1992 Fiscal Year Final Research Report Summary
Visco-Elastic Behavior of Fractured Rock
| Project/Area Number |
03452238
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
資源開発工学
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
OKUBO Seisuke The Univ. of Tokyo, Faculty of Eng., Professor, 工学部, 教授 (90092155)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
AKIYAMA Masao The Univ. of Tokyo, Faculty of Eng., Assistant, 工学部, 助手 (00011172)
|
|---|
| Project Period (FY) |
1991 – 1992
|
| Keywords | Rock / Visco-elasticity / Constitutive Equation / Time Dependence / Creep / Relaxation / Moisture |
|---|
| Research Abstract |
At first, a very simple constitutive equation of variable compliance type is discussed, which can be applicable to a fractured rock. The constitutive equation can be solved analytically for several loading conditions such as creep, relaxation, constant strain rate, constant stress rate and allows to examine the relations of time dependent behavior among these loading conditions.
Also in this study, six rocks were tested in uniaxial compression up to the post-failure region. With increase of loading rate, it was found for all samples that the strength increases and stress-strain curve in the post-failure region shifts to the right-hand side. The slope of the stress-strain curve, however, does not change meaningfully with loading rate. It should be noted that the increase of strength with 10 fold increase of loading rate has a certain value which does not depend on moisture content.
The constitutive equation was used to simulate the loading rate dependency under uniaxial compression tests. It was found that the calculated results give a good approximation to the experimental results for all sample rocks.
|
