Systematic Drilling and Blasting for Surface Excavations Part 3 ppsx
Systematic Drilling and Blasting for Surface Excavations Part 3 ppsx
... 20 30 40 50 60 70 80 CARTRIDGE STRENGTH, percent Fig. 3- 5. Average confined velocity and specific gr~vity and calculated detonation pressure of explosives 3- 8 E,M 1110-2 -38 00 i Mar 72 Table 3- 2. Properties(i) ... (60) 180. 190- 200. 210. Fig. 3- 2. Nomograph for comparing weight strength and cartridge strength6 3- 3 EM iiiO-2 -38 00 i Mar 72 (5) Usually dynamites are rated...
Ngày tải lên: 11/08/2014, 20:21
Systematic Drilling and Blasting for Surface Excavations Part 4 ppsx
... 10,800 li,000-li,800 ii,500-i2,500 i2,000-i2,800 i2 ,30 0-i3, iO0 12,500 -i3 ,30 0 i2,800- 13, 500 i3,000-i3,500 i3,200-i3,500 i3 ,30 0-i3,500 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 -26.8 27.2 -32 .6 33 .0 -39 .4 39 .6 ... underwater blasting and in deep well shooting. (2) Straight gelatin has two characteristic detonation velocities, 3- 1...
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Systematic Drilling and Blasting for Surface Excavations Part 1 docx
... 7e 3- 7f 3- 7g 3- 8 3- 8a 3- 8b 3- 8c 4-1 4-2 4 -3 4-3a 4-3b 4-3C 4-3d 4-4 4-5 5-i 5-2 5-2a 5-2b - 3- 10 3- io 3- io 3- 12 3- 13 3- 13 3-i3 3- i6 3- 16 3- 16 3- i7 3- i8 3- 20 3- 20 3- 20 3- 20 3- 20 3- 20 3- 20 3- 20 3- 21 3- 21 3- 22 3- 24 4-i 4-i 4-4 4-4 4-4 4-5 4-5 4-8 4-ii 5-i 5-i 5-1 5 -3 ii EM ... SURFACE BLASTING TECHNIQUES Introduction Blasting P...
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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 ... Type psi psi Coefficient Quartzite 3i,650 2,5i0 Quartzite 13 22,250 2,550 Quartzite 9 43, 700 2,950 i5 Argillite 3i,400 2,620 i2 Diabase 53, 300 3, 550 15 Basalt 9,800 73...
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Systematic Drilling and Blasting for Surface Excavations Part 5 ppt
... (see para i- 3) . Manufacturer’s data should be consulted for current requirements. Because of variation from brand to brand, mixing brands of caps in a round should not be done. (3) A delay element ... sheath enclosed in a reinforcing cover. Reinforcing covers come in a ~riety 3- 22 EM iiiO-2 -38 00 i Mar72 $ rocks is shown iq, Table 4-i. A tendency for manufacturers to improve their...
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Systematic Drilling and Blasting for Surface Excavations Part 6 docx
... iiiO-2 -38 00 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 of excavated rock surfaces, and for control ... 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-...
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Systematic Drilling and Blasting for Surface Excavations Part 7 ppt
... ft 1 0.42 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 4,500 35 Note: Values are only for an explosive ... 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...
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Systematic Drilling and Blasting for Surface Excavations Part 8 potx
... 1/2 0.08 3 0.17 :- 1/2 3- 1/2 ;- 1/2 0. 23 3- 1/2 4- 1/2 3 0 .34 4 5- 1/2 3- 1/2 0.5 4- 1/2 6- 1/2 4 0.6 5- 1/2 7 (Courtesy of Almqvist & Wiksell F~rlag AB) hole diameter. These form a surface ... y2e w2 h0" alt="" EM iiiO-2 -38 00 i Mar 72 Table 5 -3. Some Typical Hole Spacings and Diameters, Charge Concentrations, and Burdens for Smooth Blasting (after Langefors and...
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Systematic Drilling and Blasting for Surface Excavations Part 9 potx
... 165lb/ft3 Massdensity= 165lb/ft3 32 .2ft/sec2 I Characteristicimpedance= 18,200fps (3: :::2) = 93, 300lb aec/ft3 “ I or = 54 lb seclin. 3 Fig. 6-i. Typical impedance calculation for granite (3) Explosives with ... 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 partl...
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Systematic Drilling and Blasting for Surface Excavations Part 10 potx
... Introduction. a. A necessary part of all blasting operations is the estimation of potential damage to nearby surface and underground structures and to local rock surfaces that are to remain in ... be made. c. Methods and techniques for preventing damage by cent rolling the amount of airblast, ground vibration, flyrock, and cracking are gen- erally known and should be made a...
Ngày tải lên: 11/08/2014, 20:21