MTW European Type Trapezium Mill
Input size:30-50mm
Capacity: 3-50t/h
LM Vertical Roller Mill
Input size:38-65mm
Capacity: 13-70t/h
Raymond Mill
Input size:20-30mm
Capacity: 0.8-9.5t/h
Sand powder vertical mill
Input size:30-55mm
Capacity: 30-900t/h
LUM series superfine vertical roller grinding mill
Input size:10-20mm
Capacity: 5-18t/h
MW Micro Powder Mill
Input size:≤20mm
Capacity: 0.5-12t/h
LM Vertical Slag Mill
Input size:38-65mm
Capacity: 7-100t/h
LM Vertical Coal Mill
Input size:≤50mm
Capacity: 5-100t/h
TGM Trapezium Mill
Input size:25-40mm
Capacity: 3-36t/h
MB5X Pendulum Roller Grinding Mill
Input size:25-55mm
Capacity: 4-100t/h
Straight-Through Centrifugal Mill
Input size:30-40mm
Capacity: 15-45t/h
Large and mediumsized mediumdepth hole blasting 200 meters away from the village safety method
Damage distribution characteristics and space optimizations of the
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 2023年9月7日 In the optimization of rock drilling and blasting parameters for highlayered mediumdeep holes, blasting simulations were carried out on the layout of the first round of Optimization of Borehole Layout in Upwards MediumDeep Hole 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 Theory and numerical simulation of deep hole cut blasting based 2024年11月16日 However, mediumdeep hole cutting blasting faces the challenges of large clamping action and unsatisfactory blasting efficiency The study proposes sectional charge Numerical Simulation on MediumDeep Hole Straight Cut Blasting
A newly developed blasting cut in tunnels; application of
2023年12月1日 In the new cut configuration, angular blast holes ranging from 76°∼80° were drilled together with 3 to 5 number of uncharged large holes as assistant factor for free space 2023年3月27日 The results of the field test showed that the design method of integrated blast crater test and numerical simulation analysis can effectively optimize the design of medium Refined Design and Optimization of Underground Medium and 2022年10月17日 The long and largediameter uncharged hole boring (LLB) method is an example of one of the cut blasting methods, which utilizes largediameter uncharged holes Assessment of the Blasting Efficiency of a Long and Large MDPIThe key inuencing factors of cut blasting are the cutting method, borehole diameter, hole space, and millisecond delay time [, 67] Cheng et al simulated wedge cut blasting with dierent Optimization of Borehole Layout in Upwards MediumDeep Hole
Study of the Double Wedge Cut Technique in MediumDepth
2021年1月6日 A double wedge cut was used to improve the cut effects in the mediumdepth hole blasting of rock roadways First, the cavity formation mechanisms of single wedge cut and 2020年1月10日 For the blasting difficulty existing in weak coalrock roadways, doublewedge cut blasting mode was utilized to optimize the arrangement of blasting holes Mediumlength hole Experimental study and application of medium‐length hole 2020年1月10日 In the experiment of medium‐length hole cut blasting test in a typical coal‐rock roadway, double‐wedge cut blasting is selected, and the depth of medium‐length hole reaches more than 18 m Experimental study and application of medium‐length hole blasting Most coal mines adopt blastholes with a depth of approximately 20 m to achieve an eective footage of 16 ~ 18 m, which cannot meet the requirement of coal mining for rock roadway excavation [21] Therefore, mediumdepth hole blasting, ie, blast hole depth greater than 25 m becomes an inevitable choice for improving the eective footageStudy of the Double Wedge Cut Technique in MediumDepth Hole Blasting
Study of the Double Wedge Cut Technique in MediumDepth Hole Blasting
2021年1月6日 In the experiment of medium‐length hole cut blasting test in a typical coal‐rock roadway, double‐wedge cut blasting is selected, and the depth of medium‐length hole reaches more than 18 m 2022年9月1日 Taking the Baizhushan Tunnel as the engineering background, this article put forward a theoretical basis for a holereducing layout method for largesection tunnel blastingLayout method and numerical simulation study of reducedhole blasting Download scientific diagram Damage zones around a blast hole from publication: A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways To overcome the problems of poor Damage zones around a blast hole Download Scientific Diagram2024年1月12日 Underwater rock blasting and surface blasting differ primarily in the environment they interact with water and air, respectively []One significant difference is the acoustic impedance, which is a measure of how sound travels through a medium [14, 15]Water has a much higher acoustic impedance compared to air []Secondly, we must consider the effects of Comprehensive review on principles and practices of underwater
Optimization of the matching relationship between the stemming
