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Abstract Combined with engineering case of a super-large deep excavation constructed by frame-top-down method，the deformation and effect on around environments are studied. According to analysis of the monitoring data，some conclusions are drawn as follows. (1) The deformation of retaining piles could be controlled well by use of frame-top-down method；and the deformation law is basically consistent with that by normal construction method. (2) The ground settlements are smaller，but the effect range is far excess of 4.5 times of excavation deep，which is different from the predicted results by former experience. Dewatering is the main reason of wide effect range. (3) The non-uniform settlements of the adjacent building and underground pipeline are small；and their settlements are controlled in allowable range. The results show that the deformation of excavation can be controlled and the around environment can be protected effectively by using this method.
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Received: 27 March 2012
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2012, Vol. 31 
