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Abstract: Tseung Kwan O – Lam Tin Tunnel (TKO-LTT) comprises the construction of a 4.2 km dual two-lane highway connecting Tseung Kwan O in the east and East Kowloon in the west. About 2.2 km of the TKO-LTT is in form of rock tunnels and semi-caverns with excavation width and height up to 30 m. Key site constraints include the existing railway tunnels, squatter village, historic buildings, high-rise...