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An example of the application of deep-hole springing blasting technology in cutting excavation of Zhonghe to Haishiwan highway is introduced in this paper. The design of blast-hole arrangement, blasting parameters,two checking methods of the minimum safety distance among adjacent charges in multi-hole springing blasts, some key drilling parameters and hole-spacing …
Safe distance for blasting Blasting hazards: blasting earthquakes, air shock waves, scattered debris, toxic gases. Blasting must determine the scope and safety distance of blasting hazards, and set up warning and safety protection measures. ① Safe distance for blasting flying stones Blasting type Minimum safe distance for individual flying stones Shallow hole blasting to …
Blasting constitutes a crucial aspect of mining and construction activities, influencing both productivity and safety. The process of blasting in mining and construction operations demands meticulous attention to various factors including rock type, blast area dimensions, and the selection of explosives (Yang et al., 2019, Qiu et al., 2018).
GB 6722-2014 English Version - GB 6722-2014 Safety regulations for blasting (English Version): GB 6722-2014, GB/T 6722-2014, GBT 6722-2014, GB6722-2014, GB 6722, GB6722, GB/T6722-2014, GB/T 6722, GB/T6722, GBT6722-2014, GBT 6722, GBT6722
The components of a drill rig are (1) the rig itself, which supplies the power to mobilize, drill rock, and remove the drill cuttings from the hole; (2) the mounting; (3) the drill steels or drill string; …
School of Resources & Safety Engineering, Wuhan Institute of Technology, Hubei, Wuhan 430074, ... the guttering technology for improving the deep-hole blasting of …
Where: q is explosive consumption of unit volume rock blasting, 0.4 kg/m3; a is distance between holes, 3.0 m; b is row spacing, selected according to Figure2; H is hole depth, from 11 to 12.6 m. Calculated explosive consumption of different depth: charge 37.1 kg for hole depth 11 m; charge 40.5 kg for hole depth 12m and charge 42.5 kg for hole depth 12.6 m.
In order to prevent the impact of blasting vibration on the TBM, the safety distance is larger than 30 m. The hole-by-hole delayed detonating network with electronic detonator is selected with MS-3 (50 ms) different for each borehole, and the delay time is selected with MS-5 (100 ms). ... The deep-hole blast model used in this study ...
Flyrock represents a significant and fundamental challenge in surface mine blasting, carrying inherent risks to humans and the environment. Consequently, accurate prediction, minimization, and identification of the factors influencing flyrock distance are imperative for effective control and mitigation of its destructive consequences. Machine learning and artificial …
Peledakan lubang dalam (deep hole blasting) merupakan Cara peledakan jenjang kuari atau tambang terbuka dengan menggunakan lubang tembak yang dalam disesuaikan dengan tinggi jenjang; ... (safety distance) antar lubang. Contoh proses detonasi terjadi pada jenis bahan peledakan antara lain: + TNT : C7H5N3O6 > 1,75 CO2 + 2,5 H2O + 1,5 N2 + 5,25 …
Domestic large and medium-sized open pit mines are basically drilled with a roller rig, and their maximum penetration depth can reach 25.0 m.If it is calculated by the conventional ultra-deep 2.0~2.5 m, the maximum section height of the blasting should be 22.5~23.0 m, which is 1~1.5 m away from the standard two levels (the general mine step height is 12.0 m).
The Datong Mine was a background to study the blast crush zone and drainage influence range following deep-hole blasting with holes laid in coal seams, which resulted in a 24% increase in gas flow ...
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 placed …
Due to the hard roof caving step distance, ... analyzed the regulation effect of coal rock structure and the mechanism of load reduction and shock absorption of roof deep hole blasting in the process of working face mining. Chen et al. analyzed the influence of explosion stress wave generated by ultradeep hole blasting in coal mine roof on the ...
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 front row cannon holes; L is the drilling depth; L1 is the length of the medicine; L2 is the blockage length; Pole distance; B is the row distance; B is the safe distance from the front row drilling center of the …
here R s-blasting safety distance, m; V-vibration spee d at safety range, ... deep-hole blasting at the open pit coal mine usually results in a large amount of irregular …
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 [3, 5].The largest …
(2) The holes should be arranged to avoid rock fracture zones and thick mud interlayers. The first row of blast holes should leave a safe operating cliff distance of ≥2.5m. …
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 ...
When the distance between the blasting hole and the control hole is set to 3 m, the per- ... 1 School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China ... used deep hole blasting to carry out tests on rock roadway
A case study was conducted using 258 blasting data samples to develop these models. Key factors influencing flyrock were identified: blast hole burden distance, maximum instantaneous charge, and rock brittleness index. Using these factors, a flyrock possibility assessment chart was created to enhance the safety of small-scale mining operations.
Deep-hole blasting and chamber blasting technology are widely used in mining and large- ... It is observed that when the distance between millisecond blasting holes is equal to greater than 5 m ...
Deep hole blasting Deep hole blasting is the blasting method that uses drilling equipment to drill deeper holes as the charge space of mining explosives. The deep hole blasting in open pit mine is mainly bench …
Applying deep hole blasting in hard composite roof caving along goaf in deep well. Jan 2013; 1588; ... In addition to the distance from the blasting center and the charge amount, the influence of ...
Application of advanced deep hole blasting technology for thick and hard roof weakening in Xinji Coalmine . Shoulong. Ma. 1,* 1 . ... The blasting step distance of 25m and the corresponding blasting parameters . Academic Journal of Engineering and Technology Science ISSN 2616-5767 Vol. 2, Issue 2: 110-117, DOI: 10.25236/AJETS.020047 ...
But so far, the mechanism of deep-hole blasting technology for controlled roof caving, in respect of the shallow depth seams beneath a room mining goaf, remains to be studied systematically. ... The 3-1-2 Coal Seam is beneath the 3-1-1 Coal Seam with a distance about 6.0 ... 3.3 MPa; n is safety factor, 1.5; and q the overlying strata's load, 1 ...
The Datong Mine was a background to study the blast crush zone and drainage influence range following deep-hole blasting with holes laid in coal seams, which resulted in a 24% increase in gas flow ...
Based on an open-pit deep-hole blasting test. Jiang et al. conducted an analysis of the vibration characteristics caused by blasting on pipelines at various burial depths and proposed safety control standards for pipeline vibration velocity. Other scholars have studied the influence of steel large-diameter pipelines on resistance to dynamic ...
5. 2 9 2 21 8 4 17 Weightage of fatal accidents in non-coal mines due to explosives during 1996-2011 Solid Blasting Projectiles - 3% Deep Hole Blasting Projectiles - 14% Secondary Blasting Projectiles - 3% Other Projectiles - 33% Misfires/Sockets(While Drilling into) - 13% Misfires/Sockets(Other than Drilling into) - 7% Other Explosive accidents - 27% 21
The research results demonstrated that in the single blasting-hole model, a triangular crack area caused by reflected stress waves appeared at the rock interface of rock medium I near the blast hole.