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  Port Said Tunnels under the Suez Canal - Cross passages with ground freezing in aggressive conditions

  The Port Said twin tube road tunnels are crossing the Suez Canal, Egypt, with length of bored stretch of 2,85 km. The tunnels were constructed in adverse soft soil conditions including groundwater with high salt concentration and the presence of dissolved methane gas. The twin tubes are connected with 2 cross passages of 17.4m length at 1km intervals. The two cross passages were constructed with conventional excavation method using the artificial ground freezing technology to stabilize the water bearing soil. The project boundary conditions along with geological and hydrogeological particularities challenged the construction of the cross passages as many unexpected problems and risks identified during the freezing up period. Amongst others, unfrozen water was found with temperature up to -19 ºC. Special design and constructions measures were taken to deal with unexpected problems and an advanced sophisticated real time monitoring system was adopted.

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