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SENSIBILITY ANALYSES OF THE DUNCAN-CHANG MODEL PARAMETERS TO DEFORMATION OF SUPPORTING STRUCTURE FOR FOUNDATION PIT

DENG Chengfa① ZHAI Shoujun② HU Guangwei③(①Zhejiang Institute of Hydraulics & Estuary,Hangzhou 310020)(②Zhejiang Design Institute of Water Conservancy & Hydro-Electric Power,Hangzhou 310002)(③Hefei Investigation and Design CO.LTD,Hefei 230001)  
Soil model parameters are critical in assuring reliability of numerical results of commonly used finite element method for simulating deformation of supporting structure for deep foundation pit.The Duncan-Chang E-υ model,a nonlinear elastic model widely used in the geotechnical engineering,is chosen in this paper.A retaining structure with double-row piles is used as an example for the sensibility analyses.The results show that the main parameters influencing the deformation of supporting structure are k、G、R_f and.The increase of G、R_f or n can result in an increase in the displacement and the increase of k can result in the decrease of the displacement.On the whole,the sensibility of the Duncan-Chang Model Parameters to the displacement is greater than the sensibility to the moment in the structure.
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