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Middle and deep hole blasting warning distance Middle and deep hole blasting warning distance Middle and deep hole blasting warning distance
Theory and numerical simulation of deep hole cut blasting based
2023年9月1日 This present study proposes an efficient method for charging and detonation inside and between boreholes called disperse charge and staged detonation (DCSD) cut 2023年9月7日 In upwards mediumdeep hole cut blasting, many confinement effects exist due to the small number of free surfaces, which is mainly provided by an empty hole If the cut Optimization of Borehole Layout in Upwards MediumDeep Hole Drilling and blasting techniques are extensively employed in the construction of shafts, roadways, tunnels, and mining operations(Li et al, 2023a, Liu et al, 2024, Xie et al, 2016)Deep hole Damage distribution characteristics and space optimizations of the 2024年10月2日 In this paper, the reasonable safe distance between the deephole blasting position and the grouting curtain was studied the numerical model of the interaction between Safe Distance between the DeepHole Blasting and the Grouting
Study on parameter optimization of deep hole cumulative blasting
2022年3月24日 The simulation results of cumulative blasting show that a blasting hole diameter of 89 mm, a charge length of 20 m, and a charging position in the middle of the blasting hole 2023年3月11日 In this paper, a disperse charge cut blasting method was proposed to address the issues of low excavation depth and high block rate in deep hole undercut blasting First, a Theoretical and numerical simulation investigation of deep hole 2021年5月1日 In this study, several parameters affecting the CCFT cut blasting effect, including the hole depth, hole spacing (distance between a cut hole and the fragmentthrowing hole) Theoretical and numerical investigation of deephole cut blasting 2023年3月27日 The article proposes a method of parameter design and optimization of mediumdeep hole blasting based on the blasting crater test and numerical simulation analysis This Refined Design and Optimization of Underground Medium and
Assessing and controlling of boulder deephole blastinginduced
2021年4月6日 This paper focuses on the vibration reduction measures of boulder deephole blasting which can not only achieve blasting effect but also ensure construction safety, so as 2019年12月5日 In this study, through theoretical analysis of tunnel blasting, the layout of cutting holes was found to be the key factor controlling the blasting performance The deephole Key Blasting Parameters for Deep‐Hole Excavation in an 2023年3月11日 Drilling and blasting methods have been used as a common driving technique for shallowhole 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 Theoretical and numerical simulation investigation of deep hole 2015年5月21日 The mechanism of preventing rockburst through deephole precracking blasting was studied based on experimental test, numerical simulation, and field testingThe Mechanism and Application of DeepHole
Testing study on middle deep cuthole blasting in hard rock tunnel
2007年7月1日 Aiming at the problem of poor blasting effects that exists universally in hard rocks, the middle deep hole blasting tests were done in hard rock tunnels at Shuangyang Mine; and the blasting test 2021年10月31日 In underground coal mines, the deephole blasting (DHB) technology is generally adopted for thick hardroof control This technology uses the energy released by explosives to weaken the energy Mechanism of HardRoof Rock Burst Control by the DeepHole Blasting The key to prevention of hardroof rock burst is the modification of thick hard roof by weakening the strata structure At present, the commonly adopted methods include deephole 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 Mechanism of Hard‐Roof Rock Burst Control by the Deep‐Hole Blasting 2022年12月31日 This study proposes an incremental extreme extraction method based on the waveform characteristics of ground vibration signals obtained from openpit mines to investigate the distribution and characteristics of ground vibration from deephole blasting Firstly, an incremental extreme extraction method is proposed based on the waveform characteristics of Characteristics and Energy Distribution of BlastInduced Ground
Conditions For DeepHole Blasting In Opencast Coal Mine
