. Clearing land of rocks for agricultural and other purposes. Explosives in agriculture; Clearing of land. Approximate Number of Pounds of Explosives Required for Shattering Boulders " Snakehole " by Undermine Blasting, per Cubic Yard of Rock, Sandstone, slate and similar soft or more easily broken rock M lb. Limestone and other intermediate rock 1 lb. Marble, granite, trap and similar hard, tough rock 13^2 lt)s. Some blasters may prefer a table based on the diameter of the stones. Such a calculation can be used satisfactorily, but in this case, too, a great deal depends on the shape
. Clearing land of rocks for agricultural and other purposes. Explosives in agriculture; Clearing of land. Approximate Number of Pounds of Explosives Required for Shattering Boulders " Snakehole " by Undermine Blasting, per Cubic Yard of Rock, Sandstone, slate and similar soft or more easily broken rock M lb. Limestone and other intermediate rock 1 lb. Marble, granite, trap and similar hard, tough rock 13^2 lt)s. Some blasters may prefer a table based on the diameter of the stones. Such a calculation can be used satisfactorily, but in this case, too, a great deal depends on the shape of the boulder. Approximate Number of \^i by S inch Sticks of Explosive Required to Shatter Boulders of Different Sizes by Undermine Blast Limestone Sandstone }/2 ft. greatest dia. 1 stick 2 " " \H " 21/2 " " ^V2 ' 3 .. .. \H " 4 '« •• 3-4 " 5 " 6-7 ' and other tough rocks 13^ sticks IM " 2 4-6 " Marble, granite, trap and similar very hard, tough rock 2 sticks 3 If larger sizes are to be broken, better calculate the amount of ex- plosives required by the cubic yard basis. Your figures will be more accurate. When rocks are to be rolled out without shatter- ing, comparatively small charges can be used. The following table will give an idea of the amount of explosive necessary. Approximate Quantity of Explosive Required to Roll Out Buried Boulders dia 14 stick • ?4 .1 .2. l^ft. 2H " 3 " 4 " 5 " Larger sizes than listed require proportionately increased charges. The extent to which the boulder is buried and the nature of the ground also influence the amount of explosive required. Probably the most economical explosive for breaking rock in this way is 30% to 50% strength dynamite or powder of either the nitroglycerin or am- monium nitrate class. On account of the better confine- ment secured in this method, stones can be broken more effecti'^ely and successfully with slower and less power- ful explosives t
Size: 1366px × 1828px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectexplosi, bookyear1918
