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Exam2-solutions

# Exam2-solutions - N a m e S o I u i C E 4 6 7 G e o t e c h...

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Name: SoIu-i- CE 467 Geotechnical Engineering Midterm Exam #2 April 13, 2010 ** PLEASE SHO WALL YOUR WORK ** *** WRITE NAME OR INITIALS ONALL PAGES *** 1. For the flow conditions shown below in Fig. 1, ‘sat for the pervious strata is 19.4 kN/m 3 . Calculate the following: a. The effective stresses at points A, B and C b. The factor of safety against heave failure adjacent to the sheet piling. Use the dimensions shown to approximate any other dimensions as appropriate. 2. A saturated clay specimen is tested in an undrained triaxial compression (CU TXC) test. The back pressure was 250 kPa. The specimen was isotropically consolidated to an effective stress of 200 kPa. At failure, the pore water pressure, u, was 210 kPa, and the deviatior stress was 386 kPa. Answer the following: a. Find the effective stress friction angle at failure. b. Do you think this clay is likely normally or overconsolidated? Why? c. If a specimen of the same clay was tested in a drained compression (CD TXC) test, and the isotropic effective consolidation stress was 300 kPa, what

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