1. The short term stability of an embankment constructed with clay can be determ

Question

1. The short term stability of an embankment constructed with clay can be determined using the shear strength parameters derived from:

a. Conducting consolidated drained (CD) direct shear tests on identical specimens

b. Conducting consolidated drained (CD) triaxial shear tests on identical specimens

c. Conducting consolidated undrained (CU) triaxial shear tests with pore-pressure measurements during the shearing stage on identical specimens

d. This is crazy! I am not going to answer this question.

e. None of above tests

2. The shear strength equation proposed by Terzaghi extending the Mohr-Coulomb failure criterion, is valid for: ??'tan'wcu??????

a. Normally consolidated clays only

b. Over consolidated clays only

c. Both for normally and over consolidated clays

3. Several parameters are listed below for increasing the load carrying capacity of a coarse-grained soil; which one of the following is more effective than the others.

a. increase the thickness of the foundation

b. decrease the depth of the foundation

c. increase the depth of the foundation

d. increase the width of the foundation

e. by raising the ground water table to the natural ground level

4. When the total weight of the soil excavated for the foundation equals the total weight of the structure for construction, the foundation is called:

a. Mat or raft foundation

b. Shallow foundation

c. Floating foundation

d. Dancing foundation

5. The swelling index, Cs should be determined to estimate the

a. Consolidation settlement of normally consolidated clays

b. Consolidation settlement of overconsolidated clays

c. Preconsolidation pressure (i.e. past maximum effective overburden pressure)

d. Compression index

e. Degree of consolidation of a clay layer at some time t after the load is applied

Explanation / Answer

Answer (1)- (c). Conducting consolidated undrained (CU) triaxial shear tests with pore-pressure measurements during the shearing stage on identical specimens

Answer (2)- (a). Normally consolidated clays only

Answer (3)-c. increase the depth of the foundation

Answer (4)-a. Mat or raft foundation

Answer (5)-d. Compression index

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