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제안 방법
- It is also noteworthy to mention that Mikasa's finite strain theory has the advantage of being used in conjunction with settlement or strain data being mostly available in the field rather than on excess pore pressures with the Terzaghi theory. In this study, a finite difference program is made for a onedimensional consolidation analysis of a homogeneous clay layer that is overlain by sand or fill layers, and/or underlain by sand layers or rock (Fig. 1), that is integrated with the finite element program OpenSees (2000) for the load transfer analysis and prediction of the induced negative skin friction from the soil settlements. The integrated software program, PileNSF, thus analyzes the problem of negative skin friction on single piles in a two-step approach: (1) finite difference method for the analysis and prediction of effective soil stresses and settlements based on Mikasa's (1965) generalized one-dimensional consolidation theory in terms of finite strain, and (2) nonlinear load-transfer and finite element analysis with the open-source program OpenSees (2000) as the executable, for the prediction of pile settlements and forces that is subjected to axial load at the pile head and/or imposed displacements from the consolidation settlement of the surrounding soil layers.
- 005year was selected. The pile material was modeled as elastic using the given cross-sectional area, section moment of inertia, and modulus of elasticity for steel pipe. The consolidation coefficient Cv was adapted from Poulos and Davis (1980) and the compressibility coefficient mv adopted from Alonso et al.
- The microcomputer program PileNSF (Pile Negative Skin Friction) is developed by the authors in a graphical user interface environment using MATLAB for evaluating the problem of a pile embedded in a consolidating soil tiiat is subjected to surcharge loading from fill. The program developed has a significant feature of incorporating an advanced settlement theory that considers the variability of the thickness of the compressible layer during consolidation. In addition, the finite reduction of the soil-pile interface length at any time during the progress of consolidation in the clay layer is also accounted for in the calculation of the limiting shaft resistances in the compressible soil layer.
이론/모형
- , 1997; Comodromos and Bareka, 2005). A one-dimensional (ID) soil-pile model with the load transfer method is used by Alonso et al. (1984) to predict the negative skin friction on single piles in an uncoupled analysis with the classical Terzaghi (1943) assumptions of one-dimensional consolidation theory with an elastoplastic and bilinear transfer function for the soil-pile interfece. Wong and Teh (1995) also utilized the load-transfer approach using a hyperbolic criterion for the soil spring element model at the pile shaft.
- In this study, the backbone of the nonlinear T-z curve for clay is approximated from Reese and O'Neill's (1987) relation (Fig. 4a) and the backbone of the nonlinear T-z curve for sand is approximated from Mosher's (1984) relation (Fig. 4b), all of which are being implemented using the TzSimplel materials (Boulanger, 2003a) i효 OpenSees. The pile was modeled as elastic using the cross-section사 properties of the steel pipe material. Skin friction at the pile-fill and pile-clay interfaces were modeled using Mosher's (1984) and Reese and O'Neill's (1987) load transfer relations, respectively. A rigid end-bearing was assumed at the base where the pile was driven to beirock, and the support point at the pile tip was modeled by a pin constraint.
- This paper presents a sine)lified one-dimensional soil-pile analytical model using the nonlinear load-transfer method that is uncoupled with the generalized one-dimensional consolidation theory in terms of finite strain by Mikasa (1965) for the prediction of negative skin friction in single piles. The microcomputer program PileNSF (Pile Negative Skin Friction) is developed by the authors in a graphical user interface environment using MATLAB for evaluating the problem of a pile embedded in a consolidating soil tiiat is subjected to surcharge loading from fill.
- This paper suggests the use of a simplified onedimensional soil-pile analytical model using the nonlinear load-transfer method that is uncoupled with the onedimensional consolidation theory in terms of finite strain (Mikasa, 1965) for the prediction of negative skin friction in single piles. The microcomputer program PileNSF (Pile Negative Skin Friction) is developed by the authors in a graphical user interface environment for this objective.
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