Deep hole blasting safety distance

Damage distribution characteristics and space optimizations

Deep hole blasting, a prevalent underground mining method, is particularly common in metal mines due to its high blasting efficiency, costeffectiveness, and safety(Li, 2015, Wu et al, 2023, Zhang et al, 2021b) The effectiveness of deep hole blasting largely hinges on the design of Before the deephole blasting, the mine tremor centrum basically located in the Effective evaluation of dee2021年4月6日  This paper proposes the vibration reduction measures for the boulder deephole blasting to meet the construction safety To achieve this purpose, the field test was applied to Assessing and controlling of boulder deephole blasting 2022年11月1日  Before the deephole blasting, the mine tremor centrum basically located in the thickandhard sandstone in far field Deephole blasting ruptures or weakens the thickand Effective evaluation of deephole blasting for controlling

A study on hollow effect and safety design of deep crossing caverns

2021年5月1日  When the blasting zone is from 125 times of the cavern diameter in front of the pressure pipeline to the opening of caverns, the influence of hollow effect on the vibration of 2022年7月11日  Rock burst is one of the challenging problems restricting the safe and highefficiency mining of deepburied coal seams, and roof deephole blasting (RDHB) is commonly practiced in highly burstprone zones in coal Investigating the destressing mechanism of roof 2022年10月20日  Finally, the safety distance problem of the grouting curtain in blasting construction is solved using the modified Sadov’s formula The results show that the Modifying Sadov’s Empirical Formula for GroupHole Blasting 2023年8月31日  According to the microseismic, support working resistance and realtime stress monitoring results, the workingface deephole blasting technology could actively break the Insight and Effectiveness of WorkingFace DeepHole Blasting

Calculation of hole spacing and surrounding rock damage

2022年12月25日  Based on the theory of the combined action of stress waves and explosive gas, a formula for calculating the peripheral hole distance that integrates the effects of in situ 2022年9月15日  Longhole stoping is a productive exploitation technique for underground metalliferous deposits The method consists of deephole blasting with increased explosive Influence of ring blasting pattern on the safety of nearby2023年9月7日  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 Optimization of Borehole Layout in Upwards MediumDeep Hole Cut Blasting2019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

Crack Extension Characteristics of Deep Hole Presplitting Blasting

2024年11月2日  In underground coal mines, deephole presplitting blasting (DHPB) is an effective means of attenuating or even eliminating the risk of rockburst induced by the breakage of hardthick roof The insitu stress field and drill geometry are the controlling factors for the performance of DHPB, but their impacts on the rock blasting crack extension characteristics 2024年10月9日  The safety assessment and control of largediameter pipelines under tunnel blasting at ultrasmall clear distances is a significant problem faced in construction However, there has been no reference case for the quantitative comparison of the disturbance degree of surrounding rock by using two blasting schemes of nonelectric detonator design and Evaluation of Cumulative Damage and Safety of Large 2020年1月3日  in order to study the blast induced wave propagation and attenuation for various scaled distance Safe charges have been recommended after regression analysis and suitable blast patterns were recommended for safe and productive blasting Keywords : Ground vibration; Fly rock; Air overpressure; Deep hole; Overburden benches ISSN: 26894629Blast Design for Controlling Some of Environmental 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 serious influence on freezing pipes and freezing wall In this study, the periphery hole charge and charge structure was optimized, and the blasting model Hard rock deep hole cutting blasting technology in vertical

Study on the technology of permeability enhancement of deep hole

2023年12月29日  When the distance between the blasting hole and the control hole is set to 3 m, the permeability improvement is the most ideal Compared with natural extraction, the limit gas extraction amount of drilling hole after deep hole presplitting blasting is 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 2024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 In the above study, deep hole blasting technology is the main method to improve the speed of excavation of vertical shaft, and large diameter empty hole blasting technology has never been used in frozen hard bedrock section vertical shaft construction Recently, cutting forms of vertical shaft deep hole blasting are parallel cylindrical cutting 1579 Hard rock deep hole cutting blasting technology

Coupling Technology of Deep‐Hole Presplitting Blasting and

2021年3月23日  The test site is located in the bottom extraction roadway of 15–15160 machine road in the No 8 Mine of Pingdingshan Coal Mining Group Co, Ltd The pressure holding hole and the blastinginjection hole are arranged, and the distance between the two holes is 100 m2022年7月22日  To address the problems with deephole presplit blasting intended to fracture and improve the permeability of deeply buried, soft, highgascontent coal seams, a method using a blasthole and a Blasting for Fracturing and Improving the 2023年9月1日  Several scholars have conducted extensive studies on cut blasting technology over the past few decades Langefors et al 11 proposed a construction method for largediameter 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 largediameter holesTheory and numerical simulation of deep hole cut blasting 2019年12月5日  After statistical analysis, due to the supplemental blasting of the central hole, the average blasting footage was increased by 035 m, and the average specific charge was reduced by 043 kgm− (PDF) Key Blasting Parameters for DeepHole Excavation in

