高压条件下石英砂中的静力触探试验及大变形模拟
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1.中国海洋大学;2.中国海洋大学 山东省海洋环境地质工程重点实验室

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中央高校基本业务经费项目,国家自然科学基金(42025702,U1806230)


High-pressure cone penetration tests in silica sand using calibration chamber and large deformation analysis
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1.中国海洋大学;2.Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China

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    摘要:

    当在深部土层中进行原位试验时,以往针对中低应力水平的数据解译公式不再适用。本文利用自行研制的高压标定罐,变化围压水平,进行不同密实度石英砂中的静力触探试验。同时基于任意拉格朗日–欧拉格式的大变形有限元方法,模拟静力触探仪的完整贯入过程,大变形模拟中采用修正摩尔–库伦模型描述砂土的内摩擦角和剪胀角随累积塑性剪应变的变化。提出了修正弯曲元试验结果以确定剪切模量的方法。标定罐试验和大变形有限元方法结果能够很好地相互验证,在此基础上,建立了高应力条件下静力触探锥尖阻力与砂土相对密实度之间的关系。

    Abstract:

    The previous data interpretation equation for medium and low stress is no longer applicable when in-situ tests are carried out in deep soils. In this paper, the cone penetration test in silica sand with different relative density and confining pressure level was performed in a self–developed high–pressure calibration chamber, and the Arbitrary Lagrangian–Eulerian method, a large deformation finite element approach, was used to study cone penetration in silica sands. A modified Mohr–Coulomb constitutive model was introduced to describe the internal friction and dilatancy angle varied with the plastic shear strain in silica sands. A method for determining shear modulus by correcting the bending element tests is proposed. Numerical results of cone tip resistance agree reasonably well with calibration chamber tests. An empirical equation for cone tip resistance varied with different relative density was established under high stress condition.

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  • 收稿日期:2022-03-29
  • 最后修改日期:2022-04-28
  • 录用日期:2022-05-19
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