2023年10月16日 However, the above studies are aimed at openpit bench blasting or tunneling but do not consider cut blasting in the LDL mining method Cut blasting, openpit blasting, and tunneling blasting are subjected to different confinement conditions, eg, cut blast holes typically involve only one free face, and these methods also exhibit variations 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 shaft 2015年5月30日 Using the traditional cutting blasting technology in vertical shaft construction has some features, eg slows driving speed, gangue with large volume and throwing highHard Rock Deep Hole Cutting Blasting Technology in Vertical 2018年6月11日 Largescale drilling and blasting are the need of the hour to maintain the production pace from the underground mining Such largescale blasting may be a threat to the structuresBlast design for underground long hole stope to safeguard
Numerical Study Investigating the Blasting Efficiency
2023年2月6日 The long and largediameter uncharged holeboring (LLB) method is a cutblasting method used to reduce vibration induced by blasting This method typically involves creating an uncharged hole with 2024年10月1日 For the underground mining of the mine, the −230 m level 7S1 mining area was selected as the experimental mining area, utilizing the VCR stowing mining method The undercut blasting adopts the mediumdeep hole fanshaped blasting method, and the layout of the undercut engineering is shown in Fig 15, where 1 represents the undercut roadway, 2 Study on the optimization of blasting parameters and blastholes (a)Refined Design and Optimization of Underground Medium and Long Hole 2020年9月10日 Figure 6: Effective stress wave evolution of cut blasting model for a large charge diameter (a) t 045 μs (b) t 150 μs (c) t 320 μs (d) t 400 μs (e) t 490 μs (f ) t 600 μs "A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways"Figure 6 from A Study on Cut Blasting with Large Diameter
Experimental study and application of medium‐length hole blasting
Roadway )2024年11月16日 The efficiency of rock excavation depends on cut blasting However, mediumdeep hole cutting blasting faces the challenges of large clamping action and unsatisfactory blasting efficiency The study proposes sectional charge cutting blasting technology and analyzes the mechanism of cavity formation by establishing a numerical model The results Numerical Simulation on MediumDeep Hole Straight Cut Blasting 2023年2月10日 Drilling and blasting designs for parallel hole cut and Vcut method in excavation of underground coal mine galleriesDrilling and blasting designs for parallel hole cut and Vcut method 2020年12月1日 A numerical model with dimensions of 400 × 400 × 200 mm was built to simulate the dynamic response and damage evolution of lateral blasting, as shown in Figure 2Rock damage control for largediameterhole lateral blasting
A newly developed blasting cut in tunnels; application of
2023年12月1日 The most costeffective method of rock excavation is drill and blast operations (Hoek, 1980, Harrison and Hudson, 2000, Yilmaz and Unlu, 2014, Mohammadi and Barati, 2018)In hard rock tunneling excavated by this method, the primary goal of design is to develop an effective pattern that minimizes operational cost by achieving minimum time cycle and 2021年6月3日 On this basis, Cheng et al (Cheng et al, 2020) and Liu et al (Liu et al, 2019) carried out a numerical simulation study on the cut blasting of vertical shaft, which visually demonstrated the stress superposition and reflection stretching phenomena of the blasting stress wave at the largediameter hole in the cut blasting, and verified the guiding effect of large Numerical analysis of deep hole multistage cut blasting of 2021年3月13日 200 m from blasting zone, (c) 300 m from blasting zone, (d) 400 m from blasting zone, and (f) 500 m from blasting zone 17 Geo fl uids The relationship between the maximum CO concentraShaped Charge Hydraulic Blasting: An 2020年12月1日 For the depth of 12 m, this may have been due to the existence of initial cracks For the bottom, this may have been caused by the mediumlength hole blasting in the lower chamber, and it can be seen that the wave speed decreased gradually with increasing depth After blasting, it can be seen that the wave speed was approximately 3700 m/sRock damage control for largediameterhole lateral blasting excavation
Research on the damage characteristics of rock masses based on
2023年11月6日 Research on the damage characteristics of rock masses based on double guidehole blasting under high insitu stress2024年5月28日 This paper puts forward the theory and method of reducedhole blasting for large crosssection tunnels, as an alternative to the traditional drilling and blasting method of the “more holes, less Research on the theory and method of reducedhole blasting for large 2020年1月10日 When the mediumlength hole blasting of 18 to 25 m is carried out, the existing hole cut blasting methods have poor applicability to roadway blasting excavation of coal mines with complicated geological conditions 2 Therefore, it is important to study the blasting mechanism of the medium and deep hole cutting under different conditions and improve the Experimental study and application of medium‐length hole blasting 2019年11月25日 Presplit blasting can reduce vibration and back impact induced by cast blasting, thus resulting in a smooth bench slope To design reasonable presplit blasting parameters, this research investigated the formation of presplit faces based on the explosion mechanics and revealed the cracking mechanism of presplit blasting According to the stress A Preliminary Study on the Design Method for LargeDiameter DeepHole