Refined Design and Optimization of Underground Medium and Long Hole

2023年3月27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 effect To solve the problem of the parameter design and optimization design of mediumdeep hole blasting in underground mines, a method of parameter design and the optimization of medium 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 2015年5月30日  The results show that using large diameter empty hole blasting technology in vertical shaft construction of frozen hard rock section can significantly improve the speed of vertical shaft Hard Rock Deep Hole Cutting Blasting Technology in Vertical 2024年3月1日  Assessing and controlling of boulder deep‑hole blasting‑induced vibrations to minimize impacts to a neighboring metro shaft amount of cutting holes and safe distance of blasting vibration in the up–down crosstunnels through eld monitoring and numerical simulation Based on the monitoring data ofAssessing and controlling of boulder deephole blasting

(PDF) Coupling Technology of DeepHole Presplitting Blasting

2021年3月23日  Gong et al studied the size of endmining coal pillar affected by the hard roofs and proposed a method combining presplitting and deep hole blasting to attenuate the abutment stress and reduce 2024年1月2日  Deephole blasting and chamber blasting technology are widely used in mining and large scale earthrock excavation or landfill projects, due to their advantages of high efficiency and low costDetection and Recognition Method of Misfire for 2021年5月1日  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 highpressure gas evenly flows into the broken rock to form a gassolid mixture, which is thrown from the cut cavity longitudinally due to the volume Theoretical and numerical investigation of deephole cut blasting 2013年12月1日  The primary measure to prevent large area roof weighting is to weaken roof rock mass strength by changing its mechanical condition At present, the main control technologies are deephole blasting, water injection for softening rock mass, and backfilling in the minedout area [9], [10]Many reports show that deephole blasting technology is an effective measure for roof Deephole presplit blasting mechanism and its application

Detection and Recognition Method of Misfire for Chamber (DeepHole

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 cost2022年10月20日  A modified expression of Sadov’s formula is obtained The onsite blasting parameters of the grouphole blasting are verified Finally, the safety distance problem of the grouting curtain in blasting construction is solved using the modified Sadov’s formulaModifying Sadov’s Empirical Formula for GroupHole Blasting 2024年9月7日  22 Modelling of GunHole Arrangement along the Towards According to the specific conditions of the mine along the towards of the arrangement of holes As shown in Figs 3 and 4, the mine uses a 15 m diameter backhoe drilling rig to construct the blasting free space, and to avoid the formation of a “ > ” shape in the free space, the first row of two holes, located Simulating Blasting Parameters for Sharp Inclined Thin Vein 2024年9月14日  Coastal underground engineering projects are prone to seawater intrusion during blasting operations, posing significant risks to the safety of construction personnel and the structural integrity of the projects To ensure the safety of blasting operations in areas at risk of seawater intrusion, this study focuses on a section of a coastal tunnel that is at risk of such Vibration Safety Threshold and Control Technology for Blasting

Study of Two‐Step Parallel Cutting Technology for Deep‐Hole Blasting

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 inevitable2020年8月29日  Control the number of blasting holes and unit detonating charge over equal segments of fuse and detonating cord, reduce the impact of closerange blasting vibration of vertical deep holes on fixed Optimal Design of Presplit Blasting Network of Deep 2023年3月11日  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 2023年9月7日  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 Optimization of Borehole Layout in Upwards MediumDeep Hole Cut Blasting

Key Blasting Parameters for Deep‐Hole Excavation in an

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 2024年11月2日  In underground coal mines, deephole presplitting blasting (DHPB) is an effective means of attenuating or even eliminating the risk of rockburst induced by the breakage of hardthick roof The insitu stress field and drill geometry are the controlling factors for the performance of DHPB, but their impacts on the rock blasting crack extension characteristics Crack Extension Characteristics of Deep Hole Presplitting Blasting 2024年10月9日  The safety assessment and control of largediameter pipelines under tunnel blasting at ultrasmall clear distances is a significant problem faced in construction However, there has been no reference case for the quantitative comparison of the disturbance degree of surrounding rock by using two blasting schemes of nonelectric detonator design and Evaluation of Cumulative Damage and Safety of Large 2020年1月3日  in order to study the blast induced wave propagation and attenuation for various scaled distance Safe charges have been recommended after regression analysis and suitable blast patterns were recommended for safe and productive blasting Keywords : Ground vibration; Fly rock; Air overpressure; Deep hole; Overburden benches ISSN: 26894629Blast Design for Controlling Some of Environmental

Hard rock deep hole cutting blasting technology in vertical

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 serious influence on freezing pipes and freezing wall In this study, the periphery hole charge and charge structure was optimized, and the blasting model 2023年12月29日  When the distance between the blasting hole and the control hole is set to 3 m, the permeability improvement is the most ideal Compared with natural extraction, the limit gas extraction amount of drilling hole after deep hole presplitting blasting is Study on the technology of permeability enhancement of deep hole 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 2024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

1579 Hard rock deep hole cutting blasting technology

In the above study, deep hole blasting technology is the main method to improve the speed of excavation of vertical shaft, and large diameter empty hole blasting technology has never been used in frozen hard bedrock section vertical shaft construction Recently, cutting forms of vertical shaft deep hole blasting are parallel cylindrical cutting

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