Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 | Page 4

| 110-130 | 55 | 79-106 | 4 | +---------+---------+---------+----------+---------+
+---------+--------------------+-----------------------------+ | | Per Cubic Yard | Per linear Foot of Tunnel | | +---------+----------+-------+---------+-----------+ | | Linear | Pounds | Cubic | No. of | Pounds | | | Feet | of | Yards | Feet | of | | | Drilled | Dynamite | | Drilled | Dynamite | +---------+---------+----------+-------+---------+-----------+ | Heading | 5.4-6.0 | 3.9-5.0 | 5.3 |28 to 32.| 20.7-26.5 | +---------+---------+----------+-------+---------+-----------+ | Bench | 2.-2.4 | 1.4-2.0 | 13.7 | 27.-33. | 19.2-27.4 | +---------+---------+----------+-------+---------+-----------+ | Total | 19 | 55.-65. | 39.9-53.9 | +------------------------------+-------+---------+-----------+ | Per cubic yard, whole tunnel section | 2.9-3.4 | 2.1-2.8 | +--------------------------------------+---------+-----------+
+---------------------------------------------------+------------+ | | Number | | Blasting Notes: | of Sticks | | +------------+ | Heading: First Round; 2 to 3 relieving holes | | | sprung with 4 to 5 sticks each | 8 to 15 | | 8 cut holes, 7 sticks each | | | (sometimes shot twice) | 56 to 112 | | First side round, 6 holes, 6 sticks | | | each | 36 | | Widening and dry holes, 10 to 12, | | | 6 sticks each | 60 to 72 | | +------------+ | Total Sticks | 160 to 235 | | +------------+ | Total Pounds | 134 to 196 | | ----------------+------------+ | Sub-bench: 8 holes, 4 to 6 sticks, each | 32 to 48 | | | | | Bench: 8 holes, 6 to 8 sticks, each | 46 to 64 | | Taking up bottom, average | 15 | | +------------+ | Total Sticks | 95 to 127 | | +------------+ | Total Pounds | 79 to 109 | +---------------------------------------------------+------------+

[Illustration: Fig. 3. CROSS-SECTION, LONGITUDINAL SECTION, PLAN]
Drilling Method No. 3: Heading same as second method, but larger lift taken off bench, and lift holes drilled in bottom bench in order to get down to grade in floor. Bench kept closer to heading.
+---------------------------------------------------------+ | Per Round | +---------+------------+-----------+------------+---------+ | | Total | No. of | Pounds | | | | Depth | Cubic | of | Advance | | | Drilled | Yards | Dynamite | | +---------+------------+-----------+------------+---------+ | Heading | 190 to 220 | 35 to 42 | 134 to 196 | 6? to 8 | +---------+------------+-----------+------------+---------+ | | | | | | | Bench | 145 " 190 | 90 to 110 | 118 " 167 | 6? " 8 | +---------+------------+-----------+------------+---------+
+-----+-------------------------+----------------------------------+ | | Per Cubic Yard | Per linear Foot of Tunnel | | +------------+------------+-------+-----------+--------------+ | | Linear | Pounds | Cubic | No. of | Pounds | | | Feet | of | Yards | Feet | of | | | Drilled | Dynamite | | Drilled | Dynamite | +-----+------------+------------+-------+-----------+--------------+ | Hd. | 5.4 to 6.0 | 3.9 to 5.0 | 5.3 | 28 to 32 | 20.7 to 26.5 | +-----+------------+------------+-------+-----------+--------------+ | B. | 1.6 " 1.9 | 1.3 " 1.8 | 13.7 | 22 " 36 | 17.8 " 24.7 | +-----+------------+------------+-------+-----------+--------------+ | Total | 19 | 50 " 58 | 38.5 " 51.2 | +-------------------------------+-------+-----------+--------------+ | Per cubic yard, whole tunnel section | 2.6 " 3.1 | 2.0 " 2.6 | +---------------------------------------+-----------+--------------+
+---------------------------------------------------+------------+ | | Number | | Blasting Notes: | of Sticks | | +------------+ | Heading: First Round: 2 to 3 relieving holes | | | sprung, with 4 to 5 sticks each | 8 to 15 | | 8 cut holes, 7 sticks each | | | (sometimes shot twice) | 56 to 112 | | First side round, 6 holes, 6 sticks | | | each | 36 | | Widening and dry holes, 10 to 12 holes, | | | 6 sticks each | 60 to 72 | +---------------------------------------------------+------------+ | Total Sticks | 160 to 235 | +---------------------------------------------------+------------+ | Total Pounds | 134 to 196 | +---------------------------------------------------+------------+ | | | | Sub-bench: 4 widening holes, 4 to 5 sticks each, | | | 2 rounds | 32 to 40 | | 6 down holes, 5 to 7 sticks each, | | | 2 rounds | 60 to 84 | | | | | Bench: 4 down holes, 5 to 7 sticks each | 20 to 28 | | 6 to 8 lift holes, 5 to 6 sticks each | 30 to 48 | +---------------------------------------------------+------------+ | Total Sticks | 142 to 200 | +---------------------------------------------------+------------+ | Total Pounds | 118 to 167 | +---------------------------------------------------+------------+
[Illustration: Fig. 4. CROSS-SECTION, LONGITUDINAL SECTION, PLAN]
Drilling Method No. 4: 8 drills on 4 columns used in heading. Bench taken off in one lift. Bottom taken up with lift holes.
+--------------------------------------------------+ | Per Round | +---------+---------+---------+----------+---------+ | | Total | No. of | Pounds | | | | Depth | Cubic | of | Advance | | | Drilled | Yards | Dynamite | | +---------+---------+---------+----------+---------+ |