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61
Which technique was primarily used in stabilizing the Vajont Dam slope after the landslide?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Vajont disaster in 1963 involved a massive landslide. Rock bolting and drainage were applied later to stabilize remaining slopes and reduce water pressure, although too late to prevent the catastrophe.
62
In the Gotthard Base Tunnel, what major geological obstacle was encountered?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Gotthard Base Tunnel in Switzerland, the world�s longest rail tunnel, faced high geothermal gradients exceeding 40�C, requiring special cooling and ventilation systems.
63
Which of the following projects faced construction issues due to sinkhole formation in karst terrain?
Discuss
Answer & Solution
Answer: Option B
Solution:
Tunneling in parts of Florida encountered karst terrain with sinkholes, requiring ground improvement and grouting to stabilize the voids.
64
Which of the following best explains the failure of the St. Francis Dam in California?
Discuss
Answer & Solution
Answer: Option C
Solution:
The St. Francis Dam collapsed due to unrecognized weaknesses at the contact between schist and conglomerate, highlighting the importance of geological mapping in engineering.
65
In the Three Gorges Dam project, how was reservoir-induced seismicity mitigated?
Discuss
Answer & Solution
Answer: Option B
Solution:
The controlled and gradual filling of the reservoir helped mitigate the risk of reservoir-induced seismicity by reducing stress changes in the crust.
66
Which type of rock was primarily encountered during tunneling in the Brenner Base Tunnel?
Discuss
Answer & Solution
Answer: Option C
Solution:
The Brenner Base Tunnel traverses Flysch formations, a mix of soft and hard sedimentary rocks, requiring adaptive TBM strategies and support systems.
67
What key lesson was learned from the Nicoll Highway collapse in Singapore?
Discuss
Answer & Solution
Answer: Option C
Solution:
The collapse was due to inadequate diaphragm wall embedment into stiff clay, causing basal failure during excavation�a major geotechnical oversight.
68
Which of the following techniques helped manage groundwater during Delhi Metro Phase 3 tunneling?
Discuss
Answer & Solution
Answer: Option D
Solution:
Recharge wells were installed to maintain the groundwater table and reduce drawdown, protecting surrounding structures and ecosystems.
69
What type of failure occurred in the Aberfan disaster in 1966?
Discuss
Answer & Solution
Answer: Option C
Solution:
The Aberfan tragedy occurred when a coal spoil tip collapsed on a school after heavy rain, due to saturation and lack of proper drainage.
70
What was a geological advantage in building the Channel Tunnel between UK and France?
Discuss
Answer & Solution
Answer: Option C
Solution:
The tunnel was bored through Chalk Marl, which provided good strength, low permeability, and predictable conditions, ideal for long tunneling.