1993 Fiscal Year Final Research Report Summary
Constitutive model for soil considering induced and inherent anisotropy
| Project/Area Number |
04650437
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
基礎・土質工学
|
|---|
| Research Institution | Nagoya Institute of Technology |
|---|
Principal Investigator |
NAKAI Teruo Nagoya Institute of Technology, Professor of Civil Eng., 工学部, 教授 (00110263)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OKA F Gifu University, Professor of Civil Eng., 工学部, 教授 (10111923)
|
|---|
| Project Period (FY) |
1992 – 1993
|
| Keywords | Sand / Clay / Deformation / Strength / Anisotropy / Constitutive model for soils |
|---|
| Research Abstract |
Soil deposits have anisotropy in nature. However, most of elastoplastic constitutive models for soils do not take into anisotropy, because these are formulated on the basis of isotropic hardening theories. Investigating the anisotropic behavior of sand and clay, we formulated constitutive models for sand and clay in which soil anisotropy could be taken into account properly.
Anisotropy of clay was investigated on the basis of undrained triaxial tests and direct shear tests on natural clay and one-dimensional consolidated clay. The observed anisotropic behavior was uniquely analyzed using a kinematic hardening model for clay in which stress induced anisotropy was taken into consideration. On the other hand, it was experimentally shown that anisotropy of deposited sand was different from that of clay, and the main cause of anisotropy was inherent anisotropy. An elastoplastic model for sand incorporating the fabric anisotropic tensor was able to describe well the anisotropic stress-strain relationship and strength in isotropic compression, triaxial compression and plane strain tests on deposited sand.
|
