| Numerical Analyses of Bearing Capacity of Deep-Embedded Large-Diameter Cylindrical Structure on Soft Ground Against Lateral Loads |
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| 作者姓名： | 栾茂田 范庆来 |
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| 作者单位： | State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology，State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology，Dalian 116024 China，Institute of Geotechnical Engineering School of Civil and Hydraulic Engineering Dalian University of Technology Dalian 116024 China Dalian 116024 China，Institute of Geotechnical Engineering School of Civil and Hydraulic Engineering Dalian University of Technology Dalian 116024 China |
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| 摘 要： | 1 .IntroductionThe large-diameter cylindrical structure for coastal and offshore engineering has been widely usedin China .Thistype of structureis composed of a steel or reinforced concrete cylindrical thin-wall shellplaced partlyintothe ground by a speci…
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Numerical Analyses of Bearing Capacity of Deep-Embedded Large-Diameter Cylindrical Structure on Soft Ground Against Lateral Loads |
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| LUAN Mao-tian,FAN Qing-lai.Numerical Analyses of Bearing Capacity of Deep-Embedded Large-Diameter Cylindrical Structure on Soft Ground Against Lateral Loads[J].China Ocean Engineering,2006,20(4). |
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| Authors: | LUAN Mao-tian FAN Qing-lai |
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| Abstract: | Presented in this paper is a three-dimensional plastic limit analysis method of bearing capacity of the deeply-embedded large-diameter cylindrical structure in the cross-anisotropic soft ground. The most likely failure mechanism is assumed to be of a composite rupture surface which is composed of an individual wedge in the passive zone or two wedges in both active and passive zones near the mudline, depending on the separation or bonding state at the interface between the cylindrical structure and neighboring soils in the active wedge, and a truncated spherical slip surface at the base of the cylinder when the structure tends to overturn around a point located on the symmetry axis of the structure. The cylindrical structure and soil interaction system under consideration is also numerically analyzed by the finite element method by virtue of the general-purpose FEM software ABAQUS, in which the soil is assumed to obey tie Hill's criterion of yield. Both the failure mechanism assumed and the plastic limit analysis predictions are validated by numerical computations based on FEM. For the K_0-consolidated ground of clays typically with anisotropic undrained strength property, it is indicated through a parametric study that limit analysis without consideration of anisotropy of soil overestimates the lateral ultimate bearing capacity of a deeply-embedded cylindrical structure in soft ground in a certain condition. |
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| Keywords: | cylindrical structure limit analysis of plasticity soil anisotropy soft ground FEM |
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