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Problem 4. (20 points) Figure 11.11 illustrates the notation and sign conventions for the Mononobe-Okabe extension of the Coulomb analysis of dynamic loading on a retaining wall. Consider a vertical retaining wall 7 m high with horizontal backfill. Assume that, for the soil, Mass density p = 1.9 Mg/m3 Cohesion c = 0 Friction angle o = 36 Friction angle between soil and wall 8 = 18° Assume the horizontal seismic loading coefficient kn = 0.20 and the vertical coefficient is 0. Calculate the active load P that the soil exerts on the wall due to the combination of static and seismic effects.
1 Clay Sand Equation (11.43c) 0.8 Ø' = 30° D O 3 0.6 Konc 2 '=40° CITO JEON 1 OT 0.4 Clay Silt 0.2 | • Sand A Gravel - Equation (11.43a) 0 0 10 20 30 (degrees) 0 40 50 1 100 10 OCR Figure 11.11 Estimation of K, from © and OCR, and comparison to in-situ test data.