| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 93 === The purpose of this study is to confer the primary influence range of the ground surface settlement caused by deep excavation in clay. Three excavation cases with complete field observations are studied using the finite element method in conjunction with the modified pseudo-plasticity model. Analytic results show that the method can predict the wall deflection and ground surface settlement reasonably. Then, a series of parametric studies on the primary influence range using the finite element method is carried out. The results show the primary influence zone can be determined by Ou and Hsieh’s method based on the characteristics of failure modes. Then, this study proposes that the settlement of the location of the primary influence zone is 0.15 time maximum ground surface settlement and the location of maximum ground surface settlement is 0.33PIZ from the results of parametric studies. Finally, based on field observation’s experiences and the results of parametric studies, a method for predicting the ground surface settlement profile is proposed. The method is used to predict settlement curve for five excavation cases. Comparing the forecasted results with the field observations, the proposed method obtained a fairly reasonable prediction.
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