Principles of Foundation Engineering
9th Edition
ISBN: 9780357684832
Author: Das
Publisher: Cengage Learning US
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Chapter 16, Problem 16.14P
To determine
Draw the variation of the horizontal earth pressures on the wall.
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QUESTION 4
Compute the hydrostatic force acting on surface ABC exerted by water. Given
wall width as 2 m.
Figure 2
1.5 m
2 m
2.5 m
The wall thickness is
10 mm. Determine the second moments of
area T., and with respect to centroidal
x' and y' axes. In addition, determine the radii
of gyration K., K., and K.
100 mm
-200 mm
-200 mm
100 mm
100 mm
100 mm
X
Refer to the Coulumb Active Earth Pressure. Given alpha = 10 degree; Beta=85 degrees;H - 4m;unit weight of soil = 15 kN/m^3; soil friction angle = 30 degree; and sigma=15 degrees. Estimate the active force, Pa, per unit length of the wall. Also, state the direction and location of the resultant force, Pa.
Chapter 16 Solutions
Principles of Foundation Engineering
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- Consider a retaining wall supporting a fill-soil as shown in the figure. The wall is moving from right to left. q=15kN.m2 0.5m Yconcrete=24kN.m Y1=16KN.m 01=32° Cz=0 3.5m P1 n=16KN.m P2 01=32° 0.5m C==0 [0.5m. 1m 1m 1m (a) Compute the active force P, and on the wall and its location. (b) Compute the passive force P2 on the wall. (c) Analyze the factor of safety against sliding.arrow_forwardDetermine the resultant active lateral earth force acting on of the wall shown and its location. 10 2. $= 40° ム0m a, a, = 0.0arrow_forward-2 ft 10 kip 4 in. B B 1.5 ft-- 4 in. 6 in. ● 4 kip 0.5 ft 2 ft- - Change the magnitude of 10 kip to 7.9 kip - Change the outer width of the cross section from 6 in to 8 in - Keep the wall thickness 1 in (example, instead of 4 inches, the inner width of the cross section is equal to the outer width minus 2 inches). - Determine the maximum in-plane shear stress in the box beam at point A. Show the results on an element located at this point - Determine the principal stresses in the box beam at point B. Show the results on an element located at this pointarrow_forward
- For the R. Wall shown below, Draw the pressure diagram on the wall in an active pressure condition, and find the resultant Force on the wall and its location. The surcharge q = 2400 lb/ft? q = 2500 Ib/ft? w.t. c = 0 Y - 115 pef 10 H = 20° þ = 30° Y = 125 pef 10 o = 40oarrow_forward3m R=1.2m 4m R=1.2m Find the length of given figure above All dimensions Are c/c Wall thickness=0.4m Solve by Centerline method and Long wall- Short wall Methodarrow_forwardA 3.5m x 3.5m square plate was immersed in water such that two of its edges were vertical. In order for the center of pressure to be 80 mm from the center of gravity. a. How far below the water surface is the upper edge of the said plate? b. What is the distance of the center of the pressure from the free water surface? c. Determine the Hydrostatic force in kN acting on the plate.arrow_forward
- A rectangular plane, 1.2 m by 1.8 m is submerged in water and makes qn angle of 30° with the horizontal, the 1.2 m sides being the horizontal. a. what is the minimum lressure acting on the plane in kPa b. what is the maximum lressure acting on the plane kPa c. Determine the magnitude of hydrostatic force acting on either side of the plane in KN. Support your computations with correctly drawn and labrled pressure prism diagrams.arrow_forwardDetermine I, for the thin-walled sections shown in Figures 8.9(a) to 8.9(c), where the wall thicknesses are 0.01 m. 8.5 Dimensions are in metres. I second moment of area about a horizontal axis passing through the centroid. NB 0.15 02 0.15 0.1 (a) (b) (c) Figure 8.9 Thin-walled sections.arrow_forwardb ... oil d water A vertical rectangular plate is submerged half in oil (SG = 0.83) and half in water as shown. Determine the ratio of force exerted by water to that of oil. A 3.25 B) 3.21 C) No answer among the choices D) 3.29 E) 3.16arrow_forward
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