Find the magnitude of the lateral earth forces P o per unit length of the wall and find the location z ¯ of the resultant measured from the bottom of the wall.

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Chapter 13, Problem 13.3P

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Find the magnitude of the lateral earth forces Po per unit length of the wall and find the location z¯ of the resultant measured from the bottom of the wall.

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13.1 Figure 13.9 shows a retaining wall that is restrained from yielding. Determine the magnitude of the lateral earth force per unit length of the wall. Also, state the location of the resultant, z, measured from the bottom of the wall. If H = 7m, Ø' = 38°,y = 17 kN/m³,0CR = 2.5 Unit weight = y (or density = c' = 0 8' (angle of wall friction) = 0 Figure 13.9 Ans. P. kN 281.55 Z = 2.33m m.

13.22 Consider the retaining wall shown in Figure 13.38. The height of the wall is 9.75m. and the unit weight of the sand backfill is 18.7kN/m3. Using Coulomb's equation, calculate the active force, Pa, on the wall for the following values of the angle of wall friction. Also, comment on the direction and location of the resultant.

Prob. 1, 2, 3. 13.13 through 13.15 A retaining wall is shown in Figure 13.37. For each problem, determine the Rankine active force, P.r per unit length of the wall and the location of the resultant. Problem H H, Y2 o' (deg) o' (deg) 13.13 4.3 m 2.1 m 16.2 kN/m 19.9 kN/m³ 28 28 19.1 kN/m 12 kN/m? 21 kN/m² 13.14 7.3 m 3 m 18 kN/m? 32 32 13.15 9 m 16.5 kN/m 20.2 kN/m³ 4 m 30 34 Surcharge = q Sand cj = 0 Groundwater table H Sand Y2 (saturated unit weight) cz = 0 Frictionless wall Figure 13.37 Cengage Learning 2014 © Cengage Leaming 2014