FOR PROBLEM 5-9 CHOOSE THE TWO BEST ENGINEERING CONSIDERATIONS FROM THE CHOICES

ID: 111916 • Letter: F

Question

FOR PROBLEM 5-9 CHOOSE THE TWO BEST ENGINEERING CONSIDERATIONS FROM THE CHOICES PROVIDED

5. Dam foundation construction on altered extrusive igneous rocks.

a. Usually strong with few limitation for construction

b. Susceptible to strength loss on weathering because they weather to clay minerals

c. Flow of water through the joints/bedding planes may be problematic and lead to water flow or failure by piping

d. May be susceptible to liquefaction during earthquakes

6. Tunnel construction through foliated, unaltered metamorphic rocks

a. Strength depends on interlocking network of mineral crystals

b. Susceptible to strength loss on weathering because they weather to clay minerals

c. Flow of water through the joints/bedding planes may be problematic due to weakening rock structure or producing water flow.

d. Water infiltration may lead to the formation of sinkholes

7. Proposed housing subdivision with a storm water retention basin in karst terrain.

a. Flow of water through the joints may be problematic due to weakening rock structure or producing water flow.

b. Water infiltration may lead to the formation of sinkholes

c. Reservoirs or dams may leak along bedding planes or through solution cavities

d. Strength depends on cementation, particle size and shape, and particle mineralogy

e. Usually strong with few limitations for foundations, dams, and excavations

8. Bridge construction across a valley with alluvial deposits along the valley floor.

a. May be susceptible to liquefaction during earthquakes

b. Soil deposits will vary both vertically and laterally across the valley depending on depositional environment

c. Soil structure may collapse so prewetting of the foundation soils will likely be required

d. Usually strong with few limitations for foundation support or excavations

e. May be a good source for construction materials

9. Highway construction through glacial deposits

a. Soil deposits will be highly variable with respect to material properties both horizontally and vertically, even within short distances

b. Usually strong with few limitations for construction

c. May be water soluble

d. May be a good source for highway fill material

Ans 5- (a) Usually strong with few limitation for construction.

Ans 6- a. Strength depends on interlocking network of mineral crystals.

Ans 7 - e. Usually strong with few limitations for foundations, dams, and excavations.

Ans 8- b. Soil deposits will vary both vertically and laterally across the valley depending on depositional environment.

Ans 9- a. Soil deposits will be highly variable with respect to material properties both horizontally and vertically, even within short distances.

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