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The Konan Tunnel, under construction in a densely population area of Yokahama City, is a twin tunnel designed to carry three lanes and a sidewalk in each direction. It is 530 m long. Its specifications are a 16.2 m width, a separation of 8.7 m between the tunnels, a cross-sectional area of 143 m 2 , and an overburden of 5 to 24 m. The geology of the ground through which it is being excavated...
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