˙ 0$ /s^-1	1.0

Tab.1

Fig.1

Tab.2

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Tab.3

Fig.10

Fig.11

Tab.4

Tab.5

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起爆方式	测点	测点位移/m	径向		切向		垂向
起爆方式	测点	测点位移/m	最大振速/ (cm·s^-1)	主频/ Hz	最大振速/ (cm·s^-1)	主频/ Hz	最大振速/ (cm·s^-1)	主频/ Hz
逐孔起爆	1	30	-25.796	17.700	-13.888	35.706	20.134	18.005
	2	60	-6.688	18.616	9.926	31.316	-10.72	37.537
	3	90	4.174	36.926	-3.232	37.537	4.334	37.231
奇偶式顺序起爆	1	30	-33.581	18.005	-15.233	19.836	-27.692	17.700
	2	60	-11.895	18.616	-13.460	18.92	-10.269	20.142
	3	90	-7.311	40.283	11.410	36.926	-6.354	19.531
波浪式顺序起爆	1	30	-35.708	49.4	30.475	18.005	-25.179	19.226
	2	60	-33.918	59.814	7.722	19.531	-15.416	19.836
	3	90	13.551	18.616	-10.365	21.362	12.408	18.616

起爆方式	孔网参数/m×m	占整体爆堆比例/%					单孔爆落矿量/t
起爆方式	孔网参数/m×m	≤ 250 mm	(250,300] mm	(300,350] mm	(350,400] mm	≥ 400 mm	单孔爆落矿量/t
逐孔起爆	3×6	81.52	3.94	7.51	2.26	4.76	572.4
波浪式顺序起爆		93.21	6.79	—	—	—
奇偶式顺序起爆		87.20	—	1.74	11.06	—

起爆方式	孔网参数/m×m	占整体爆堆比例/%					单孔爆落矿量/t
起爆方式	孔网参数/m×m	≤ 250 mm	(250,300] mm	(300,350] mm	(350,400] mm	≥ 400 mm	单孔爆落矿量/t
波浪式顺序起爆	3×7	80.33	5.33	1.74	10.9	1.70	667.8
奇偶式顺序起爆	3×7	73.6	8.56	2.22	5.66	9.96	667.8

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