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 ,25 0 2, 550 Quartzite 9 43,700 2, 950 i5 Argillite 3i,400 2, 620 i2 Diabase 53,300 3,550 15 Basalt 9,80...

Ngày tải lên: 11/08/2014, 20:21

... 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 ... one form of blasting log kept by contractor Record of blasting required by one CE Di...

Ngày tải lên: 11/08/2014, 20:21

... 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 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...

Ngày tải lên: 11/08/2014, 20:21

... lb/ft5 or 4.3, and c = 15,000 fps, 32. 2 ft/sec2 then v = 16 ips. Thus, an estimated safe vibration level for concrete structures would be about iO ips. ( 12) AS the safe vibration levels for underground ... velocities, for failure. Based on these data, a subjected to ground vibration from and calculated particle velocities damage criterio~ for unlined tunnels explosion is about...

Ngày tải lên: 11/08/2014, 20:21

... (60) 180. 190- 20 0. 21 0. Fig. 3 -2. Nomograph for comparing weight strength and cartridge strength6 3-3 EM iiiO -2- 3800 i Mar 72 (5) Usually dynamites are rated on weight strength and gelatins on ... Low-Velocity Series 50 1 .2 8,i O0 Fair Fair i20 45 i.i 7,800 Poor Fair 129 40 1.0 7,500 Poor Fair 135 35 i.o 7 ,20 0 Poor Fair i4i 30 0.9 6,900 Poor Fair i53 25 0.9 6,500 Poor F...

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... 53.3 45.5 34.4 22 .6 Carbonaceous fuel i5.4 13.7 i3.8 14.6 18 .2 Sulfur 2. 9 2. 0 Antacid 1.3 i.o i.1 1 .2 Moisture 0.9 1.0 ::! 0.9 1 .2 High- Density Ammonia Dynamite Nitroglycerin 12. 0 i2.6 i6.5 16.7 22 .5 ... . i2 7,000- 9,000 8,500- 9,900 i0,000- 10,800 li,000-li,800 ii,500-i2,500 i2,000-i2,800 i2,300-i3, iO0 12, 500 -i3,300 i2,800- 13,500 i3,000-i3,500 i3 ,20 0-i3,500 i3,3...

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... hardness9 4-6 EM 4110 -2- 3800 1 Mar 72 3C x- 2C 15 5 o 0 0 0 0 o 0 0 Oo 0 0 0 0 e o 0 e o 00 0 0 0 0 4 020 00 * o 0 0 0° 0 0 %.O 00 0 0° 00 0 0 0 0 0 0 0 a 00 0 0 8oe o I 1 1 I D 2. 2 2. 4 26 2. 8 DRY BULK ... sheath enclosed in a reinforcing cover. Reinforcing covers come in a ~riety 3 -22 EM iiiO -2- 3800 i Mar 72 $ rocks is shown iq, Table 4-i. A tendency for manufacturers to imp...

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... lb/ft lb/ft lb 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“ 26 0 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 ... strength blasting gelatin = 1 .27 and ANFO = 0.87. (i) Slope is 2 to 3 vertical to i horizontal. = 1 of (6) Subdrilling. Blastholes are usually subdrille...

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... berm) in. lb/ft ft ft i- 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 ... class="bi x0 y2e w2 h0" alt="" EM iiiO -2- 3800 i Mar 72 Table 5-3. Some Typical Hole Spacings and Diameters, Charge Concentrations, and Bu...

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... Type fps lb/see/in. f Granite i8 ,20 0 54 Marlstone ii,500 27 Sandstone 10,600 26 Chalk 9,100 22 Shale 6,400 i5 and, therefore, good coupling possibilities. 47) and granite (impedance 54) also suggest plosive ... 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 par...

Ngày tải lên: 11/08/2014, 20:21