71. In the Marmaray Tunnel (Turkey), a significant design challenge was:
72. Which Indian hydropower project required grouting of weathered granite foundation?
73. Which technique was used in the Brenner Base Tunnel to reduce tunnel collapse risks?
74. What failure occurred in Vajont Dam due to a geological oversight?
75. Which coastal infrastructure project used ground improvement via stone columns?
76. The primary reason for tunnel lining design changes in Bengaluru Metro was:
77. Which tunnel encountered methane gas hazards during construction?
78. In the Tokyo subway system, which challenge led to deformation of tunnel segments?
79. The Eurotunnel construction was aided by what crucial geotechnical advantage?
80. In the Boston Big Dig project, what was the primary method to support deep excavations?
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