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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 广泛用于地下调查。然而，由于该问题是锥体周围大变形最困难的边值问题之一，因此侵彻过程的机理尚未得到合理解释。欧拉有限元方法已成功应用于锥侵彻过程分析。如果材料位移增量与网格点位移增量分离，则可以避免与单元变形相关的问题。讨论了粘土和砂沉积物中的性能。对粘土进行不排水分析是因为粘土沉积物中的渗透过程可以被视为完全不排水条件下的现象。选择金海湾现场 CPT 来验证粘土矿床中 CPT 的计算性能。另一方面，选择东荻岛再生砂矿床和草川更新世砂矿床作为砂质矿床的代表。与粘土矿床的情况不同，砂质矿床的渗透过程满足完全排水的条件。数值评估中还引入了剪胀效应。对于粘土和砂沉积物，计算的性能可以很好地描述原位锥尖阻力，并显示由于渗透而在锥体周围产生显着的应力积聚和大应变。此外，即使在砂等摩擦材料中，塑性变形的影响区域也局限于锥轴附近。