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      • Pack-Drain으로 개량된 점토지반의 거동해석

        오재화 ( Oh Jae Hwa ),남기현 ( Nam Ki Heon ),이문수 ( Lee Moon Soo ),허재은 ( Heo Jae Eun ),김영남 ( Kim Yeong Nam ) 한국농공학회 1996 韓國農工學會誌 : 전원과 자원 Vol.38 No.1

        This paper dealt with FEM analysis of foundation improved with pack drain. The theory on pack drain was scrutinized and observed values in the field were compared with numerical results. Work site of Kwangyang container pier was selected as a case study in which measurement of settlement and pore water pressure was accurately carried out. Biot's consolidation equation was selected as governing one, coupled with modified Cam-clay model as constitutive one. Christian and Boehmer's numerical technique was adopted. Behavior of foundation with pack drain is not simple but very complicated. Discontinuity resulted from rigidity difference between adjacent materials, smear effect and complicated boundary conditions should be considered in the behavior analysis of foundation behavior. The results of numerical analysis were influenced by smear zone. In relevant to this effect, finite element analysis was carried out using the reduced horizontal coefficient of permeability in the smear zone. The numerical results were compared with observed values in surface settlement including pore water pressure. However only lateral di5plaoement by numerical ana1Ysis was shown since its measurement was not performed in the field. The predication of settlement to be developed later can be effectively employed for the obtimization of construction. The predication of residual settlement using the data measured in the field was made by Hoshino, Asaoka and hyperbolic method. Among them, the hyperbolic method proved best one. Settlements accorded well between nume-rical and observed values while pore pressure showed a slight difference. Lateral displacement showed largest values at constant distance from ground surface. The validation of foundation analysis improved with pack drain by computer program employed in this study selecting modified Cam-clay model was satisfactorily secured.

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