钙质砂中静力触探试验的大变形有限元模拟
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作者单位:

1.中国海洋大学;2.中国地质大学(武汉)

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国家自然科学基金


Large deformation finite element analysis of cone penetration tests in calcareous sands
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Affiliation:

1.Ocean University of China;2.China University of Geosciences

Fund Project:

National Natural Science Foundation of China

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    摘要:

    静力触探试验(CPT)被广泛用于确定无黏性土的力学性质,现有研究集中在普通石英砂,由CPT贯入阻力推测钙质砂强度特性的成果很少。钙质砂的峰值内摩擦角一般高于石英砂,内摩擦角和剪胀角随应变的变化也不同于石英砂。本文采用任意拉格朗日欧拉格式的大变形有限元方法,模拟石英砂和钙质砂中CPT的完整贯入过程,有效避免了锥尖周围的网格扭曲。其中引入修正摩尔-库伦模型,描述石英砂和钙质砂强度发挥与塑性剪应变的关系,由弯曲元和三轴排水试验确定本构模型参数。数值模拟得到的锥尖贯入阻力与已有离心机试验结果吻合,表明建立的数值模型能够再现钙质砂中的静力触探试验。

    Abstract:

    The cone penetration test (CPT) is widely used to determine the mechanical properties of cohesionless soils. Most of the existing correlations were established in terms of silica sands, while the data for calcareous sands are limited. Calcareous sands are featured with higher peak internal friction angle and the variation of friction angle and dilation angle with strain in calcareous sands is also different from silica sands. In this paper, a large deformation finite element approach, the Arbitrary Lagrangian Eulerian method is used to study cone penetration in calcareous and silica sands. Frequent mesh generations are conducted to avoid distortion of soil elements around the cone tip. A modified Mohr-Coulomb constitutive model is introduced to describe the mobilized strength varied with plastic shear strain in calcareous and silica sands. The elastic and plastic parameters are determined by bender element tests and drained triaxial tests. Numerical results of cone tip resistance agree reasonably well with the existing data from centrifuge tests. It demonstrates that the established numerical model has potential to capture the cone penetration in calcareous sands.

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  • 收稿日期:2020-06-04
  • 最后修改日期:2020-06-25
  • 录用日期:2020-07-04
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