. Proceedings of the annual convention . thod is used for eachcomputation. 3. Determine the average pressures pi, p^, etc., over each distance BC, CD, etc., asindicated in Fig. 3. 4. Determine the elevation of the centroid of this approximate pressure diagram. Thisis the approximate elevation of the point of application of the resultant earthpressure P. If the backfill may be considered cohesionless, the point of application of pressuremay be obtained as follows:a. Determine the center of gravity of the earth and ballast in the wedge between the plane of rupture and the vertical plane passing
. Proceedings of the annual convention . thod is used for eachcomputation. 3. Determine the average pressures pi, p^, etc., over each distance BC, CD, etc., asindicated in Fig. 3. 4. Determine the elevation of the centroid of this approximate pressure diagram. Thisis the approximate elevation of the point of application of the resultant earthpressure P. If the backfill may be considered cohesionless, the point of application of pressuremay be obtained as follows:a. Determine the center of gravity of the earth and ballast in the wedge between the plane of rupture and the vertical plane passing through the heel of the wall (Chart 1) or the back of the wall (Chart 2), Fig. 3. 810 Masonry Assume the center of gravity of the surcharge loads to be located at the surface ofthe backfill. Determine the center of gravity of the combined loads and draw a line from thispoint parallel to the plane of rupture to a point of intersection with the vertical planethrough the heel of the wall (Chart 1) or the back of the wall (Chart 2), Fig. Unit Pressures ^4 = 143 psf %-- 511 P = R-Pf: 695 R = P-R . 920 Scale: \z 10 w=Unif weight of soil = 120 pcf c = Cohesion per unit of areo = 200 psf (Should usuolly be neglected) ^ 4 :Angle of internol friction of soil = 30«■ = Slope of backfillf =Direction of P *^-^fan(45%|-) = VECTORSAreo rwt. Sur- Tofol Wtchg. (Kips)0 WEDGEWedge Areo 1 X 1+*7= 2 2423|*577x5= | 23 8 25 3 3 38 5 4 45 3 6 5 COHESIONWedge Length VECTORSCohesion (Kips) 65 TRIAL WEDGEEARTH PRESSURE METHODCOMPUTATIONS
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