考虑各向异性及循环效应的SIMSAND模型及应用

doi:10.13722/j.cnki.jrme.2020.0849

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摘要为了研究循环荷载作用下产生的砂土的动力响应问题，如液化，变形累积、刚度衰减等。基于一种简单的临界状态砂土模型(SIMSAND模型)，引入剪应变反转技术，提出可模拟循环荷载效应的本构模型。再通过引入颗粒材料组构各向异性，实现材料在单剪状态下强度弱化等特性。进而通过模拟法国枫丹白露砂的三轴循环试验和单剪循环试验验证了所提的循环模型的有效性和可靠性。然后，针对ABAQUS动力模块进行了此改进本构的二次开发，通过法国国家路桥实验室的模型桩循环荷载试验，建立有限元模型并对比试验结果，研究桩在长期循环荷载作用下动力响应。研究结果表明改进的SIMSAND循环本构模型能较好地应用于有限元建模，并指导桩基在工程中的设计及应用。

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	吴则祥1
	陈佳莹2
	尹振宇3

关键词 ：桩基础, 本构模型, 各向异性, 循环荷载, 砂土

Abstract：To study of the dynamic responses of sand under cyclic loading in the geotechnical engineering，including liquefaction，deformation accumulation and stiffness degradation，a constitutive model for simulating the effect of cyclic loading is first developed by introducing a shear strain reversal technology into the simple critical state sand model(SIMSAND). Then，the degradation of the strength during the simple shearing process is realized by incorporating the structural anisotropy of the granular material. Furthermore，the proposed cyclic model is verified by the triaxial cycle test and the simple shear cycle test on Fontainebleau sand. The enhanced model is implemented into finite element code ABAQUS for explicit dynamics analysis. Using the cyclic model pile test carried out by the French National Road and Bridge Laboratory(ENPC)，finite element simulations are performed to study the dynamic response of piles under long-term cyclic loading. The results show that the enhanced cyclic SIMSAND model can reasonably predict the behavior of cyclic densification and strength degradation of the sand under pile-soil interaction.

Key words： piled foundation constitutive model anisotropy cyclic loading sand

引用本文:

吴则祥1，陈佳莹2，尹振宇3. 考虑各向异性及循环效应的SIMSAND模型及应用[J]. 岩石力学与工程学报, 2021, 40(10): 2113-2123.
WU Zexiang1，CHEN Jiaying2，YIN Zhenyu3. A SIMSAND model considering anisotropy and dynamic effects and its application. , 2021, 40(10): 2113-2123.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0849 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I10/2113

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