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oitted to Ecellence in Mining Safety Last Modified: Page: JAN 2013 2 of 21 MODULE 12 (C ONT.)Surface Blasting Safety Procedures Blasting Materials Surface delays, detonators or blasting caps, boosters, safety fuse, down-line and other explosives used for blasting.
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School of Resources & Safety Engineering, Wuhan Institute of Technology, Hubei, Wuhan 430074, ... the guttering technology for improving the deep-hole blasting …
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School of Resources & Safety Engineering, Wuhan Institute of Technology, Hubei, Wuhan 430074, ... the guttering technology for improving the deep-hole blasting of phosphate rock was optimized. 2. Analysis of Empty Hole Effect ... r is the distance from a point in the rock to the center of the blasthole, m; ...
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Longhole stoping is a productive exploitation technique for underground metalliferous deposits. The method consists of deep-hole blasting with increased explosive charges to excavate larger volume of ore from a single blast. However, large scale blasting produces hazards in terms of blast-induced vibration. The underground …
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Review on Research of Misfire in Ope n Deep-Hole Blasting, Eng. Blasting. vol. 19, no. 5, pp. 49-53. Sheridan J. R. (1976). Analysis Of Noncoal Mine Atmospheres: T oxic Fumes F rom Explosives ...
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The influence radius of single-hole blasting was 3.1 m, the hole diameter of double-hole blasting was 113 mm, the hole spacing was 5.5 m, and the delayed blasting time was 25 ms.
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4.0 The entire operations of conduct of safe deep-hole drilling and blasting operations in the mine including transport of the explosive to the site of its use, shall be …
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Schematic Diagram of Step Elements for Open-Air Deep Hole Blasting Note: In the figure, H is the height of the step; W1 is the chassis resistance line of the …
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For deep hole blasting, the original oblique hole cutting method necessitates the explosive to be concentrated at the bottom of the blast hole, making the distribution of the explosive energy unreasonable. ... The distance between the center hole and the face ZY is 250 mm, the length of the charge is 1.21875 m, and the length of the …
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A 2D FEM model is prepared in Rocscience based on the geotechnical report just beside the blasting holes to cross-check the effect of blast-induced vibration on the surrounding slope of the rock excavation inside the station box. Rock properties for the present model are in Table 6.
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Deep-hole blasting and chamber blasting technology are widely used in mining and large-scale earth-rock excavation or ... It is observed that when the distance between millisecond blasting holes is equal to greater than 5 m, the detection signals between holes will not interfere with each other. ... and also provides a basis for the …
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In rock blasting for mining production, stress waves play a major role in rock fracturing, along with explosive gases. Better energy distribution improves fragmentation and safety, lowers production costs, increases productivity, and controls ore losses and dilution. Blast outcomes vary significantly depending on the choice of the explosive and …
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The sublevel stoping mining method with delayed backfill has been widely used in various mines because it ensures stope production capacity, improves economic benefits and safety, and reduces the risk of tailings ponds [1,2,3,4].Parallel hole cut blasting is a key technology of the sublevel stoping mining method with delayed backfill …
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The grand-scale suspended roofs overlying the goaf are commonly developed under thick-hard rock strata (THRS) during the mining process of the deep coal seam. As a result, strong mine seismicities triggered constantly by deep mining have impeded severely the safety and efficient operation of deep mines. The working-face …
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It has been proved that reasonable blasting parameters are core to ensuring the quality of medium-deep hole blasting, and the design and optimization of blasting parameters are of great significance to mining [3,4].In recent years, a lot of work has been carried out to determine the parameters of blasting and the impact of …
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meability coal seam, deep-hole presplit blasting remains an effective approach for improving the gas drainage efficiency of low-permeability coal seams. Many scholars have studied the deep-hole presplit blast-ing in coal seam. Liu et al. [18] found that the effect of dril-ling blasting with borehole cross the seam was better than that down ...
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The results provide theoretical and practical guidance for predicting safety in similar deep tunnels during blasting. ... is smaller than that in cutting holes. When the distance from blasting ...
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PDF | On Sep 1, 2021, Hao Cheng published Applied Research of Deep-hole Presplitting Blasting Technology in Coal | Find, read and cite all the research you need on ResearchGate
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Determination of blasting holes spacing: The determination of the blasting fracturing range is mainly based on the radius of the crushing-fracturing zone excited by the blasting shock wave and the quasi-static secondary driving crack radius of the explosive gas. Therefore, it is necessary to determine the shock wave stress near the blasting hole.
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helps to ensure the safety of the concerned structures as well as ... sensitivity analysis that distance from the site of blast, number of ... Anurag Agrawal . Blast Design for …
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The principle of blasting hole arrangement in igneous rock intrusion area is determined by relevant numerical simulation analysis results: the optimal distance between blasting hole and igneous ...
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blasting operations with a short distance [2]. ... Under instantaneous detonation of deep hole blasting, blasting ... The use of low-explosion industrial explosive and uncoupled segmented charge can reduce the impact of blasting on slope safety. Due to the existence of a large number of joints and fissures in the
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The aperture of the open-pit deep hole blasting is largely related to the type of drilling rig. In the blasting area considered in this study, the aperture was 90 mm. ... The chassis resistance line was calculated considering the safety conditions of drilling operations as follows: W 1 ... The considered unit was located at a certain distance ...
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Deep-hole blasting and chamber blasting technology are widely used in mining and large-scale earth-rock excavation or ... It is observed that when the distance …
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This paper proposes the vibration reduction measures for the boulder deep-hole blasting to meet the construction safety. To achieve this purpose, the field test was applied to investigate the vibration response of adjacent building under five blasting areas. ... obtained the maximum amount of cutting holes and safe distance of blasting ...
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DOI: 10.1016/J.TUST.2021.103866 Corpus ID: 233582894; A study on hollow effect and safety design of deep crossing caverns under blasting vibration @article{Xu2021ASO, title={A study on hollow effect and safety design of deep crossing caverns under blasting vibration}, author={Mingnan Xu and Xinping Li and Tingting Liu and Yi Luo and Huang …
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The No. 2 rock emulsion explosive is used for the on-site blasting, the density of the explosive is 1.24 g/cm 3, the detonation speed is D = 4200 m/s, the …
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The suggested safety distance in deep mining. ... (about 16 times the radius of the blast hole); the designed safety distance is not enough to reduce the influenced area; therefore, the safety distance in −780 m and −1020 m are suggested to be 1.2 m and 0.8 m, respectively, that can effectively reduce influenced area of hoop …
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Deep hole blasting diameter was 40 mm; therefore, designed charge diameter was 32 mm and charge length was 1 m. ... A total of 6 pairs of cutting holes were arranged. The distance between the ...
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Once the blast holes are triggered, the blast wave expands in a cylindrical shape, exerting pressure on the water as it travels . This wave then forcefully hits the nearby rock's surface through the thin layer of water, causing the disintegration of the rocks' intergranular structure at some distance from the blast hole [7, 21, 22].
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