Tunneling beneath Cairoby David W. Campo, P.E., (M.ASCE), Sr. Geotech. Engr.; Parsons Brinckerhoff, NY,
Donald P. Richards, P.E., (F.ASCE), Sr. Tunnel Advisor; Lachel & Assocs., Inc., Golden, CO,
Serial Information: Issue 1, Pg. 36-41
Document Type: Feature article
Abstract: The second phase of the Greater Cairo Metro system in Egypt included many geotechnical challenges. Thirteen kilometers of the 19-km heavy rail line were constructed underground within the water-bearing Nile Valley alluvium. The underground works included construction of cut-and-cover tunnels and stations using diaphragm walls, top-down methods, and state-of-the-art computerized injection grouting. Engineers devised an innovative new method that was successful in minimizing surface settlements for the project. In addition, the project featured the construction of special hand-mined connections to the bored tunnels, interesting tunnel boring machine entry and exit methods from underground stations, and a major building underpinning effort.
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