Precise Delay Hole-by-hole Detonation Technology for Small Section Roadway

doi:10.12382/bgxb.2024.0418

Abstract

Abstract:

The accurate delay performance of digital electronic detonator provides the conditions for selecting a method of hole-by-hole detonation in small section roadway,but the selection of delay time between holes has always been a difficulty.Based on the theory of rock breaking and millisecond blasting,an accurate delay calculation method of hole-by-hole detonation in roadway is constructed.The three-dimensional numerical model of full section is established by using the generalized discrete element method (GDEM) software.Based on the calculated delay time,the hole-by-hole detonation is numerically simulated to analyze the damage and effective stress of roadway section.The results show that,within 50ms,the cutting holes are all detonated,the delay time between the holes is short,the superposition of stress waves is obvious,and an obvious crushing zone is generated.After 50ms,the auxiliary holes and the surrounding holes are detonated one by one,the free surface is continuously expanded,the clamping force is reduced,the delay time between the holes is increased,the superposition of stress waves is weakened,the rock is broken evenly,and the explosion energy is more fully utilized.The hole-by-hole blasting test results of underground mine roadway are remarkable,there are no obvious chunks after blasting,the average block size is 19 cm,and the average hole utilization rate is 93.3%.The precise delay hole-by-hole blasting method effectively improves the tunneling efficiency of small-section roadway and controls the blasting disturbance.

Key words: small section roadway, hole-by-hole detonation, free area, accurate delay, generalized discrete element method

WANG Mian, WANG Jianguo, MA Jun, LI Jinhua, LEI Lugang, ZHANG Wei. Precise Delay Hole-by-hole Detonation Technology for Small Section Roadway[J]. Acta Armamentarii, 2025, 46(3): 240418-.

Figures/Tables 23

References 23

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参数	孔号
参数	2	3	4	5	6	7	8	9
临空面积/m²	0.065	0.0699	0.1552	0.2347	0.3246	0.5084	0.6355	0.8107
最小抵抗线/m	0.13	0.21	0.13	0.21	0.33	0.29	0.29	0.33
参数	孔号
参数	10	11	12	13	14	15	16	17
临空面积/m²	1.0434	1.2584	1.4814	1.6357	2.0087	2.3989	2.7853	3.1603
最小抵抗线/m	0.40	0.40	0.34	0.52	0.52	0.54	0.54	0.52

参数	孔号
参数	2	3	4	5	6	7	8	9
临空面积/m²	0.065	0.0699	0.1552	0.2347	0.3246	0.5084	0.6355	0.8107
最小抵抗线/m	0.13	0.21	0.13	0.21	0.33	0.29	0.29	0.33
参数	孔号
参数	10	11	12	13	14	15	16	17
临空面积/m²	1.0434	1.2584	1.4814	1.6357	2.0087	2.3989	2.7853	3.1603
最小抵抗线/m	0.40	0.40	0.34	0.52	0.52	0.54	0.54	0.52

孔号	2	3	4	5	6	7	8	9
延时/ms	10(10)	15(25)	10(35)	15(50)	30(80)	27(107)	27(134)	30(164)
孔号	10	11	12	13	14	15	16	17
延时/ms	35(199)	35(234)	30(264)	45(309)	45(354)	45(399)	45(444)	45(489)

孔号	2	3	4	5	6	7	8	9
延时/ms	10(10)	15(25)	10(35)	15(50)	30(80)	27(107)	27(134)	30(164)
孔号	10	11	12	13	14	15	16	17
延时/ms	35(199)	35(234)	30(264)	45(309)	45(354)	45(399)	45(444)	45(489)

参数	数值	参数	数值
材料密度ρ/(kg·m^-3)	2700	无侧限抗压强度C_oms/ MPa	143
材料归一化的内聚强度A	0.25	压实状态体积模量1,K1/GPa	12
归一化的压力硬化系数B	1.8	压实状态体积模量2,K2/GPa	25
应变率系数C	0.00184	压实状态体积模量3,K3/GPa	42
压力硬化指数N	0.83	材料能够承受的最大静水拉应力T/MPa	6.82
归一化的最大强度S_max	5	材料剪切模量G/GPa	22.3
损伤计算系数D1	0.05	空洞完全坍塌(压实)时的压力p_lock/GPa	1.2
损伤计算指数D2	1	空洞完全坍塌(压实)时的体积应变U_lock	0.0159
最小破碎塑性应变E_min	0.01	空洞坍塌压力p_crush/GPa	24.5
弹性极限体积应变U_crush	0.00118