高压条件下石英砂中的静力触探试验及大变形模拟

孔壮壮; 王栋; 张民生; 裴会敏

doi:10.11835/j.issn.2096-6717.2022.061

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高压条件下石英砂中的静力触探试验及大变形模拟

土木工程 | 更新时间：2023-07-10

- 高压条件下石英砂中的静力触探试验及大变形模拟
- High-pressure cone penetration tests in silica sand using calibration chamber and large deformation analysis
- 土木与环境工程学报 2023年45卷第4期页码：49-55
- 作者机构：
  
  中国海洋大学山东省海洋环境地质工程重点实验室，山东青岛 266100
- 作者简介：
  
  孔壮壮（1996- ），男，主要从事海洋岩土工程研究，E-mail: kzz@stu.ouc.edu.cn。
  王栋（通信作者），男，教授，博士生导师，E-mail： dongwang@ouc.edu.cn。
- 基金信息：
  
  中央高校基本业务经费(841962013);国家自然科学基金(42025702;U1806230)
- DOI：10.11835/j.issn.2096-6717.2022.061
  中图分类号： TU411.93
- 收稿：2022-03-29，
  
  纸质出版：2023-08-25
- 稿件说明：
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孔壮壮, 王栋, 张民生, 等. 高压条件下石英砂中的静力触探试验及大变形模拟[J]. 土木与环境工程学报, 2023,45(4):49-55.

KONG Zhuangzhuang, WANG Dong, ZHANG Minsheng, et al. High-pressure cone penetration tests in silica sand using calibration chamber and large deformation analysis[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 49-55.
孔壮壮, 王栋, 张民生, 等. 高压条件下石英砂中的静力触探试验及大变形模拟[J]. 土木与环境工程学报, 2023,45(4):49-55. DOI： 10.11835/j.issn.2096-6717.2022.061.

KONG Zhuangzhuang, WANG Dong, ZHANG Minsheng, et al. High-pressure cone penetration tests in silica sand using calibration chamber and large deformation analysis[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 49-55. DOI： 10.11835/j.issn.2096-6717.2022.061.

摘要

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。为探究砂土在高应力条件下的力学特性，利用自行研制的高压标定罐，改变围压水平，进行不同密实度石英砂中的静力触探试验，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，有效避免了锥尖周围的网格扭曲。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，并通过修正弯曲元试验，确定合理的土体剪切模量。标定罐试验和大变形有限元方法获得的锥尖阻力结果能很好地相互验证；在此基础上，建立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，与已有的低应力水平试验结果进行对比，证明建立的经验公式能通过锥尖阻力很好地预测砂土的相对密实度。

Abstract

The previous data interpretation equation for medium and low stress is no longer applicable when in-situ tests are carried out in deeply seated soils. In order to explore the mechanical properties of sand under high stress conditions

in this paper

the cone penetration test in silica sand with different relative densities and confining pressure levels 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. Frequent mesh generations were conducted to avoid the distortion of soil elements around the cone tip. 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 was 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 densities was established under high stress condition

and the comparison with the existing low stress test results show that the established equation can predict well the relative density of sand by the cone tip resistance.

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