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Abstract Based on Longtoushan tunnel which is the largest in China at present in Guangzhou，the contents，technique and method of deformation monitoring of super large section tunnel are descried. The deformation law of the slope，surrounding rock and support system with different surrounding rocks are analyzed；and the engineering measures to control the deformation are put forward. The result shows that：(1) the construction of the up-stage in the right hole，the down-stage in the left hole and the up-stage of the core soil，which cause large rock deformation，are the main points for controlling the rock deformation；(2) the deformation has a exponential relationship with the radius of tunnel；and (3) the enclose of lining and using of cross anchor is effective method to improve the performance of lining and to restrain the deformation of the tunnel；and it is important to construct the inverted arch and close the lining. The study results can be for reference in the design，construction and research of similar tunnels.
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Received: 21 April 2009
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