Basic Research on Temperature- and Time-Depending Constitutive Equations for Cohesive Soils
| Project/Area Number |
10650485
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Tottori University |
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Principal Investigator |
SHIMIZU Masayoshi Tottori University Faculty of Engineering Associate Professor, 工学部, 助教授 (00115859)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Temperature / Cohesive soils / Time effects / Consolidation / Constitutive properties / Thermal expansion / Density of soil particles / Constant-rate-of-strain consolidation / 二次圧密 |
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| Research Abstract |
Temperature- and time-depending behavior of cohesive soils in one-dimensional compression conditions was studied vertical-pressure-constant consolidation tests under varying temperature and constant-rate-of-strain (CRS) consolidation tests.
The effects of thermal expansion of soil particles were considered in results from tests conducted with varying temperature from 20 to 80℃. The thermal expansion was determined from density-temperature relationships. The validity of the method was evaluated by determining thermal expansion coefficients of a metal from two kinds of tests : to measure the change in length and to use the density-temperature relationships.
Raising temperature causes the decrease in void ratio and secondary compression also causes it. A theoretical relationship between the change in temperature and the secondary compression duration both of which will cause an identical decrease in void ratio was derived. The relationship for a cohesive soil was presented with the consider
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ation of the thermal expansion. The account of thermal expansion resulted in a higher degree of thermally promoted consolidation.
Constitutive properties of a soil can not be determined from the CRS consolidation test because of assumptions included in the basic theory and the method for determining constitutive relationships. Therefore, in order to examine the effects of compression rate upon the constitutive properties, we have to estimate true properties in certain ways. The following procedures were employed : at first, to make a temporal constitutive model based on the CRS consolidation test and to numerically simulate the behavior in the CRS consolidation with the model ; second, to compare the behavior of numerical simulation with that of the real consolidation test and to modify the model if the difference is observed beyond a certain limit. The numerical simulation was done by the finite-deformation finite-element method. This process could assess the effects of compression rate on the parameters in the constitutive model. Less
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Report
(4 results)
Research Products
(31 results)
