Study on the liquefaction characteristics of saturated sands by millisecond delay blasting

Chen, Yumin; Li, Changchun; Wang, Weiguo; Liu, Hanlong; Yao, Yao; Ni, Songtao; Sarajpoor, Saeed

doi:10.1016/j.soildyn.2022.107584

Cited by 3 publications

(2 citation statements)

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“…Additionally, the ultra depth value is affected by the properties and structure of the rock mass, exhibiting a certain degree of proportionality with the diameter of the blast hole, as shown in Equation (1).…”

Section: Blasting Plan and Parameter Designmentioning

confidence: 99%

“…Due to its relatively low cost and high efficiency [1,2], blasting technology is widely adopted in various engineering applications across a wide range of domains, such as mining, transport infrastructure construction, and building demolition [3][4][5]. In recent years, a large number of new blasting equipment has entered the blasting industry, among which the digital electronic detonator has been highly recognized by many researchers and users due to its simple operation, high delay accuracy, and detectable blasting network [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study on the Effect of Three-Hole Simultaneous Blasting Technology on Open-Pit Mine Bench Blasting

Zhang,

Li,

Wei

et al. 2024

Applied Sciences

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Blasting technology is widely applied in various engineering applications due to its cost-effectiveness and high efficiency, such as in mining, transport infrastructure construction, and building demolition. However, the occurrence of cracking in the rear row has always been a major problem that disrupts mining bench blasting. To address this issue, a three-hole simultaneous blasting technology is proposed in this study. Both numerical simulations and onsite blasting experimental testing were conducted. To aid this endeavor, the three-hole simultaneous blasting and the hole-by-hole blasting methods were adopted to comparatively analyze the severity of the damage caused to the original rock and the effect of rock fragmentation in the rear row. The obtained results highlighted that the outcome of the blast produced by the three-hole simultaneous blasting method is satisfactory, with fewer flying stones and concentrated blasting piles required. Additionally, the original rock in the rear row showed no obvious sign of tensile damage and had uniform fragmentation. It was also found that a block size of less than 60 cm accounts for 100%, while a block size of less than 50 cm accounts for 98.7% of the whole blocks, with no large blocks reported. Moreover, a penetrating horizontal crack occurred in the direction of the connection of the blast hole center when the three-hole simultaneous blasting method was adopted. This resulted in a smooth and flat rear part of the rocks at the interface. Compared to the hole-by-hole blasting method, the three-hole simultaneous blasting method improved the effective stress and displacement at each measurement point. At the measurement point directly at the front of the borehole, the maximum effective stress attained 67.9 GPa, and the maximum displacement reported was 31.9 cm. Overall, it was shown that the three-hole simultaneous blasting technology is applicable in similar applications of mine bench blasting, which is conducive to addressing the rear row original rock strain for onsite bench blasting.

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Section: Blasting Plan and Parameter Designmentioning

confidence: 99%