Blasting demolition of steel structure using linear cumulative cutting technology

Duan, Baoyan; Zhou, Yang; Zheng, Shaochen; Bao, Minghao; Wang, Liping; Dong, Jianghui

doi:10.1177/1687814017729089

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…16,30 Shaped charge blasting uses the explosive forming pellet to directionally accumulate explosive energy in order to improve blasting efficiency. 31 The explosive forming pellet gradually forms the shaped charge jet (TSCJ) under the effect of the detonation wave after the detonation initiates. Figure 2 illustrates the formation process of the shaped charge jet.…”

Section: Mechanism Of Shaped Charge Blastingmentioning

confidence: 99%

Numerical simulation of directional fracturing by shaped charge blasting

Meng

Chen

Bai

et al. 2020

Energy Science & Engineering

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Longwall mining has been widely applied in China in the recent decades. Safety hazards frequently happen at longwall mining working faces with hard roof conditions. This is one of the main challenges for underground mining, especially for most coal mines in Shanxi province in China. 1 Hard roofs have characteristics of high tensile strength and large thickness. They normally have poor caveability and few existing rock joints. 2 With the working face advancing, the hanging roof area increases gradually, resulting in the hanging roof of this opening room reaching area up to 8000 m 2 . The roof material is strong but brittle that causes it to cave suddenly once ground pressure reaches a threshold value. And this sudden failure causes the pressure to greatly exceed the capacity of the hydraulic roof supports. The sudden caving can cause spall of coal bodies,

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Section: Mechanism Of Shaped Charge Blastingmentioning

confidence: 99%

Numerical simulation of directional fracturing by shaped charge blasting

Meng

Chen

Bai

et al. 2020

Energy Science & Engineering

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“…By comparing the characteristics of the ring-and linear-shaped charges with the same profile structure, the distribution characteristics of the ring-shaped charge jet parameters were analysed. Duan [7] used numerical simulations and experimental research methods based on linear cumulative cutting theory to analyse jet formation, target penetration, and the entire cutting process in shaped-charge blasting, and optimised the parameters of the cutting tool. Satisfactory cutting results were obtained from the experiments.…”

Section: Introductionmentioning

confidence: 99%

Controlled shaped-charge blasting technology for deep underground tunnel engineering

2023

JCE

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With the rapid development of the economy and society, the demand for mineral resources and energy has increased rapidly. However, it is difficult to improve the efficiency of blasting construction and control the stability of the surrounding rock in deep underground engineering. In this study, the deep underground tunnel of the Tianchi pumped-storage hydropower station in China was considered as the engineering background. Based on the stress redistribution state of the surrounding rock after blasting excavation, the crack propagation effect and dynamic response of the surrounding rock under different controlled blasting methods were studied through theoretical analyses, numerical simulations and in situ tests. The mechanism of directional crack formation was analysed by considering the influence of hole spacing and in situ stress. It was shown that the initial ground stress was conducive to the propagation of the blasting crack in the contour hole of smooth blasting towards the direction line of the blast hole. The test results showed that using controlled shaped-charge blasting methods in the blasting excavation of underground tunnels can improve the utilisation rate of explosives, reduce blasting vibration and achieve a significant effect on directional crack formation. The research results have important engineering significance as they can lead to improvements in the blasting technique, a contour-forming effect of the blasting excavation and control of the stability of the surrounding rock.

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“…LSC is extensively applied to aerospace and military fields. In civilian blasting engineering, LSC is used in bridge demolition [13], destruction of waste ammunition [14], and mining [15]. A stress gradient is formed in the rock during linear jet penetration, exhibiting dynamic crack propagation.…”

Section: Introductionmentioning

confidence: 99%

Rock Dynamic Fracture Characteristics by Mini‐Linear Shaped Charge Jet Penetration: A Case Study

Zhenyang

Liu

et al. 2022

Advances in Civil Engineering

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An insignificant number of studies have focused on employing penetration using mini-linear shaped charge jets for directionally controlled splitting of massive rocks. In this study, we adopt a numerical calculation method to simulate the penetration and formation of the main splitting surface of a concrete specimen, considering a wedge angle of 45° in both processes. The surface on the principal axial plane is found to split first due to linear jet penetration. In the case of single primary-plane splitting, cracks appear at both ends of the long axis of the penetration crack and the splitting surface extends diagonally from the center of the penetration. A transverse crack separates the splitting surface and the radial-fracture surface, and the degree of fracture decreases along the direction of the height of the specimen. Finally, a realistic physical model demonstrating penetration using a mini-linearshaped charge jet is established. It is a rapid and safe blasting technology to handle hazardous massive rocks during emergency rescuing or mining.

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Blasting demolition of steel structure using linear cumulative cutting technology

Cited by 6 publications

References 13 publications

Numerical simulation of directional fracturing by shaped charge blasting

Numerical simulation of directional fracturing by shaped charge blasting

Controlled shaped-charge blasting technology for deep underground tunnel engineering

Rock Dynamic Fracture Characteristics by Mini‐Linear Shaped Charge Jet Penetration: A Case Study

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