ويركزمعهد بحوثالعامة لليمينغ الصناعة الثقيلةفي مجال البحوث وتطوير التكنولوجيا المتقدمة والمنتجات الموجهة لصالح العملاء، فضلا عن بناءالقدرة التنافسية الجوهريةليجعل يمينغالصناعة الثقيلةرائدةفي هذه الصناعة.من خلال توفيرنتائج البحوثالأساسية، ويدعم المعهديمينغالصناعة الثقيلةالتكنولوجيا والمنتجات لتكون أعلىمنهافي العالمالقائمة.
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Comparison of Blast-Induced Damage Between Presplit
2017-8-23 smooth blasting and presplit blasting excavation methods are widely used in the contour excavation of high rock slope. The excavation sequence of these two methods is illustrated in Fig. 2. (The rows of production blasting depend on the project circumstances; in the present study, two rows was chosen as an example.)
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ComparisonofPresplitandSmoothBlastingMethodsfor ...
2019-1-20 To minimize and reduce these problems, presplit and smooth blasting as the advanced control techniqueshavebeenwidelyintroducedintoblastingdesign [11–13].Intheblastdesignofrockwellsortunnels,presplit and smooth blasting both need to drill a circle of small spacingboreholesalongthedesignedcontourline,as
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Comparison of Presplit and Smooth Blasting Methods
2019-1-1 To understand differences of smooth and presplit blasting for the excavation of rock wells, two field experiments using these two techniques are implemented... DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
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[PDF] Comparison of Presplit and Smooth Blasting
To understand differences of smooth and presplit blasting for the excavation of rock wells, two field experiments using these two techniques are implemented at the same test site, respectively. The ground vibrations induced by them have been monitored with the different distances through the corresponding devices. The vibration results illustrate that at the same monitoring distance and ...
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Comparison of Blast-Induced Damage Between
2013-9-14 Comparing the presplit blasting and smooth blasting holes, they have similar charge structures and blasting parameters, so the peak value and rise time of the blasting load are almost the same. However, the burden of presplit blasting is much greater than that of smooth blasting
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Numerical and experimental investigation of blasting ...
An optimized method of presplit-smooth blasting was proposed and verified with numerical simulations. Finally, based on excavation of the Baihetan high rock slope, a comparison of the conventional and optimized approaches was conducted with sonic wave tests and roughness monitoring. The results demonstrate that the presplit-smooth blasting approach inherits the advantages of both presplit and smooth blasting
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Understanding the connection between blasting and
2019-1-1 Presplit blasting involves drilling a single row of holes along the back of the final excavation zone . Unlike smooth wall blasting, the presplit holes are fired on the first delay of the production blast. The presplit technique is the most commonly used controlled blasting technique for surface operations. 3. Methods3.1. Line drilling
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Pre-Split Blast Design For Open-Pit And Underground
PRE-SPLIT DESIGN THEORY Various theories have been put forward over the years regarding the mechanism by which a presplit mine is formed. Most of these theories involve the interaction of the ground vibrations resulting from the detonation of the explosives In the pre-split blast holes.
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A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL
2006-3-22 simultaneously, creating a split between the blasting zone and the proposed sidewalls. Smooth Blasting: The back holes are fired last as usual, relying on a reduced charge mass per hole for overbreak control.
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Comparison of Presplit and Smooth Blasting Methods
2019-1-1 Comparison of Presplit and Smooth Blasting Methods for Excavation of Rock Wells Zilong Zhou, Ruishan Cheng, Xin Cai, Jinlong Jia, Weihua Wang; Affiliations Zilong Zhou School of Resources and Safety Engineering, Central South University, Changsha 410000, China ...
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[PDF] Comparison of Presplit and Smooth Blasting
To understand differences of smooth and presplit blasting for the excavation of rock wells, two field experiments using these two techniques are implemented at the same test site, respectively. The ground vibrations induced by them have been monitored with the different distances through the corresponding devices. The vibration results illustrate that at the same monitoring distance and ...
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smooth blasting presplit - Akademia Epsilon
smooth blasting presplit
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smooth blasting presplit in philippines
Rock Fracture and Blasting ScienceDirectKnow More. This chapter describes air deck smooth blasting and presplit methods The following topics are discussed in detail principles and parameters of air deck mechanism of decoupled charge effects of air deck and decoupled charge on rock fracture shock wave attenuation in stemming and principles of smooth and presplit blasting...
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Numerical and experimental investigation of blasting ...
The presplit-smooth blasting was verified that it could inherit the advantages of presplit and smooth blasting. Abstract. The disturbance of a rock mass due to blasting impact and stress redistribution can significantly affect the overall performance of an excavation. Crack formation during presplit blasting was analyzed with a mathematical ...
