Solution HW#4

Solution HW#4 - Solution of Homework No.4 CEE 330 Fall...

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Solution of Homework No.4 – CEE 330 – Fall 2009-10 Date: November 5, 2009 Problem 1: Develop a profile of total stress, pore pressure, and effective stress vs depth for the soil conditions below. Tabulate the stresses at the midpoint of each layer, and create a graph of the profile of stresses vs. depth. The water table is at a depth of 10m. Layer Top Depth (m) Bottom Depth (m) Midpoint Depth (m) Soil Type Unit Weight σ v0 u 0 σ ' v0 (kN/m 3 ) (kPa) (kPa) (kPa) 1 0 8 4 Sand 17.5 70 0 70 2 8 15 11.5 Clay 14 189 15 174 3 15 22 18.5 Sand 18 301 85 216 4 22 30 26 Clay 22 452 160 292
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Problem 2: Calculate the stress in the ground below a wide foundation: A concrete bridge pier is 4m tall, has an area of 10 m2, carries a load of 1MN, and has a self weight based on a unit weight of 24kN/m3. The pier is founded on the bed of a tidal river where there is at least 5m of sand with a unit weight of 20 kN/m3. The river bed at low tide is equal to the ground surface, and at high tide there is a 3m water depth. a. What is the stress at the base of the footing (include self weight and vertical load)?
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Solution HW#4 - Solution of Homework No.4 CEE 330 Fall...

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