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Development of finite element code for assessing large deformation problems with ALE

开发用于使用 ALE 评估大变形问题的有限元代码

基本信息

批准号：
09650550
负责人：
MIMURA Mamoru
金额：
$ 0.32万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650550/
关键词：
ALE Finite Element Method CPT Localization of Deformation Stress Concentration Plastic Shear Strain Large Deformation Problem Finite Strain

项目摘要

CPT is widely used for subsoil investigation. However, the mechanism of penetration process has not rationally been explained because this problem is one of the most difficult boundary value problems with large deformation around cone. Eulerean finite element method has successfully been applied to the analysis of the process of cone penetration. The problem with respect to the element distortion can be avoided if the material displacement increments are uncoupled from the grid point displacement increments. Performance in clay as well as sand deposits is discussed. Undrained analysis was used for clay based on the fact that the process of penetration in clay deposits can be considered as a phenomenon under perfectly undrained condition. In-situ CPT at Kinkai Bay site was selected to validate the calculated performance for CPT in clay deposit. On the other hand Higashi Ogishima reclaimed sand deposit and Kemigawa Pleistocene sand deposit are selected as representatives for sandy deposits. Far from the case of clay deposit, fully drained condition is satisfied for the process of penetration in sandy deposit. Dilatancy effect is also introduced into the numerical assessment. For both clay and sand deposits, the calculated performance can describe the in-situ cone tip resistance well, and shows the significant stress build-up and large strain around cone due to penetration. Furthermore, even in the frictional materials such as sand, the affected area in terms of plastic deformation is found to be localized in the vicinity of cone shaft.

CPT广泛用于地基调查。然而，由于该问题是锥体大变形边值问题中最困难的问题之一，其机理至今尚未得到合理的解释。本文将有限元法成功地应用于圆锥贯入过程的分析。如果将材料位移增量与网格点位移增量解耦，则可以避免单元畸变问题。讨论了在粘土和砂沉积物中的性能。不排水分析用于粘土的基础上的事实，渗透过程中的粘土矿床可以被认为是一个现象，在理想的不排水条件下。选择在Kinkai Bay现场进行的原位CPT，以验证CPT在粘土存款中的计算性能。另一方面，东大岛再生砂存款和Kemigawa更新世砂存款被选为桑迪存款的代表。与粘土存款的情况不同，桑迪存款中的渗透过程满足完全排水条件。在数值计算中还引入了扩容效应。对于粘土和砂沉积物，计算的性能可以很好地描述在原位锥尖阻力，并显示了显着的应力积累和大的应变锥周围由于穿透。此外，即使在摩擦材料，如沙子，在塑性变形方面的影响区域被发现局限于附近的锥轴。