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Comparison of Blast-Induced Damage Between
2013-9-14 This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS
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Pre-Split Blast Design For Open-Pit And Underground
Perimeter blasting techniques limit damage to the final walls of excavations. This is accomplished by lowering the explosive energy concentration of the excavation boundary. The most common method is pre-splitting which involves the formation of a crack coincident with the
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Paper: Improved Blasting and Bench Slope Design at
The detrimental effects of small-scale structures could be controlled through lighter smooth blasting, whereas the impact of larger, more dominant, structures, prevailed even for very light smooth (for open pit operations) blasting. For the footwall, presplit blasting in inclined (70°) holes over the full double-bench height, proved to be ...
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A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL
2006-3-22 Smooth Blasting: The back holes are fired last as usual, relying on a reduced charge mass per hole for overbreak control. The South African Institute of Mining and Metallurgy International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering
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Tecniche di abbattimento controllato in una cava a cielo ...
2018-11-5 POLITECNICO DI TORINO Corso di Laurea Magistrale in Ingegneria Civile Tesi di Laurea Magistrale A.A. 2017/2018 Tecniche di abbattimento controllato in una cava a cielo aperto per l’ottimizzazione della profilatura dei
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... FROM SMOOTH AND PRESPLIT BLASTING ...
To study the effect of smooth and presplit blasting on surrounding rocks in the tunnel excavation,the effect size of this two blasting methods on surrounding rocks was analyzed by using the technology of monitoring blasting vibration,spectrum analysis and ultrasonic ...
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Comparison of Blast-Induced Damage Between
2013-9-14 This paper focuses on the comparison of damage induced by smooth blasting and presplit blasting based on the excavation of high rock slope. The whole damage process of the smooth blasting and presplit blasting excavation method is studied by using a cumulative blasting damage numerical simulation technology based on the secondary development of the dynamic finite element code LS
دردشة على الإنترنت Read More -
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Comparison of Presplit and Smooth Blasting Methods
To understand differences of smooth and presplit blasting for the excavation of rock wells, two field experiments using these two techniques are implemented at the same test site, respectively. The ground vibrations induced by them have been monitored with the
دردشة على الإنترنت Read More -
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smooth blasting presplit in philippines
Rock Fracture and Blasting ScienceDirectKnow More. This chapter describes air deck smooth blasting and presplit methods The following topics are discussed in detail principles and parameters of air deck mechanism of decoupled charge effects of air deck and decoupled charge on rock fracture shock wave attenuation in stemming and principles of smooth and presplit blasting...
دردشة على الإنترنت Read More -
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Pre-Split Techniques: A Review Agg-Net
2021-5-29 Pre-splitting can be defined as ‘a technique using lightly charged, closely spaced holes to induce a fracture plane along a required design profile, which isolates the rock to be blasted from the surrounding rock mass’. The holes are generally fired instantaneously well in advance of any blasting in the adjacent rock.
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Paper: Improved Blasting and Bench Slope Design at
The detrimental effects of small-scale structures could be controlled through lighter smooth blasting, whereas the impact of larger, more dominant, structures, prevailed even for very light smooth (for open pit operations) blasting. For the footwall, presplit blasting in inclined (70°) holes over the full double-bench height, proved to be ...
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Explosives Engineers’ Guide
2020-4-22 Presplit blasting Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock)
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南昌大学 - 建筑工程学院 - 副教授-杨建华
2019-2-26 Comparison of blast induced damage between presplit and smooth blasting of high rock slope. Rock Mechanics and Rock Engineering, 2014, 47(4): 1307-1320. [20] Zhang WJ, Lu WB*, Yang JH, Yan P. Cracking of surrounding rocks induced by excavation
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Tecniche di abbattimento controllato in una cava a cielo ...
2018-11-5 POLITECNICO DI TORINO Corso di Laurea Magistrale in Ingegneria Civile Tesi di Laurea Magistrale A.A. 2017/2018 Tecniche di abbattimento controllato in una cava a cielo aperto per l’ottimizzazione della profilatura dei
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隧道及地下工程光面爆破技术研究现状与展望 - cqu.edu.cn
2013-3-17 隧道及地下工程光面爆破技术研究现状与展望 王建秀 1, 2, 邹宝平 2, 胡力绳 3 1.同济大学岩土与地下工程教育部重点实验室,上海 200092; 2.同济大学地下建筑与工程系, 上海 200092; 3. 中铁二局集团有限公司,成都 610031 Advance and Trend in Smooth ...
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