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71
In the Marmaray Tunnel (Turkey), a significant design challenge was:
Discuss
Answer & Solution
Answer: Option C
Solution:
The Marmaray Tunnel crosses the Bosphorus Strait. The main challenge was undersea pressure at depths of up to 60 meters, requiring specially sealed tunnel segments.
72
Which Indian hydropower project required grouting of weathered granite foundation?
Discuss
Answer & Solution
Answer: Option A
Solution:
The Nathpa Jhakri project in Himachal Pradesh encountered weathered granite at the foundation. Extensive grouting was done to ensure foundation integrity under high dam loads.
73
Which technique was used in the Brenner Base Tunnel to reduce tunnel collapse risks?
Discuss
Answer & Solution
Answer: Option C
Solution:
A pilot tunnel and umbrella arch method was used in the Brenner Base Tunnel to stabilize weak ground and reduce risks during excavation in fractured rock masses.
74
What failure occurred in Vajont Dam due to a geological oversight?
Discuss
Answer & Solution
Answer: Option C
Solution:
A massive reservoir-triggered landslide in 1963 displaced water, causing a deadly wave to overtop the dam. The slope instability was due to underestimation of clay layers and fractured rock.
75
Which coastal infrastructure project used ground improvement via stone columns?
Discuss
Answer & Solution
Answer: Option B
Solution:
In the Chennai Port Expansion, stone columns were installed to strengthen soft marine clay and accelerate consolidation for supporting heavy port infrastructure.
76
The primary reason for tunnel lining design changes in Bengaluru Metro was:
Discuss
Answer & Solution
Answer: Option A
Solution:
During construction of the Bengaluru Metro, unexpected groundwater ingress prompted the use of waterproofing membranes and reinforced concrete linings to prevent seepage and ensure tunnel longevity.
77
Which tunnel encountered methane gas hazards during construction?
Discuss
Answer & Solution
Answer: Option A
Solution:
The Hsuehshan Tunnel in Taiwan experienced methane gas pockets, posing explosive risks. Continuous gas monitoring and ventilation were necessary for safe construction.
78
In the Tokyo subway system, which challenge led to deformation of tunnel segments?
Discuss
Answer & Solution
Answer: Option C
Solution:
Differential settlement caused by variation in subsoil strength led to tunnel deformation. Engineers used segmental linings and compensation grouting to address it.
79
The Eurotunnel construction was aided by what crucial geotechnical advantage?
Discuss
Answer & Solution
Answer: Option A
Solution:
The Eurotunnel between UK and France passed through chalk marl - a relatively stable, low-permeability rock that allowed safe and efficient TBM operation.
80
In the Boston Big Dig project, what was the primary method to support deep excavations?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Boston Big Dig used slurry walls extensively. These are deep trenches filled with bentonite slurry to stabilize soil before pouring reinforced concrete walls in-situ.