Rock Excavation, Methods And Cost
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In our eReader you can find the full English version of the book. Read Rock Excavation, Methods And Cost Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Rock Excavation, Methods And Cost
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F. A. Mahan tells of large blasts used at Genoa, Italy, in 1895. In lime- stone quarry, strata dipping 60° toward face, galleries were driven in the base at right angles to each other, and then the supporting pillars were all blown out at once, under- mining an area 100 x 300 ft., allowing the strata above to slide down. When the strata were twisted so they would not slide, shafts were sunk from the top. One charge of 11,440 lbs. of dynamite produced a land slide of 260,000 cu.
yds. of rock wit...hout damaging surrounding dwellings.
A big blast in granite, at Long Cove, Me., is described briefly in the magazine, Stone (New York), 1896, p. 555, the data being as follows: A 4 x 4 shaft was sunk 64 ft., then two drifts were run, right and left, each being 27 ft.
long; at the end of these drifts cross drifts 26 ft. long were driven, to receive the explosives. Four men were engaged about Syi mos. doing this work. Black powder was charged in waterproof canvas bags, the men working six days in complete darkness.
What to read after Rock Excavation, Methods And Cost?
You can find similar books in the "Read Also" column, or choose other free books by Gillette Halbert Powers to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
F. A. Mahan tells of large blasts used at Genoa, Italy, in 1895. In lime- stone quarry, strata dipping 60° toward face, galleries were driven in the base at right angles to each other, and then the supporting pillars were all blown out at once, under- mining an area 100 x 300 ft., allowing the strata above to slide down. When the strata were twisted so they would not slide, shafts were sunk from the top. One charge of 11,440 lbs. of dynamite produced a land slide of 260,000 cu.
yds. of rock wit...hout damaging surrounding dwellings.
A big blast in granite, at Long Cove, Me., is described briefly in the magazine, Stone (New York), 1896, p. 555, the data being as follows: A 4 x 4 shaft was sunk 64 ft., then two drifts were run, right and left, each being 27 ft.
long; at the end of these drifts cross drifts 26 ft. long were driven, to receive the explosives. Four men were engaged about Syi mos. doing this work. Black powder was charged in waterproof canvas bags, the men working six days in complete darkness.
What to read after Rock Excavation, Methods And Cost?
You can find similar books in the "Read Also" column, or choose other free books by Gillette Halbert Powers to read onlineMoreLess
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