2. (16 points) Multiple choice problems (each worth 2 points) Select the BEST an

Question

2. (16 points) Multiple choice problems (each worth 2 points) Select the BEST answer for each problem below, and write the letter clearly in the blank provided. A constant surcharge load that is applied over a large area results in an effective vertical stress distribution that: A. increases with depth B. decreases with depth C. is constant with depth D. increases then decreases with depth E. none of the above 2. The undrained shear strength of a normally consolidated clay is controlled by: A. the cohesion of the clay B. the effective confining stress in the clay C. the water in the clay D. little bugs that live in clay 3. In a laboratory drained test on clay, the shearing rate applied is important ince: A. shear speed must be low enough so that the excess pore water pressure generated has time to remain close to zero throughout the sample during the test B. too fast a shearing rate could cause STP "N" value that is too high C. too slow a shear rate leads to the development of excess pore water pressures in the clay D. the bugs in the clay get upset when there is too much disturbance 4. In the Mohr-Coulomb soil model, the plastic soil parameter o' is considered to be a strong function of: A. the confining pressure B. negative pore pressure C. whether the soil is wet or dry D. none of these things

Explanation / Answer

1.C(because the area is distrubuted over large area..surcharge is constant)

2.A

3.A

4.A

5.A

6.A..sandy soil mostly general shear failure

7.B ( againist the wall)

8.D

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