Systematic Drilling and Blasting for Surface Excavations Part 1 docx

... No. 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-io 4 -11 4 -12 4 -13 ,4 -14 5 -1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 5-1o 5-ii 5 -12 5 -13 5 -14 5 -15 5 -16 5 -17 5 -18 5 -19 m 4-2 4-3 4-5 4-6 4-7 4-7 4-9 4-io 4-1o 4 -11 4-i2 4 -13 4 -14 5 -1 5-2 5-2 5-3 5-5 5-6 5-7’ 5-7 5-8 5-9 5-9 5 -10 5-40 5 -12 5 -13 5 -14 5-i6 5 -17 5 -18 vi CECW-EG Engineer ... No. 4-2 4-3 4-4 4-5 4-6 4-7 4-8...

Ngày tải lên: 11/08/2014, 20:21

... cavity. 2-3 EM 11 10-2-3800 1 Mar 72 Standard Storage Magazines, i957, Pamphlet # Safety in the Handling and Use of Explosives, 19 60, Pamphlet i7 How to Destroy Explosives, Pamphlet 21 Rules for Storing, ... 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 a...

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... 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 ... steel assembly for surface ham- mer drills (figures show drive- on and threaded connections)9 ) TYPICAL STEEL AND SIT ASSEMBLY Fig. 4-i O. Bits for down- the- hole hamme...

Ngày tải lên: 11/08/2014, 20:21

... 7 -1 7-2 EM 11 10-2-3800 1 Mar 72 !. I .0 t 11 111 I I o. I 0. 01 0.0 01 0.00 01 0 8 A I I I Ill Oomoge criterion v. 2.0 in/see Bureou of Minesm Longeforsa5 Edwords ond Northwood * J I 1 I I 1 f 1 1[ I ... Minesm Major bngefors et ●t.= damage ● Edwards and Norttnvood3 data Bureau of Mines } Minor Langeforset al. damage Edwards and Northwood data I I 1 t I 1 I 1 t 1...

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... 04 ioo 10 0 ioo 11 0 iio 11 0 11 0 11 0 Low-Density Ammonia Dynamite, High-Velocity Series 50 1. 2 44,000 Fair Fair 12 0 45 1. 1 10 ,400 Fair Fair 12 9 40 4.0 10 ,000 Fair Fair f35 35 1. 0 9,800 Fair Fair 14 i 30 0.9 9,400 ... 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...

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... .2 12 ,000 Very good Very good :: 40 1. 1 11 ,500 Good Very good 63 30 0.9 10 ,500 Fair Very good 11 0 10 5 ioi 98 95 92 88 85 10 6 10 2 ioo 97 92 90 11 0 11 8 13 0 15 0 Note: Values shown are the averages ... nitrate 57.3 46.2 37.5 25 .1 15.2 Ammonium nitrate ii.8 25. i 31. 4 43 .1 50.3 Carbonaceous fuel io.z 8.8 9.2 10 .0 8.6 Sulfur 6.7 5.4 3.6 3.4 i.6 Antacid 1. 2 i.i...

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... Bits of this general type are available in sizes from 1- through 26-in. diameters and are used to drill soft formations 4-7 EM 11 10-2-3800 1 Mar 72 . Fig. 4-4. Track-mounted rotary drill (9-in. ... ROCK. vERY HARD ROCK BIT - FOR CHERT, QUA RTZITE, GRANITE, AND eASALT. Fig. 4-5. Roller bits used in quarrying rock of different hardness9 4-6 EM 411 0-2-3800 1 Mar 72 3C x- 2C 15 5...

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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 13 0 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 ... retain gases and reduce noise and flyrock. Table 5 -1. Charge Concentration of Inclined Holes (i) for Single-Row Bench Blasting for Fragmentation with Respe...

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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 ... 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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... conditions”. 5-25 EM 11 10-2-3800 1 Mar 72 Iw 13 0 12 0 11 0 10 0 90 80 70 60 . . . . . x T= 1. 90n +45.4 T / 0 m / 8x ● # m SONIC VELOCITY RECIPROCAL OF TRAVEL TIME Is /1 1 I 1 I o 10 20 30 40 so 60 ABSOLUTE ... about 15 ,000 fps. Velocities in porous rock and medium hard to hard shales are of the order of 7,000 to 10 ,000 fps. (2) A zcne of mechanical and ckl~mica] weath...

Ngày tải lên: 11/08/2014, 20:21