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Drilling and blasting methods have been used as a common driving technique for shallow hole driving and blasting in rock roadways With the advent of digital electronic detonators and the need for increased production efficiency the traditional blasting design is no longer suitable for deep hole blasting In this paper a disperse charge cut blasting method was proposed to
·Large blast holes may be as large as 9 inches or 225 mm in diameter while small holes may be as small as inches or 38 mm in diameter Hole orientation is influenced by project topography excavation boundary geometry bench height bench access and many other factors Equipment limitations will also influence hole orientations
The key to prevention of hard roof rock burst is the modification of thick hard roof by weakening the strata structure At present the commonly adopted methods include deep hole blasting [] and hydraulic fracturing [] The principle of DHB for lowering rock burst risk is to use the energy released by explosives to increase the beddings and fractures of specific strata weaken their
·The influence radius of single hole blasting was m the hole diameter of double hole blasting was 113 mm the hole spacing was m and the delayed blasting time was 25 ms
·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
·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
·The charging coefficients of blasting holes are The directional energy gathering blasting hole adopts the energy gathering device to charge m the hole is sealed m and the single hole charge is 24 kg Non directional blasting holes are charged with m PVC pipe m sealed and the single hole charge is 25 kg
·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
Semantic Scholar extracted view of "Experimental research of deep hole cumulative blasting in hard roof weakening" by Shang Deng ying which may affect the safety of mine production In this Expand 8 [PDF] the initial pressure step distance and periodic pressure step distance of the roof and the Expand PDF
·In hard rock deep hole blasting excavation blastholes are rarely utilized due to the clamping effect of the lower rock which affects excavation progress and restricts the development and
·In hard rock deep hole blasting excavation blastholes are rarely utilized due to the clamping effect of the lower rock which affects excavation progress and restricts the development and
·Using the traditional cutting blasting technology in vertical shaft construction has some features slows driving speed gangue with large volume and throwing high Moreover large explosive charge initiation has a serious influence on freezing pipes and freezing wall In this study the periphery hole charge and charge structure was optimized and the blasting model
The blasting parameters of the cut hole resulted in a poor blasting effect The cutting hole depth of 5200 mm was too deep and the rock mass with stability of greater than 12 was too hard These factors caused a large clamping effect so the cutting hole utilization rate was low and poor blasting effects were inevitable
·Several scholars have conducted extensive studies on cut blasting technology over the past few decades Langefors et al 11 proposed a construction method for large diameter drilling in tunnels based on the rock throwing and deformation characteristics of cut blasting which laid the foundation for subsequent research on cut blasting for large diameter holes
·Rock damage and vibration attenuation are the basis of blasting design which will affect rock breaking results and the safety of structures buildings
·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
·The traditional cut blasting method involves establishing an empty hole in the center of a circle of cut holes During the cut blasting process the rock mass is broken under the effect of stress wave propagation and high pressure gas evenly flows into the broken rock to form a gas solid mixture which is thrown from the cut cavity longitudinally due to the volume
·The optimization of blasting operations greatly benefits from the prediction of rock fragmentation The main factors that affect fragmentation are rock mass characteristics blast geometry and explosive properties This paper is a step towards the implementation of machine learning and deep learning algorithms for predicting the extent of fragmentation in
The conventional wedge shaped cut blasting is not suitable for deep hole blasting since the method requires the explosives to be concentrated at the bottom of the borehole resulting in uneven fragmentation of the upper rock and difficulty in throwing the bottom
·Pilot Holes When the trench has been set out pilot holes needs to be dug at 25 30 m 80 100 feet intervals particularly at points where the new trench crosses existing services The duct/s shall extend a distance of at least beyond the edge of the road All excavated material and equipment must be placed and demarcated in such a
Only control blasting and wet drilling will be done Which will comply this condition 6 A distance of 15 meters surrounding the magazine or store house shall be kept clear of dried grass or bash or flammable materials Blaster will comply this 7 Where in any mine or part it is proposed to work by a system of deep hole blasting and/or
·2 Deep hole dispersed cut blasting model and its mechanism analysis Deep hole dispersed cut blasting technology As mentioned previously this paper proposes a deep hole dispersed charge cut blasting technology to improve the excavation eciency of deep hole cut blasting This tech nology s core is represented by changing the traditional
