Optimization of Charge Structure of Peripheral
Blasting Holes Based&nbsp;on
Shaped Energy Water Pressure Smooth Blasting Technology

SONG Pengwei; YANG Xin′an; LI Huai; SUN Weixing

doi:10.3973/j.issn.2096-4498.2022.01.013

2022 , Vol. 42 >Issue 1: 103 - 112

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.01.013

Optimization of Charge Structure of Peripheral Blasting Holes Based on Shaped Energy Water Pressure Smooth Blasting Technology

SONG Pengwei ,
YANG Xin′an ,
LI Huai ,
SUN Weixing

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(1. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China; 2. College of Transportation Engineering, Tongji University, Shanghai 201804, China; 3. CCCC Third Harbor Engineering Co., Ltd., Shanghai 200030, China)

Online published: 2022-01-28

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Abstract

To obtain the optimal charge structure of the peripheral blasting holes of the shaped energy water pressure smooth blasting technology, a numerical simulation test based on LS-DYNA and field test are used to analyze the dynamic response characteristics of the surrounding rock and the effect of the smooth blasting. The results can optimize the charge structure based on the shaped energy water pressure smooth blasting mechanism. The numerical simulation tests show that when charge structure #4 is used, the maximum effective stress and fracture area (over 50 cm) are along the energyconcentrated direction. Furthermore, the energy concentration effect is good, as is the effect of blasting vibration under control. The field tests show that when the structure of group 4 charges the peripheral blasting holes, the eyemark rate is over 95%, and the over and under-excavation values are the smallest. Furthermore, the blasting hole utilization rate is the highest, and the blasting effect is the smoothest. Under the same geological conditions, the comprehensive analysis results show that charge structure #4, which is reinforced dynamite at the bottom of 30 cm + energy concentrated tube of 100 cm × 3 (sectioned charge) + water bag of 30 cm + air space of 40 cm + water sandbag of 30 cm, is the best of the six test schemes.

Key words： tunnel; shaped energy-water pressure smooth blasting technology; peripheral blasting holes; charge structure; dynamic response characteristics of surrounding rock; smooth blasting

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SONG Pengwei , YANG Xin′an , LI Huai , SUN Weixing .

Optimization of Charge Structure of Peripheral Blasting Holes Based on Shaped Energy Water Pressure Smooth Blasting Technology

[J]. Tunnel Construction, 2022 , 42(1) : 103 -112 . DOI: 10.3973/j.issn.2096-4498.2022.01.013

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