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FFP在黏土中贯入过程的CFD模拟

刘君 张雨勤

刘君, 张雨勤. FFP在黏土中贯入过程的CFD模拟[J]. 力学学报, 2018, 50(1): 167-176. doi: 10.6052/0459-1879-17-284
引用本文: 刘君, 张雨勤. FFP在黏土中贯入过程的CFD模拟[J]. 力学学报, 2018, 50(1): 167-176. doi: 10.6052/0459-1879-17-284
Liu Jun, Zhang Yuqin. CFD SIMULATION ON THE PENETRATION OF FFP INTO UNIFORM CLAY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(1): 167-176. doi: 10.6052/0459-1879-17-284
Citation: Liu Jun, Zhang Yuqin. CFD SIMULATION ON THE PENETRATION OF FFP INTO UNIFORM CLAY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(1): 167-176. doi: 10.6052/0459-1879-17-284

FFP在黏土中贯入过程的CFD模拟

doi: 10.6052/0459-1879-17-284
基金项目: 国家自然科学基金项目(No.51479027, 51539008)资助.
详细信息
    作者简介:

    **通讯作者:刘君,教授,主要研究方向:海洋岩土工程,计算土力学. E-mail: junliu@dlut.edu.cn

    通讯作者:

    刘君

  • 中图分类号: TU470.3;

CFD SIMULATION ON THE PENETRATION OF FFP INTO UNIFORM CLAY

  • 摘要: 圆锥静力触探法(Cone penetration test, CPT)广泛应用于土的抗剪强度测试中。在此基础上发展的自由落体式贯入仪(Free fall penetrometer, FFP),依靠自由下落获得的动能和自身重力势能贯入土中,不需要借助外部加载装置,提高其使用的便捷性。但在动力贯入过程中FFP与土的相互作用更为复杂,涉及到土体的率效应和拖曳阻力等的影响。因此,对FFP各项受力和相关参数的准确分析有助于提高其实用性以及测量的准确性。作者采用基于计算流体动力学(computational fluid dynamics, CFD)的分析软件ANSYS CFX 17.0模拟FFP在均质黏土中的贯入过程,借助动网格的大变形分析方法来模拟FFP贯入过程中的运动边界问题。提出了薄层单元法模拟FFP与土体的界面摩擦接触行为。在CFD模拟中,土体材料采用非牛顿流体来模拟,其剪切强度受土体切应变率的影响(即土体的率效应)。通过模拟贯入仪在黏土中以不同的速度贯入的过程,研究FFP的端部阻力和侧壁阻力与贯入速率、土体强度和密度、界面摩擦系数以及率效应参数之间的关系,建立了端部承载力系数、端部和侧壁率效应参数及拖曳系数的表达式,并提出了土体不排水抗剪强度的预测方法,为FFP测试数据的解析提供依据。

     

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出版历程
  • 收稿日期:  2017-08-21
  • 刊出日期:  2018-01-18

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