| 基于OpenSees的砂土本构模型对比研究 |
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| 引用本文： | 周林禄,苏雷,邱志坚,凌贤长,张安琪.基于OpenSees的砂土本构模型对比研究[J].西北地震学报,2022,44(1):128-135. |
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| 作者姓名： | 周林禄 苏雷 邱志坚 凌贤长 张安琪 |
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| 作者单位： | 青岛理工大学土木工程学院;厦门大学建筑与土木工程学院;哈尔滨工业大学土木工程学院 |
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| 基金项目： | 国家自然科学基金(51808307);国家重点研发计划(2016YFE0205100)。 |
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| 摘 要： | 饱和砂土液化是由地震引起的一种最常见的工程地质现象,也是造成重大地震灾害的主要原因之一。由于成因的复杂性和所造成灾害的严重性,饱和砂土液化一直是土动力学和岩土地震工程研究领域的重要课题。针对饱和砂土液化问题,基于开源地震工程数值计算平台OpenSees,对材料库中的4种砂土本构模型进行数值计算。采用二维u-p单元模拟土颗粒位移和孔隙水压力,分析和对比4种模型在循环动力荷载作用下的加速度、超孔隙水压力、位移、剪应力-剪应变和平均有效应力路径方面的响应结果。研究结果表明:(1)砂土对输入加速度表现出一定的放大效应,对于不同的模型,该放大效应存在一些差异;(2) Stress Density模型在循环动力荷载作用下易产生永久变形;(3)在循环动力荷载作用下,PDMY模型和CycLiqCPSP模型的强度逐渐降低,直到完全消失;(4) Stress Density模型和Manzari Dafalias模型在循环动力荷载下表现出明显的剪胀效应。研究成果对砂土液化的数值模拟问题具有重要的理论价值,可为饱和砂土的液化模拟和砂土本构模型的选取提供参考。
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| 关 键 词： | 饱和砂土 液化 本构模型 数值计算 循环荷载 |
Comparison of four constitutive models for sand based on OpenSees |
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| ZHOU Linlu,SU Lei,QIU Zhijian,LING Xianzhang,ZHANG Anqi.Comparison of four constitutive models for sand based on OpenSees[J].Northwestern Seismological Journal,2022,44(1):128-135. |
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| Authors: | ZHOU Linlu SU Lei QIU Zhijian LING Xianzhang ZHANG Anqi |
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| Institution: | (School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China;School of Architecture and Civil Engineering, Xiamen University, Xiamen 361005, Fujian, China;School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China) |
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| Abstract: | As one of the most common engineering geological phenomena caused by earthquake,the liquefaction of saturated sand is also one of the main causes of major earthquake disasters.Due to the complexity of causes and the severity of disasters,the liquefaction of saturated sand has always been an important subject in the field of soil dynamics and geotechnical earthquake engineering.In this paper,based on the platform OpenSees,the numerical simulation were carried out on four constitutive models for sand.The response results of the four models in terms of acceleration,displacement,excess pore water pressure,shear stress-strain,and mean effective stress path under the action of cyclic dynamic load were analyzed and compared.The research results showed that:(1)Sand shows a certain amplification effect on the input acceleration,and there are some differences in the amplification effect for different models;(2)Stress Density model is prone to permanent deformation under cyclic dynamic load;(3)Under cyclic dynamic load,the strength of PDMY model and CycLiqCPSP model gradually decreases until it completely lost;(4)Stress Density model and Manzari Dafalias model show obvious dilatancy effect under cyclic dynamic load.The research results have important theoretical value for the numerical simulation of sand liquefaction,thus providing a reference for the liquefaction simulation of saturated sand and the selection of constitutive models for sand. |
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| Keywords: | saturated sand liquefaction constitutive model numerical calculation cyclic loadin |
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