2023年2月16日 40 The entire operations of conduct of safe deephole drilling and blasting operations in the mine including transport of the explosive to the site of its use, shall be placed under the overall charge of a competent person holding First class manager’s certificate, hereinafter referred to as “Blasting Officer”, duly appointed in writing by the manager for the 2019年12月5日 The empty holes not only provide initial space for rock blasting but also convert the stress state around the rock as a free surface After the detonation of the charging hole, the shock wave generated by the explosion quickly attenuates into a stress wave []When the stress wave is transmitted to the empty hole, the reflection phenomenon will occur, leading to the Key Blasting Parameters for Deep‐Hole Excavation in an Meanwhile, the possibility of coal and gas outburst in low gas mines is small, and deephole blasting could be applied Deephole presplitting blasting will further strengthen the coal fracturing density and weakening range, as well as promote the safety degree of pressure relief 41 Theoretical Analysis of Blasting Parameters for Weakening Coal4 Safety and Applicability of Pressure Relief Effect with DeepHole 2023年2月1日 China is the world's largest coal producer and consumer (Li et al 2019; He et al 2020)Though the proportion of coal in China’s primary energy consumption has decreased from 692 to 568%, it is still the major energy accounted for more than half of the total (Chang et al 2016)Therefore, how to make coal production safer and more efficient is still an important A Novel Method of Combined Deep Hole Blasting for GobSide
(PDF) Study on parameter optimization of deep hole cumulative blasting
2022年3月24日 Previously conducted studies have established that the rationality of the parameters of mediumdeep hole blasting is one of the main factors affecting the blasting effect2023年8月31日 The grandscale suspended roofs overlying the goaf are commonly developed under thickhard 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 workingface deephole blasting technology has Insight and Effectiveness of WorkingFace DeepHole Blasting for 2024年10月28日 Among them, deep hole presplit blasting is widely used to improve the efficiency of gas extraction in low permeability coal seams because of its good local reflection improvement effect, quick Study on antireflection of deep soft and high gas coal seam floor 2019年11月14日 Deephole blasting and chamber blasting technology are widely used in mining and largescale earthrock excavation or landfill projects, due to their advantages of high efficiency and low costDetection and Recognition Method of Misfire for Chamber (DeepHole
(PDF) Key Blasting Parameters for DeepHole Excavation in an
2019年12月5日 Spatiotemporal evolutionary cloud diagram of effective stress of two holes (a) 240 μs (b) 280 μs (c) 420 μs (d) 1820 μs 2021年4月6日 This paper proposes the vibration reduction measures for the boulder deephole blasting to meet the construction safety we selected 10 monitoring points in the middle area of boulder blasting side and shaft side, and it decreases with the increase of the distance from the blasting sourceAssessing and controlling of boulder deephole blastinginduced 2021年3月23日 To study the influence of the distance from a control hole to a blasting hole on fractures’ evolution laws, finite element software LSDYNA is used to perform presplitting blasting of the deep hole for different distance coalCoupling Technology of Deep‐Hole Presplitting Blasting and 2021年6月3日 Due to the high in situ stress of the deep rock mass and the restraining effect of the surrounding rock, the deep hole blasting of vertical shaft faces the problems of low borehole utilization rate and poor blasting effect In this regard, this paper proposes a deep hole multistage cut blasting technology of vertical shaft Preliminary engineering practice shows that such cut Numerical analysis of deep hole multistage cut blasting of
Theory and application of deep hole floorbreak blasting in floor
2016年7月1日 Zhao et al [17] released high stress accumulated at the floor and coal in sidewalls by deephole floor breaking combined with floorbreak blasting at the middle part of the floor with that in 2022年7月22日 Blasting for Fracturing and Improving the Permeability of Deep, Soft, Outburst Prone Coal Seams Using Blasthole and Relief Hole Drilled into the Underlying Stratum: Optimal Hole Distance July 2022 Blasting for Fracturing and Improving the Permeability of Deep, 2022年10月11日 Gas explosions and outbursts are a risk in coal mining [1,2]Gas drainage [] benefits increase mine safety and improve mine economics [4,5]Deephole presplitting blasting is an effective technique of gas control Effect and Response of Coal and Rock Media 2022年9月14日 Investigating the destressing mechanism of roof deephole blasting for mitigating rock bursts in underground coal mines September 2022; Geomatics, Natural Hazards and Risk 13(1):25082534;Investigating the destressing mechanism of roof deep
Numerical simulation of deephole blasting and its application
