岩土工程学报2016，Vol.38Issue(12)：2203-2211,9.DOI:10.11779/CJGE201612008
循环荷载作用下吸力锚基础变形的数值分析方法研究
Numerical methodfor the deformation of suction anchorunder cyclic loading
摘要
Abstract
The suction anchor with taut mooring system is an important floating platform foundation in deep water. Large deformation of soil occurs under the combination of static and cyclic loadings, which impacts the stability of the suction anchor foundation severely.A pseudo-dynamic visco-elastic plastic constitutive model which describes the undrained cyclic stress-strain response of saturated soft clay is introduced. The model combines the equivalent visco-elastic theory with the creep theory, describing the nonlinearity and hysteresis of the cyclic stress-strain relationship through the equivalent visco-elastic model and the cyclic accumulative characteristic through the creep theory. Based on the pseudo-dynamic visco-elastic plastic constitutive model, a pseudo-dynamic visco-elastic plastic finite element method is developed for the assessment of the deformation process of the suction anchor foundation subjected tothe combination of the static and cyclic loadings. The method does not track the cyclic stress-strain response, but treats the number of cycles as the time. The cyclic deformation of anchor foundation isdetermined by the equivalent visco-elastic calculation. The accumulative deformation is determined using the initial strain method on the basis of the static stress and cyclic accumulative strain potential. The relationshipbetween the deformationand the time of anchor foundation that is the displacement-time history curve can be obtained according to the cyclic and accumulative deformations. The comparison between the calculated results by the finite element method and the anchor model test results under 1g conditions shows that the both are basicallyinagreement.关键词
拟动力本构模型/吸力锚/模型试验/循环变形/循环累积变形Key words
pseudo-dynamic constitutive model/suction anchor/model test/cyclic deformation/accumulative deformation分类
建筑与水利引用本文复制引用
李书兆,王建华..循环荷载作用下吸力锚基础变形的数值分析方法研究[J].岩土工程学报,2016,38(12):2203-2211,9.基金项目
国家自然科学基金项目 （）
