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 ... fuses with loads of 25 or 50 gr/ft will detonate any cap- sensitive explosive and are very useful when blasting with deck charges (para 5- 2c) or when using multiple boosters with...

Ngày tải lên: 11/08/2014, 20:21

... 0.17 2.i 3.8 2 4.7 0.7 17 7.8 3 3.8 1 .5 57 ii .5 4 6.7 2.7 130 15. 5 5 10 .5 4“ 260 19 .5 6 15 6 440 23 7 20 8 700 27 8 27 il i,ioo 3i 9 34 13 4 ,50 0 35 Note: Values are only for an explosive with relative ... 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...

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... veloclty. 3 -5 Conkcal b,t. 4-1 Contracts. 8- 1-8-7 Controlled blasting. 5- 15 Covote blasting. 5- 12 5- 13, 5- 24, 5- 26 Crate ring, 5- 13. 7-17 Crawler drill. 4-11. 4-12 Crl! ical diameter, 3 -5 Crushed ... dimensions and elevations in feet. The drilling and blasting plan is for record purposes only, and will not absolve the Contractor of his responsibility for using...

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... Paragraph 5- 2c 5- 3 5- 3a 5- 3a(i) 5- 3a(2) 5- 3a(3) 5- 3a(4) 5- 3a (5) 5- 3a(6) 5- 3a(7) 5- 3b 5- 3C 5- 3C(I) 5- 3C(2) 5- 4 5- 4a 5- 4a(1) 5- 4a(2) 5- 4a(3) 5- 4a(4) 5- 4b 5- 4C 5- 4d 5- 5 . 5- 5a 5- 5b 5- 5C 6-i 6-2 6-2a 6-2b 6-2c 6-2d 6-3 6-3a 6- 3b 5- 3 5- 4 5- 4 5- 4 5- 5 5- 6 5- 8 5- 11 5- ii 5- 12 5- 12 5- i3 5- 14 5- 14 5- 14 5- 15 5- 15...

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... Type psi psi Coefficient Quartzite 3i, 650 2,5i0 Quartzite 13 22, 250 2 ,55 0 Quartzite 9 43,700 2, 950 i5 Argillite 3i,400 2,620 i2 Diabase 53 ,300 3 ,55 0 15 Basalt 9,800 730 i3 Basalt 26 ,50 0 1,990 i3 Basalt 40,800 4,020 io Gabbro 29,600 2, 150 14 Gabbro 25, 050 i,8i0 14 Granite 24, 350 i,780 ... antici- pated for the future. The drilling and blasting manual for surface...

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... Nitroglycerin Dynamite 60 50 40 30 20 60 50 40 30 20 65 65 65 65 65 65 65 65 65 65 65 65 65 65 60 50 40 30 20 52 45 35 25 15 1.3 19,000 Good :.4 17,000 Fair 1.4 i4,000 Fair 1.4 11 ,50 0 Poor 1.4 9,000 Poor High-Density ... Dynamite, Low-Velocity Series 50 1.2 8,i O0 Fair Fair i20 45 i.i 7,800 Poor Fair 129 40 1.0 7 ,50 0 Poor Fair 1 35 35 i.o 7,200 Poor Fair i...

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... 10,800 li,000-li,800 ii ,50 0-i2 ,50 0 i2,000-i2,800 i2,300-i3, iO0 12 ,50 0 -i3,300 i2,800- 13 ,50 0 i3,000-i3 ,50 0 i3,200-i3 ,50 0 i3,300-i3 ,50 0 0.6- 0.7 1.1- 1.3 2 .5- 3.0 4.4- 5. 2 6.9- 8.2 9.9-ii.7 13.3 - 15. 8 i7.6-20.8 22.0 ... Dynamite Nitroglycerin 12.0 i2.6 i6 .5 16.7 22 .5 Sodium nitrate 57 .3 46.2 37 .5 25. 1 15. 2 Ammonium nitrate ii.8 25. i 31.4 43.1 50 .3 Carbonac...

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... in rotary drilling but higher than 4-i4 EM iiiO-2-3800 I 1 Mar 72 CWPTER ,5. BASIC SURFACE BMTING TECHNIQUES 5- 1. Introduction. a. Rock blasting may be conducted for removal of rock, for con- trol ... leave competent final surfaces. b. This chapter describes preferred blasting techniques used for surface excavations. Information was obtained from CE District offices and p...

Ngày tải lên: 11/08/2014, 20:21

... in 5- i7

Ngày tải lên: 11/08/2014, 20:21

... 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 ... rocks such as sandstone and volcanic rock. Field velocities for granite below the zone affected by surface weathering will average about 15, 000 fps. Velocities in porous rock a...

Ngày tải lên: 11/08/2014, 20:21