= 1. Using the trial wedge approach, calculate the active force resultant, EATW, acting on the vertical wall (6 = 0) sho

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1 Using The Trial Wedge Approach Calculate The Active Force Resultant Eatw Acting On The Vertical Wall 6 0 Sho 1 (102.25 KiB) Viewed 71 times

= 1. Using the trial wedge approach, calculate the active force resultant, EATW, acting on the vertical wall (6 = 0) shown below. The surcharge, q, acts only over a length L = 5.2 m, as shown. State both the magnitude of the maximum active force E TW and the associated inclination angle, 8, of the failure plane. Show supporting calculations. H= 9 m 9 = 16.8 kN/m2 Yamarin = Y = 18.9 kN/m '=320 -- d' = 0 4.5 m 8 = 20° Y = 9.81 kN/m 2. A wall that supports an excavation of 70 ft is to be constructed in the soil profile shown below. Calculate the resultant total force, R=EA + Pw, on a perfectly smooth (frictionless and adhesionless, c. = 8 = 0) vertical wall for the following cases (note, yw = 62.4 lb/ft?): a) Trial wedge approach (EATW): Do only one trial with failure surfaces inclined at 8 = 45 ++'/2 within each soil strata (i.e. no trial and error required!). Assume also that all vertical inter-block surfaces are perfectly smooth. b) Rankine approach (ER): In addition to calculating pa(z) and u, plot graphs of active earth pressure, water pressure, and total lateral pressure versus depth (plot graphs side- by-side on equal depth axes (y axis positive going downwards, like in the class notes). Depth (ft) 0 5A 1 ------ Beach SAND 10 d' = 35° c'=0 - Yout=y=125 pcf 20 - Med, to stiff CLAY Ya = 130 pcf o=0 S900 lb/ft? 30 - Soft to med. CLAY y = 120 pcf = 0 Su = 700 lb/42 40 - 50 - 60 Dense SAND and gravel y = 130 pcf o = 40° c'=0 70