Systematic Drilling and Blasting for Surface Excavations Part 11 docx
Systematic Drilling and Blasting for Surface Excavations Part 11 docx
... from
and calculated particle velocities
damage criterio~ for unlined tunnels
explosion is about 20 ips for the
Table 7-1. Strain and Particle Velocity at
Failure for Five Rocks
Dynamic
Particle
Breaking
Propagation
Velocity
Strain
Velocity
at ... plotted points in Fig. 7-1
7-2
EM 111 0-2-3800
1 Mar 72
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Systematic Drilling and Blasting for Surface Excavations Part 1 docx
... Engineers
Washington, DC 20314-1000
EM 111 0-2-3800
1 March 1972
Engineering and Design
SYSTEMATIC DRILLING AND BLASTING
FOR SURFACE EXCAVATIONS
Distribution Restriction Statement
Approved for public release; distribution ...
Presplitting Horizontal and Vertical
Corners
Horizontal Presplitting :
Smooth Blasting
Line Drilling and Close Drilling
Precautions in...
Systematic Drilling and Blasting for Surface Excavations Part 2 docx
... antici-
pated for the future.
The drilling and blasting manual for surface exca-
vations is the first of this series.
Selected references that describe
drilling and blasting procedures and results ... cavity.
2-3
EM 111 0-2-3800
1 Mar 72
Standard Storage Magazines, i957, Pamphlet #
Safety in the Handling and Use of Explosives, 1960, Pamphlet i7
How to Destroy Explosives...
Systematic Drilling and Blasting for Surface Excavations Part 6 docx
... Mar 72
CWPTER,5. BASIC SURFACE BMTING TECHNIQUES
5-1. Introduction.
a. Rock blasting may be conducted for removal of rock, for con-
trol of excavated rock surfaces, and for control of blasted ... techniques used for
surface excavations. Information was obtained from CE District
offices and projects supplemented in
less familiar procedures by references
8 and 14.
5-2. Bla...
Systematic Drilling and Blasting for Surface Excavations Part 3 ppsx
... 80
CARTRIDGE STRENGTH,
percent
Fig. 3-5.
Average confined velocity and specific gr~vity and
calculated detonation pressure of explosives
3-8
E,M 111 0-2-3800
i Mar 72
Table 3-2.
Properties(i) of Dynamites
Weight
Cartridge
Confined
Strength ... Dynamite
i.3
12,500
Fair
1.3
ii,500
Fair
1.3
10,500
Fair
1.3
9,000
Fair
1.3
8,000 Fair
Poor
Poor
Poor
Poor
Poor
Good
Good
Good
Good
Good
i06
i 04...
Systematic Drilling and Blasting for Surface Excavations Part 4 ppsx
... largely
replaced dynamites and gelatins in bench blasting. Denser slurry
blasting agents are supplanting dynamite and gelatin and dry blasting
agents.
3-16
E,M ili O-2-3800
i Mar 72
.
excavation blasting in ... will disperse relatively
rapidly and uniformly.
(4) Inadequate priming imparts a low initial detonation velocity to
a blasting agent, and the reaction may die out a...
Systematic Drilling and Blasting for Surface Excavations Part 5 ppt
... The marked insensitivity to external shock and friction makes
a detonating fuse ideal for both down lines and trunk lines for primary
blasting. Since the blasting cap need not be connected into ... 72
SOFT ROCK BIT -FOR CLAY,
SHALE, SALT, GYPSUM, CHALK,
AN HYORITE, AND MEDIUM LIME
ROCK.
MEDIUM ROCK BIT - FOR LIME-
STONE, DOLOMITE, HARD SHALE,
AND AN HYDRITE.
HARD ROCK BIT -...
Systematic Drilling and Blasting for Surface Excavations Part 7 ppt
... retain gases and reduce
noise and flyrock.
Table 5-1.
Charge Concentration of Inclined Holes
(i)
for
Single-Row Bench Blasting for Fragmentation with Respect
to Various Burdens and Hole Diameters ... airblast, and breakage with a drop ball is pre-
ferred wherever that equipment is adequate and available.
b. Coyote Blasting, Trenching, and Crate ring.
(1) Coyote blasting (...
Systematic Drilling and Blasting for Surface Excavations Part 8 potx
... the bottom and for close hole spac-
ing should be much less.
(2) Relation to Main Blast. Presplitting and primary blasting
are sometimes performed in one operation with the presplit and pri-
mary ... iiiO-2-3800
i Mar 72
Table 5-3. Some Typical Hole Spacings and Diameters,
Charge Concentrations, and Burdens for Smooth
Blasting (after Langefors and Kihlstr6m14)
Drill Hole
C...
Systematic Drilling and Blasting for Surface Excavations Part 9 potx
... heav-
ing effect for loosening and moving material.
(2) Presplit blasting for a finished rock surface may be more
difficult in highly fractured rock depending partly on the nature and atti-
tude ... compressive and tensile
strengths for a selected group of rocks with divergent properties.
(2) Fig. 6-2 is an empirical chart useful for estimating blasthole
spacing and size...
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