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A 1.5 km straight tunnel is being constructed with work beginning at both ends. Unfortunately, due to an engineering mistake, it will not meet

 

A 1.5 km straight tunnel is being constructed with work beginning at both ends. Unfortunately, due to an engineering mistake, it will not meet at the center. This would require a change in the vertical alignment (horizontal alignment is okay). The most efficient vertical design will be use the horizontal distance in the profile view. Design the connection using the highest common speed possible. 3.5m 190 m

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