Systematic Drilling and Blasting for Surface Excavations Part 13 doc

... W. H. and Edge, P. M., “Effects of Sonic Boom and Other Shock Waves on Building s,” Minerals Research and Standardsz Nov 1964. 33. Perkins, B., Jr., Lorrain, P. H., and Townsend, W. H., “Forecast- ing ... 1963. Babic, M. M., ‘ Blasting by the BM Method ,“ Mining and Minerals Engineering ~ Apr 1968, pp i9-27. Kochanowsky, B. J., “Theory and Practice of Inclined Drilling for S...

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... Manual 1110-2-3800 Department of the Army U.S. Army Corps of Engineers Washington, DC 20314-1000 EM 1110-2-3800 1 March 1972 Engineering and Design SYSTEMATIC DRILLING AND BLASTING FOR SURFACE EXCAVATIONS Distribution ... Secondary Blasting Coyote Blasting, Trenching, and Cratering Underwater Blasting Underwater Surface Shooting Underwater Blasting in Drill Ho...

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... 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 as well ... second (fps) and in strong rock with little jointing, it will travel as fast as 20,000 fps. P- and S-waves perform work by moving the rock particles Longitudinally and transv...

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... 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...

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... 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 ... was 14,500 fps and in sand- stone was 7,400 fps. Using the relation V=EC the particle velocity v for damage to occur in unlined tunnel...

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... on the density, ingredients (Fig. 3-3), particle size, charge diameter, and degree of confinement. Decreased particle size, increased charge diameter, and increased confinement all tend to increase ... - 140. 150. 160- 170. EXAMPLE KNOWN: CARTRIDGE COUNT 130 KNOWN: CARTRIDGE STRENGTH 40 FINO: WEIGHT STRENGTH (60) 180. 190- 200. 210. Fig. 3-2. Nomograph for comparing weight strength a...

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... 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...

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... 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 -...

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... 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 (...

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... 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...

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