Study on the evaluation method of in-situ deformation-strength characteristics of granular material with breakable particles
| Project/Area Number |
02650341
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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 |
基礎・土質工学
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
ISOZAKI Shinichi (1991) Faculty of Engineering, Muroran Institute of Technology, Research Associate, 工学部, 助手 (80176255)
三浦 清一 (1990) 室蘭工業大学, 工学部, 助教授 (00091504)
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| Co-Investigator(Kenkyū-buntansha) |
磯崎 真一 室蘭工業大学, 工学部, 助手 (80176255)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Volcanic Soil / Particle Breakage / Sandy Soil / Stress-Strain Curve / Bearing Capacity / Anisotropy / Liquefaction |
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| Research Abstract |
The following results were obtained from experimental and analytical researches aimed study the rational procedures which can evaluate the stress-deformation behavior of granular material mainly constituted by breakable particles.
1. Shear behavior of volcanic coarse grained soils has a strain hardening-softening characteristics similar to that of dense sand at lower confining pressure. And plastic behavior similar to clay has been found on the shearing with higher confining pressure.
2. A unique relationship between the increment of finer fraction DELTAFc and effective mean principal stress at failure p'f can be found regardless of the difference in the shear condition or in the stress system. This facts show that the value DELTAFc is an appropriate parameter which can express particle breakage induced by shearing.
3. From the experimental results under the same shear condition, it has been shown that strength values for undisturbed samples are higher than ones of disturbed samples. This is attributed to the cementation effect which may prevent particle breakage.
4. Strength of volcanic soil was higher under the plane strain condition than under the axisymmetric stress condition, as can been seen in the normal granular materials. This tendency was more remarkable in volcanic soils than Toyoura sand.
5. Effect of particle breakage on the mechanical properties of coarse volcanic soil is more significant under plane strain condition than under axisymmetric stress condition. Consequently, strain hardening properties of coarse volcanic soil is closely related to particle breakage and shear condition(two or three-dimensional deformations and difference in stress path).
6. Inherent anisotropy effect was not found on the axial-symmetry tests which allows three-dimensional deformation. However, such effect was obviously kept to the failure states on the plane stress condition.
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Report
(3 results)
Research Products
(24 results)
