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21
Which geological feature is crucial to consider while designing a dam foundation?
Discuss
Answer & Solution
Answer: Option A
Solution:
Joints and fractures in bedrock can lead to water seepage or structural instability.They must be mapped and treated during dam foundation design.
22
The term �overburden� refers to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Overburden is the loose soil, sediment, and material overlying bedrock.It must often be removed or stabilized before construction.
23
The process of grouting in construction geology is used to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Grouting is the injection of cementitious materials into fractures or voids to increase strength and reduce permeability.
24
Which type of soil is most compressible and thus least suitable for foundation construction?
Discuss
Answer & Solution
Answer: Option A
Solution:
Clay is highly compressible, especially when wet, leading to settlement problems under structural loads.
25
What is the primary concern when constructing tunnels in schist rock?
Discuss
Answer & Solution
Answer: Option C
Solution:
Schist has foliation planes which can become failure surfaces, requiring reinforcement.
26
The water table should be determined before construction because:
Discuss
Answer & Solution
Answer: Option B
Solution:
High water tables can reduce bearing capacity and cause buoyancy effects or seepage, impacting foundation design.
27
Why is granite considered a good foundation material?
Discuss
Answer & Solution
Answer: Option C
Solution:
Granite is an igneous rock with high compressive strength and low porosity, making it suitable for heavy structures.
28
Which rock is most likely to form sinkholes when water flows through it?
Discuss
Answer & Solution
Answer: Option C
Solution:
Limestone is susceptible to dissolution by slightly acidic groundwater, forming karst terrain and sinkholes.
29
RQD (Rock Quality Designation) is a measure of:
Discuss
Answer & Solution
Answer: Option C
Solution:
RQD assesses rock mass quality based on percentage of sound rock pieces longer than 10 cm recovered during drilling.
30
When is a retaining wall most likely required during construction?
Discuss
Answer & Solution
Answer: Option C
Solution:
Retaining walls are used to hold back soil in cut slopes or embankments to prevent collapse or erosion.