1994 Fiscal Year Final Research Report Summary
On Characteristic Properties of Consolidation and Sterngth of Unsaturated Soils.
| Project/Area Number |
05660278
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Saga University |
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Principal Investigator |
FUJIMOTO Masanobu Saga University Professor, 農学部, 教授 (00038241)
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| Co-Investigator(Kenkyū-buntansha) |
KOUMOTO Tatsuya Saga University Professor, 農学部, 教授 (60038304)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Unsaturated soil / Masa soil / Grain size distribution / Unconfined compression strength / Consolidation / pF / Three phases of soil |
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| Research Abstract |
To maintain the long-term stability after construction of unsaturated soil structures, it is necessary to clarify the characteristics of consolidation and strength of unsaturated soils. From such a viewpoint, the influences of grain size distribution, degree of saturation snd dry density of soils on the mechanical and soil moisture properties were investgated experimentally using Masa Soils.
The following results were obtained.
(1)The static stress required to compress up to a constant dry density was smaller, when degree of saturation was higher, or grain sizes had better distributions.
(2)Under a constant dry density, unconfined compression strength showed the peak value at a specific moisture content.
(3)when the initial condition of soil was constant, unconfined compression strength increased as clay contents of soil increased,
(4)The relations of unconfined compression strength and modulus of deformation of unsaturated soil had linearity as well as saturated soils.
(5)Consolidation settlements for 24 hrs.were larger, when degree of saturation was higher, or grain sizes had better distributions.
(6)As coeffiicient of permeaqbility of Masa Soils was high relatively, the ratios of initial settlement to final settlement were larger as compared to those for saturated soils.
(7)Soil moisture characteristic curves were greatly influenced by grain size distribution and their curves sifted to lower side of moisture contents with increasing coarse grain contents.
(8)The moisture contents by volume at constant pF increased with increasing clay content of soils.
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