2009年12月1日 The deephole blasting frequency band energy distribution was analyzed in wavelet analysis method when the distance between control hole and blasting hole is 12 mAiming at the problem of poor blasting effects that exists universally in hard rockst,he middle deep hole blasting tests were done in hard rock tunnels at Shuangyang Mine;and the blasting test results of different kinds of cutting forms have been gottenThrough comparison,the compound barrel cutting is proved to be completely fit for middle deep hole blasting;and the utilization rate TESTING STUDY ON MIDDLE DEEP CUTHOLE BLASTING IN According to the blasting energy balance theory presented by Livingston,series of crater experiments of single hole blasting and variable distance multihole simultaneous blasting were performed in the field of Anqing Copper MineThe blasting crater curves of two different charges,the relationship between blasting crater volume and charge embedment depth and Study of Parameters of Large Diameter Deep Hole Blasting Based 2 Deep hole dispersed cut blasting model and its mechanism analysis 21 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 technology’s core is represented by changing the traditionalTheoretical and numerical simulation investigation of deep hole
Study on the technology of permeability enhancement of deep hole
2023年12月29日 In order to increase the permeability of low permeability and high gas coal seam and improve the efficiency and utilization of gas extraction, the permeability enhancement technology of deep hole presplitting blasting is proposed, and the mechanism of blasting induced cracking of deep hole presplitting blasting is analyzed ANSYS/LSDYNA is used to simulate 2015年5月30日 Hard Rock Deep Hole Cutting Blasting Technology in Vertical Shaft Freezing Bedrock Section Construction May 2015; Empety hole distance and diameter ratio AUTHOR'S PERSONAL COPYHard Rock Deep Hole Cutting Blasting Technology in Vertical 2019年2月3日 Deephole blasting measures were used to relieve the pressure in Then, their stress wave gradually decayed once again and eventually reached a zero value In the middle and late stages of the blasting process, and the reasonable distance between the adjacent holes was determined to be about 10 m (2) 4 Fractal Layout of the DeepHole Blasting in Hard Roof2024年4月22日 The hole distance is 462 m, the row distance is 4 m, while the maximum principal stress at the middle and back sections amounts to 6 × 10 4 N "Research on Optimization of an OpenBench DeepHole Blasting Parameter Using an Improved Gray Wolf Algorithm" Applied Sciences 14, no 8: 3514 https: Research on Optimization of an OpenBench DeepHole Blasting
The Mechanism and Application of Deep‐Hole Precracking Blasting
Deephole precracking blasting (DHPB) is conceptually defined as blasting in the coalrock mass with a blast hole with a depth of more than 10 m to develop fractures in the coalrock mass A coal seam with thick hard roof strata, such as Qianqiu mine of Yima Coal Industry Group and Huafeng coal mine of Xinwen Mining Group, uncaved roof strata in minedout area could accumulate 2015年5月15日 Using the traditional cutting blasting technology in vertical shaft construction has some features, eg slows driving speed, gangue with large volume and throwing high Moreover, large explosive charge initiation has a Hard rock deep hole cutting blasting technology in Vibration in DeepHole Blasting Buildings 2023, 13, 899https:// and stable attenuation condition as the distance increases This proves the reliability of the proposedGround Vibration in DeepHole Blasting ResearchGate2024年10月15日 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 Prediction and minimization of blasting flyrock distance, using deep
Effective evaluation of deephole blasting for controlling strong
2022年11月1日 Before the deephole blasting, the average distance from the mine tremor centrum to coal seam is 117 m, which basically located in the thickandhard sandstone in far field As the blasting section locates in the range of 43–87 m above the coal seam (see Fig 4), 2011年9月1日 Melkinove and Marchenko believe that the secondary tension wave can be simply produced by the power deck method According to its theory, this secondary wave's reflection can make a network of Theory and Practice of AirDeck Blasting in Mines and Surface 2012年11月1日 Adopted the technology of middle empty hole in parallel hole cut blasting, by measuring the blasting vibration velocity, the utilization rate of borehole, the half eye tracking rate, and so on Experimental Study on the Technology of Middle Empty Hole 2023年3月27日 It has been proved that reasonable blasting parameters are core to ensuring the quality of mediumdeep 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 disturbances on the rock massRefined Design and Optimization of Underground Medium and Long Hole
Effect of initiation pattern on rock damage and blasting seismic
2023年3月29日 In multihole blasting, the design of the initiation pattern is critical for the blasting effectiveness, but its effects on rock damage and blasting seismic are still unclear2021年5月1日 To calibrate the parameters of the RiedelHiermaierThoma (RHT) model, Xie et al (2017) and Li et al (2021) compared the simulation results with the experimental results of Banadaki (2010)Theoretical and numerical investigation of deephole cut blasting