Experimental Study on Delay Time Optimization of Tunnel Cutting Holes and Caving Holes under Electronic Detonator Initiation Condition

LI Hongwei; WU Yanmeng; WU Lihui; YANG Saiqun; GUAN Yueqiang; HUANG Xinxu; ZHANG Wanlong

doi:10.11858/gywlxb.20220638

Volume 37 Issue 1

Feb 2023

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Chinese Journal of High Pressure Physics > 2023 > 37(1): 015301.

LI Hongwei, WU Yanmeng, WU Lihui, YANG Saiqun, GUAN Yueqiang, HUANG Xinxu, ZHANG Wanlong. Experimental Study on Delay Time Optimization of Tunnel Cutting Holes and Caving Holes under Electronic Detonator Initiation Condition[J]. Chinese Journal of High Pressure Physics, 2023, 37(1): 015301. doi: 10.11858/gywlxb.20220638

Citation:

LI Hongwei, WU Yanmeng, WU Lihui, YANG Saiqun, GUAN Yueqiang, HUANG Xinxu, ZHANG Wanlong. Experimental Study on Delay Time Optimization of Tunnel Cutting Holes and Caving Holes under Electronic Detonator Initiation Condition[J]. Chinese Journal of High Pressure Physics, 2023, 37(1): 015301. doi: 10.11858/gywlxb.20220638

Citation:

LI Hongwei, WU Yanmeng, WU Lihui, YANG Saiqun, GUAN Yueqiang, HUANG Xinxu, ZHANG Wanlong. Experimental Study on Delay Time Optimization of Tunnel Cutting Holes and Caving Holes under Electronic Detonator Initiation Condition[J]. Chinese Journal of High Pressure Physics, 2023, 37(1): 015301. doi: 10.11858/gywlxb.20220638

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Experimental Study on Delay Time Optimization of Tunnel Cutting Holes and Caving Holes under Electronic Detonator Initiation Condition

doi: 10.11858/gywlxb.20220638

1.
School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232000, Anhui, China
2.
Ma’anshan Jiangnan Chemical Co., Ltd., Ma'anshan 243000, Anhui, China
3.
Huainan Shuntai Chemical Industry Co., Ltd., Huainan 232000, Anhui, China

Received Date: 11 Aug 2022
Rev Recd Date: 15 Oct 2022

Available Online: 21 Feb 2023

Issue Publish Date: 05 Feb 2023

Abstract

Abstract

The initiation delay time seriously affects the efficiency of tunnel blasting excavation. It is of great significance to study the improvement of rock fragmentation effect and tunneling efficiency under the electronic detonator initiation condition via precise control blasting. The similarity model test of delay time between the cutting holes and the caving holes in tunnel blasting was conducted, and the rock fragmentation characteristics under different delay time were analyzed. The results show that it can be seen from the model test that the electronic detonator has obvious advantages in improving the blasting effect in tunnel blasting for its precise delay ability. In addition, the similarity relationship of the initiation delay time between the model and field tests was summarized. According to the field test, when the best delay time between the cutting holes and the caving holes is 15−25 ms, the utilization rate of the blast-holes is the highest. Guided by the similarity theory, the optimum delay time drawn from the model test is 8–24 ms, showing a good agreement with the field test. This paper is of reference for the selection of delay time between the cutting holes and the caving holes in tunnel blasting.
- tunnel blasting,
- electronic detonator,
- delay time,
- millisecond blasting

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References(22)

References

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Experimental Study on Delay Time Optimization of Tunnel Cutting Holes and Caving Holes under Electronic Detonator Initiation Condition

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Experimental Study on Delay Time Optimization of Tunnel Cutting Holes and Caving Holes under Electronic Detonator Initiation Condition

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