Blasting mechanics: Blasting design standards #Site Title
2019年2月21日 About this fourpart series In 1963, Pit Quarry published a series of articles on the mechanics of blasting authored by Richard Ash, a longtime professor of mining engineering at the School of Mines Metallurgy at the University of MissouriRolla The content within each article was ahead of its time, putting forth cuttingedge concepts about the mechanics of rock 2023年2月11日 Drilling and blasting designs for parallel hole cut and Vcut method in excavation of underground coal mine galleriesDrilling and blasting designs for parallel hole cut and Vcut method 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 holeOptimization of Borehole Layout in Upwards MediumDeep Hole Cut Blasting2019年8月28日 Traditionally, top hammer equipment allows effective drilling to a depth of 30 to 40 ft (9 to 12 meters) However, drill manufacturers’ ongoing work and development has improved control and drill string tooling to increase effective hole depth to the 60 to 80 ft under reasonable site geologic conditionsPQ University Lesson 4: Drilling Blasting Pit Quarry
3 Simulation of the SingleHole Blasting Wiley
1 Introduction As an important construction method, engineering blasting is widely used in production and construction activities such as mining engineering, hydraulic engineering, tunnel engineering, and nuclear power engineering 2024年5月15日 The technique of multilonghole blasting with large empty holes has been used in practice to break rock mass However, the damage mechanism of rock mass surrounded by empty holes and boreholes Damage and Fragmentation of Rock Under MultiLong vibration Cheng et al (2023) proposed a mediumdeep holehollowing and blasting method based on directional precracking with slit charging to improve the tunneling progress Gao et al (2022) improved the hollowing and blasting initiation method and proposed a hybrid initiation method based on the reverse transmission of neighboring holesResearch on the theory and method of reducedhole blasting for large A calculation method for determining the critical depth of the central hole was proposed by Lou et al 22 based on his theory of the Vcut blasting mechanism The existence of empty holes can create favourable crushing conditions for rock during the blasting process of straight cutsDrilling and blasting designs for parallel hole cut and Vcut method
Assessment of the Blasting Efficiency of a Long and Large MDPI
2022年10月17日 Cut blasting is one of the most essential processes to reduce blastinduced vibration in tunnel blasting The long and largediameter uncharged hole boring (LLB) method is an example of one of the cut blasting methods, which utilizes largediameter uncharged holes drilled in the tunnel face In this study, blasting simulations were performed to analyze its 2020年1月10日 DOI: 101002/ese3612 Corpus ID: ; Experimental study and application of medium‐length hole blasting technique in coal‐rock roadway @article{Ding2020ExperimentalSA, title={Experimental study and application of medium‐length hole blasting technique in coal‐rock roadway}, author={Ziwei Ding and Jindui Jia and Xiaofei Li Experimental study and application of medium‐length hole blasting cut blasting is higher, the raise formation is more dicult Therefore, it is necessary to investigate parallel hole cut blasting technology and optimize its technical parameters The key inuencing factors of cut blasting are the cutting method, borehole diameter, hole space, and millisecond delay time [, 67] Cheng et al simulated wedgeOptimization of Borehole Layout in Upwards MediumDeep Hole Cut Blasting2012年5月1日 Experimental Research on Technology of Medium Deep Hole Blasting in Large Inclination Rock Kim et al [15] proposed a controlled blasting method using pilot holes to smooth the smooth fracture Experimental Research on Technology of Medium Deep Hole Blasting
Application of Energy‐Concentrated Hydraulic Blasting
1 Introduction In recent years, the construction of tunnel projects in China has developed rapidly, and the number of tunnels in China accounts for about 50% of the number of tunnels in the world []According to the current data, as of the end of 2020, there are 16,798 railway tunnels in operation in our country, with a total length of about 19,630 km Total operating mileage of 2022年9月14日 Combining numerical simulation and field tests, and comparing and analyzing the blasting effects of singlewedgecutting blasting and inverted Tcut blasting in an extralarge crosssection tunnel, the average blasting hole utilization rate of this blasting method was 902%, the unit explosive consumption was 075 kg/m 3, and the smooth blasting effect was superiorLayout method and numerical simulation study of reducedhole blasting