Results 231 to 240 of about 14,170 (290)

Blast vibration monitoring of rock excavations

Canadian Geotechnical Journal, 1977
Vibration monitoring of blasting for rock excavation has been undertaken at a number of large hydroelectric and other construction sites in Canada. This paper presents the relationships between vibration measurements and intensity of blasting at different project sites.
L. D. Keil, A. S. Burgess, N. M. Nielsen, A. Koropatnick   +3 more
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Numerical study of rock fracturing during blasting excavation

2010 International Conference on Mechanic Automation and Control Engineering, 2010
During the process of excavations, blasting can induce damage inside surrounding rock, which may change the mechanical properties of rock mass and influence the stability of structure. Considering the effects of material properties and loading conditions, two numerical models, a rock blasting excavation model with two excavation steps and a planar rock
null Zhangtao Zhou, null Zheming Zhu, null XinXing Jin, null Hao Tang, null Yuan Wang   +4 more
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Small Spacing Tunnels the Blasting Excavation Dynamic Effect

Applied Mechanics and Materials, 2013
Kinetic research of Small spacing tunnel blasting excavation is always the hot issue both at home and abroad. In this paper, the entrance section of a small spacing tunnel is chose as an example, the Explicit dynamic finite element model and the Euler method is adopted to accurately simulate the process of blasting vibration, and the peak vibration ...
You Mo, Bin Teng, Zu Yin Zou, Lin Li, Mei Zhong   +4 more
openaire   +1 more source

An investigation into blasting design for mining excavations

Mining Science and Technology, 1988
Abstract Blastability of rock is defined utilizing Bieniawski's rock mass classification with Hoek and Brown m and s values. A new method is introduced to determine optimum blasthole diameter, burden, spacing, stemming length, ratio of maximum burden to the bench height and relationship between the blastability, rock strength factor and specific ...
A. Afrouz, F.P. Hassani, R. Ucar
openaire   +1 more source

Non-blasting Excavation

2016
As the restriction of the surrounding conditions, non-blasting method of rock excavation have to be use. Different kinds of non-blasting methods for rock excavation are introduced in this chapter.
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Blasting Design for Underground Excavation

2016
In this chapter, blasting designs for tunnels and shafts, including drillholes patters, explosive charging calculation and firing sequences are illustrated in detail. As the case studies, the usage of electronic detonators for tunnel blasting are introduced.
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Contour Blasting for Underground Excavation

2016
For reducing the damage to surrounding rock beyond the excavation profile and also achieving a relative smooth surface of the roof and walls, smooth blasting as the main contour blasting technique is usually used in underground excavations. The characters of smooth blasting, Charge calculation and charging methods are introduced in this chapter.
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Contour Blasting Technique for Surface Excavation

2016
Contour blasting is also called controlled blasting as its main purpose is to minimize the damage to the rock (overbreak) beyond the boundary of the designed contour of the excavation. Varies of contour blasting techniques and their mechanism, contour blasting design and working methods are illustrated in this chapter.
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Influence Research of Underground Caverns Blasting Excavation on Excavation Damage Zone of Adjacent Cavern

Advanced Materials Research, 2013
The influence of the single cavern blasting excavation in underground caverns on the stability of surrounding rock of adjacent caverns can not be ignored.In–situ blasting vibration test and dynamic finite element analysis were used to study the laws of blasting seismic wave propagation, two different material constitutive models were adopted, compared ...
Peng Cheng Xu, Qian Dong, Xin Ping Li, Yi Luo   +3 more
openaire   +1 more source