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Abstract Dongshankou station of Guangzhou metro line #6 is constructed by expanding shield driven tunnel. The ground building?s piles are in the strata of high moisture content and void ratio，so the new station construction is easy to cause large surface settlement. Taking into account the influence of construction on the groundwater level，the application effect of in-situ deformation control measure is predicted by numerical simulation method，which is compared with the measurement data. The results show that：(1) The ratio of water loss settlement to expanding excavation settlement is 2∶3. (2) Settlement during upper-bench excavation is large，and there is little difference between two-step and four-step excavation scheme. The maximum surface settlement of shield tunnel expanding method accounts for 65% of CRD construction method. (3) the advance pre-support in the arch increases the width of the settlement trough and decreases the surface settlement and inclination. The axis deviation scheme of shield machine reduces the area of plastic zone，making the effect of the advance pre-support more obvious.
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Received: 27 August 2011
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2013, Vol. 32 
