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Abstract Base on the up-under crossing running subway project in Shanghai metro construction，with the numerical simulation approach，the disturbance cause by shield crossing is analyzed under the sequence of under crossing first then up. The result shows that it could satisfy the operation and environment requirements when the ground loss rate is controlled to less than 3‰. For further analysis，the deformations caused by two cases of up-under crossing and up crossing only is compared. The result shows that the up-under crossing lead a larger rebound float owing to disturbing effect in advance. Finally，based the theoretical predictions and the difference between the two cases，a series of controlling measures to control the diversification are formulated. It provides a reference for the similar projects.
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Received: 20 May 2011
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2011, Vol. 30 
