HW _10_fall-11

HW _10_fall-11 - respect to overturning sliding and bearing...

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CEG 4012 Homework 10 Due Fri Dec 2 nd 2011 Name:_________________________________ Show All Work 1. For the gravity wall shown at right, determine the FS with respect to modes of failure (i.e., Sliding, Overturning, Bearing). The wall is concrete ( γ c = 150 pcf) and consider the base-soil friction to be δ =0.6 φ . The ultimate bearing capacity of the soil is 1.81 ksf. Use the Rankine analysis for active earth pressure. Based on the conventional acceptable FS values, is the wall stable with respect to each mode? 2. For the cantilever wall shown at right, the wall dimensions are H = 4.5 m, x 1 = 0.3 m, x 2 = 0.8 m, x 3 = 2 m, x 4 = 0.8 m, D = 1.5 m. The allowable bearing capacity of the soil is 140 kPa. The soil properties are shown. Determine the FS with

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Unformatted text preview: respect to overturning, sliding, and bearing. Use γ c = 23.58 kN/m 3 as the unit weight of concrete. Use Rankine analysis. 23 ft Sand Backfill γ m =115.0 pcf γ sat = 125.2 pcf φ = 37°, c = 0 i = 10° 5 ft 5 ft 2.5 ft 2.5 ft Bearing Soil γ sat = 122.0 pcf φ = 25°, c = 0 Sand Backfill γ m = 18.8 kN/m 3 φ = 32° Bearing Soil γ sat = 18.8 kN/m 3 φ = 22° c = 17.9 kN/m 2 x 1 x 2 x 3 x 4 D H 3. A gravity wall retains backfill inclined at an angle of 25°. Determine the total resultant force and its point of application using Coulomb’s analysis. Calculate the components of the total resultant force. 20 ft Sand Backfill γ m = 120.0 pcf γ sat = 125.2 pcf φ = 37°, c = 0 i = 25°...
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