Sessional papers of the Dominion of Canada 1909 . of the wall. The minimum width of coping is 12 as no great expense is in-curred and a much increased mass is presented to the bumps of the boats. The thrusts acting upon the wall are:— 1. The thrust tending to overturn the wall: there are 3 cases to be coUEidered :- — (a) Chamber full, and no lock pressure from filling or from water in rear ofwall. (6) Chamber empty and pressure of filling in rear of wall,(c) Chamber empty and pressure of water in rear of wall. 2. The thrust tending to slide the wall upon its base. 3. The crushing at the toe of
Sessional papers of the Dominion of Canada 1909 . of the wall. The minimum width of coping is 12 as no great expense is in-curred and a much increased mass is presented to the bumps of the boats. The thrusts acting upon the wall are:— 1. The thrust tending to overturn the wall: there are 3 cases to be coUEidered :- — (a) Chamber full, and no lock pressure from filling or from water in rear ofwall. (6) Chamber empty and pressure of filling in rear of wall,(c) Chamber empty and pressure of water in rear of wall. 2. The thrust tending to slide the wall upon its base. 3. The crushing at the toe of wall in resisting overturning. 10a—29J 452 DEPARTMENT OF PUBLIC WORKS 8-9 EDWARD Vil., A. 1909CALCULATIONS FOR LOCK CHAMBER WALLS. 1.—Stalnlity Against Overturninf]. (a) Chamber filled and no back pressure from filling or from water in the rearof wall. (8ee fig. 1.) Concrete: = 125 lbs. per cubic foot. Area of wall = 1,500 sq. feet. Weight of wall = 1,500 x 125 lbs. ^. 187,500 lbs. = W Water pressure = 60 x 6% x = 112,500 lbs. = P. \< •/•-- - -*J ^ Chamber Wall 187,500 X 22Factor of safety = -^-g;^^^^^^-=1-8 GEORGIAX BAY SHIP CAXAL SURVEY 45ff SESSIONAL PAPER No. 19a (h) Chamber empty and pressure of filling in roar of wall. (See fig. 2.) Concrete - 125 lbs. per cubic foot. Earth = 100 lbs. per cubic foot. Area = 1,500 sq. feet. Weight = 1,500 X 125 lbs. = 187,500 lbs. = W 56 X 60Area of triangle 1,680 sq. feet. Zi Total weight of triangle = 168,000 lbs. = P The pressure T of the earth, if the earth is assumed as level with the coping and without friction on the back of the wall, is ^ 168,000x32 ^ ^ „ T = - - - ^^ = 89,600 lbs. dO
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