| 摘要: |
| 针对静荷载与循环荷载共同作用下软土中张紧式吸力锚的变形失稳过程进行了研究，通过拟动力有限元法模拟了静荷载和循环荷载共同作用下模型锚变形过程，验证了拟动力算法的可行性。分析过程中采用考虑循环荷载作用历史的等效线性黏弹性计算模型描述饱和软黏土不排水循环动力响应，依据蠕变理论描述土单元的循环累积应变响应。基于ABAQUS有限元软件，借助拟动力黏弹塑性模型提出了一种既能描述土体循环动力响应又能获得土体变形循环累积过程的拟动力算法。通过编制脚本程序PYTHON，将计算土体循环动力响应的过程与分析土体变形累积的过程连接起来，使计算机自动完成整个拟动力有限元算法的分析过程，最终实现了不通过详细跟踪循环荷载作用历史即可获得软土中吸力锚在循环荷载作用下变形逐渐循环累积至失稳过程的拟动力算法。 |
| 关键词: 吸力锚 循环荷载 拟动力算法 循环累积变形 循环动力响应 模型试验 |
| DOI： |
| 分类号:TU435 |
| 基金项目:国家自然科学基金资助项目（51179120）；教育部博士点基金资助项目（20130032110045） |
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| A pseudo-dynamic method for deformation process of suction anchors in soft clays under cyclic loads |
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FENG Ting-ting1,2, WANG Jian-hua1,2
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1.State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin;2.Institute of Geotechnical Engineering, Tianjin University, Tianjin
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| Abstract: |
| Studies of the deformation instability process of the suction anchors with taut mooring system under the coaction of the static and cyclic loads in soft clays have been made in the paper. The model test results for the suction anchors subjected to the static and cyclic loads are predicted by the pseudo-dynamic viscoelastic plastic finite element method,and the feasibility of this method is verified. Furthermore, the visco-elastic model represents cyclic deformation response and the creep model describes a cyclic accumulative strain response of soil elements in analysis of procedure which considers effects of the dynamic loads history. Based on ABAQUS finite element software, this paper presents the pseudo-dynamic visco-elastic plastic finite element method by use of the pseudo-dynamic viscoelastic plastic constitutive model, which can not only describe the cyclic dynamic response of clay, but also represent the cyclic accumulative process of deformation of the suction anchors. The procedure by which the dynamic iterative calculation is combined with the cyclic accumulative deformation calculation is compiled by the Python language, and finally the cyclic deformation and cyclic accumulative deformation are calculated without tracking the cyclic loads in the ABAQUS environment. |
| Key words: suction anchors cyclic loads pseudo-dynamic method cyclic accumulative deformation cyclic dynamic response model test |
