Select 2 answers that may apply 1) Dam foundation construction on altered extrus

ID: 111927 • Letter: S

Question

Select 2 answers that may apply

1) Dam foundation construction on altered extrusive igneous rocks

a) Usually strong with few limitations for construction

b) Susceptible to strength loss due to weathering because they weather to clay minerals

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

d) May be susceptible to liquefaction during earthquakes

2) Tunnel construction through foliated, unaltered metamorphic rocks

a) Strength depends on interlocking network of mineral clays

b) Susceptible to strength loss on weather because they weather to clay minerals

c) Flow of water through joints may be problematic due to weakening rock structure or producing water flow

d) Water infiltration ay led to the formation of sinkholes

3) 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 the 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

May be a good source for construction materials

4) Highway construction through glacial till deposits

a) Soil deposits will be highly variable with respect to material properties both horizontally and vertically 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

1. Dam foundation construction on altered extrusive igneous rocks

B. Susceptible to strength loss due to weathering because they weather to clay minerals.

2. Tunnel construction through foliated, unaltered metamorphic rocks

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

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

C. Soil structure may collapse so pre-wetting of the foundation soils will likely be required.

4. Highway construction through glacial till deposits

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