A Rock Fracturing Method Using High‐Pressure Gas Expansion: Case Study on Its Application in Hangzhou‐Lin’an Intercity Railway

Liu, Dunwen; Tang, Yu; Cai, Caiwu; Jian, Yinghua

doi:10.1155/2021/6654471

Cited by 4 publications

(1 citation statement)

References 19 publications

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“…It is well-known that new blasting methods such as supercritical carbon dioxide, soundless chemical demolition agents, and high-pressure gas expansion have the advantages of safety and environmental protection [20,21]. These new blasting methods can effectively control the overbreak and underbreak problems of tunnel blasting.…”

Section: Introductionmentioning

confidence: 99%

Multifractal Characteristics of Smooth Blasting Overbreak in Extra-Long Hard Rock Tunnel

Zhang,

Liu,

Tang

et al. 2023

Fractal Fract

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With the development of infrastructure construction in mountainous areas, the number of new extra-long tunnels is increasing. However, these tunnels often face the challenge of complex and variable surrounding rock grades, resulting in a large number of overbreak and underbreak due to the untimely adjustment of smooth blasting parameters. This study focuses on the optimization of the peripheral hole charging structure and blasting parameters for extra-long hard rock tunnels, aiming to improve the effectiveness of smooth blasting technology. The results of this study demonstrate a significant improvement in the effect of smooth blasting after implementing bidirectional polymerization blasting in the tunnel. A comparison between the bidirectional shaped charge and spaced decoupled charge blasting reveals that the former yields better results. To obtain accurate data on the tunnel section profile during excavation, a laser cross-section meter is used for measurement. Furthermore, this study quantitatively compares the optimization effect of smooth blasting parameters. The multifractal characteristics of the tunnel profile overbreak point sequences are analyzed under different smooth blasting schemes using the multifractal detrended fluctuation analysis (MF-DFA) method. It is found that both the spaced decoupled charge and the bidirectional shaped charge blasting exhibit multifractal features in the overbreak measurement point sequences. The calculation results of the multifractal features of the tunnel profile under different smooth blasting plans are in line with the actual situation.

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Section: Introductionmentioning

confidence: 99%

Multifractal Characteristics of Smooth Blasting Overbreak in Extra-Long Hard Rock Tunnel

Zhang,

Liu,

Tang

et al. 2023

Fractal Fract

Self Cite

View full text Add to dashboard Cite

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Application of High-Pressure Gas Expansion Rock-Cracking Technology in Hard Rock Tunnel near Historic Sites

et al. 2023

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In order to study the applicability of high-pressure gas expansion rock-cracking technology in hard rock tunnel near historic sites, theoretical analysis, field tests as well as vibration monitoring are conducted to obtain suitable rock mass cracking parameters for tunnel excavation. The results show that the ideal effect of rock mass cracking can be achieved with the cutting mode of “central vertical empty hole + double wedge cutting hole” and the auxiliary hole network parameter of “0.8 m × 0.7 m”. The measured vibration velocity is less than 0.1 cm/s at the monitoring point 60 m away from the tunnel face in the field test, which meets the vibration control requirements of the historic sites in the process of tunnel excavation. The research results show that as long as there is a high quality of hole plugging and no punching, the high-pressure gas expansion rock-cracking technology has the advantages of little vibration, low noise and less flying rocks, which provides a technical reference for the excavation of hard rock tunnels near ancient buildings and historic sites.

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The Vibration Response to the High-Pressure Gas Expansion Method: A Case Study of a Hard Rock Tunnel in China

Peng,

Sheng,

et al. 2024

Applied Sciences

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The vibration of rock breaking in tunnel excavation may cause serious damage to nearby buildings if it is not controlled properly. With reference to a hard rock tunnel in China, the vibration response to the high-pressure gas expansion method (HPGEM), an emerging rock-breaking approach, was investigated with field tests, theoretical derivations, and numerical simulations, then comparisons with the traditional dynamite blast were performed. Firstly, the vibration velocity prediction formulas of the two methods were fitted based on the field tests. Subsequently, the accuracy of the formula was verified by numerical simulation, and the vibration attenuation law of the HPGEM was explored. Comparisons were made between the blast and HPGEM, particularly the differences in peak particle velocity (PPV) for different agent qualities, distance from the blasting center, and engineering conditions. Furthermore, this study also analyzed the relationship between the agent qualities and the rock-breaking volume under different cases, finding that the HPGEM has slight vibration and good rock-breaking effect. The HPGEM is thus fully capable of replacing dynamite blasting to carry out rock-breaking operations in certain special areas.

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A Rock Fracturing Method Using High‐Pressure Gas Expansion: Case Study on Its Application in Hangzhou‐Lin’an Intercity Railway

Cited by 4 publications

References 19 publications

Multifractal Characteristics of Smooth Blasting Overbreak in Extra-Long Hard Rock Tunnel

Multifractal Characteristics of Smooth Blasting Overbreak in Extra-Long Hard Rock Tunnel

Application of High-Pressure Gas Expansion Rock-Cracking Technology in Hard Rock Tunnel near Historic Sites

The Vibration Response to the High-Pressure Gas Expansion Method: A Case Study of a Hard Rock Tunnel in China

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