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Drilling and blasting is widely used in mining and construction industries, and ground vibration is one of the detrimental effects caused by blasting. To determine the fragmentation of rocks and to ensure the safety of ambient urban areas and residents, it is necessary to determine the parameters that have a reasonable influence on blast-induced vibration. This review firstly presents the ...
Jun 30, 2024 · Therefore, in blasting construction operations, the blasting vibration duration prediction formulae derived from this paper can be used to quantitatively calculate the blasting vibration time domain, frequency domain expression, and the power spectral density of blasting vibration regardless of whether it is a single-stage or multi-stage blasting. This avoids the dominant frequency of the ...
Sep 1, 2024 · Blasting is a common technique used for hard rock fragmentation in resource extraction and tunnel excavation [1], [2], [3]. In contour blasting, a radially decoupled charge structure is often employed to reduce the damage to the surrounding rock [4], [5], [6]. However, owing to the inclined or horizontal orientation of the boreholes, the ...
Abrasive blasting is a loose abrasive machining process. The abrasives stream (also called media) is propelled with compressed air or the centrifugal force (induced by a spinning wheel) against the workpiece surface at high speed. Sandblasting and shotblasting are two common variants of abrasive blasting.
4 days ago · Several mines are gradually moving towards deep or ultra-deep mining due to the growing demand for mineral resources and the continuing depletion of shallow resources. 1, 2 At present, the most common technique for mining hard rock is still drilling and blasting. 3, 4, 5 Therefore, the deep mine rock mass is in a coupling condition of high static stress and dynamic disturbance, 1, 2, 3, 6 ...
Sep 1, 2023 · The blasting efficiency of the traditional wedge-shaped cut represented by DCSD-is only 61.75%, indicating that the continuous charge is not suitable for the deep hole cut blasting. The cutting efficiency is increased by 21.89% after the dispersed charge is used for the first stage cut hole. Once the dispersion charge is applied to the central ...
Aug 1, 2024 · Bench blasting is commonly employed in hard rock excavations in open-pit mines. 1, 2, 3 The effectiveness of bench blasting is influenced by different factors including the rock mass properties, blasting parameters, and explosive characteristics. 4, 5 In general, the blasting effect is improved by modifying the explosive properties and blasting parameters to align with the lithological conditions.
Apr 1, 2024 · Abstract. When the presplit blasting is applied to rock excavation at a deep level, crack-forming difficulties are encountered due to the characteristics of high geo-stress. In this study, the influences of in-situ stress on rock cracking in presplitting are studied using theoretical and numerical methods. The transmission and superimposition ...
Sep 1, 2017 · The rock-breaking mechanism and effect of confined blasting were analysed by blasting and impact dynamic mechanics, fluid dynamic mechanics, fracture mechanics as well as blasting experiment. The results showed that the fracturing of surrounding rock in confined blasting condition is the result of coaction of rock pre-cracking by shock wave and stress wave and the continuing expanding crack ...
Jan 1, 2024 · The overall blasting process of the palm face is shown in Fig. 14 as a graph of rock damage at various times in the palm face. The overall blasting process of the palm face is shown in Fig. 14 as a graph of rock damage at various times in the palm face. Firstly, at 0 μs, the center of the cut holes all began to detonate. With the damage ...
