1994 Fiscal Year Final Research Report Summary
Research on practical evalution of frost heaving force acting on structures
| Project/Area Number |
04650429
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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 | Kitami Institute of Technology |
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Principal Investigator |
SUZUKI Teruyuki Kitami Institute of Technology, Cicil Engineering, Professor, 工学部, 教授 (30003205)
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| Co-Investigator(Kenkyū-buntansha) |
SAWADA Seigo Kitami Institute of Technology, Civil Engineering, Lecturer, 工学部, 講師 (10003203)
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| Project Period (FY) |
1992 – 1994
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| Keywords | ground / cold region / civil engineering structures / frost heaving force / adfreeze frost heaving |
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| Research Abstract |
Four kinds of experiments were performed. 1) Measurement of frost heaving pressure at natural ground surface during winter seasons. 2) Measurement of adfreeze frost heaving force of natural ground to concrete models. 3) Laboratory test on adfzeeze strength of moistened soil to concrete surface. 4) Full scale model test on frost heaving pressure of reinforced retaining wall (multi anchored retaining wall) . Results obtained from these field and laboratory tests were as following.
1) Frost heaving pressure of natural ground was about 5 kgf/cm^2 (500kPa) . This value was not so remarkably influenced by seasonal factor such as freezing index, frost penetration depth, and so on.
2) The adfreeze frost heaving stress of natural ground to concrete surface was 0.8 kgf/cm^2 (80 kN/m^2) in sircular pile, and 0.4 kgf/cm^2 (40 kN/m^2) in flat plate. These stresses were decreased by making taper shape or surface painting.
3) The adfreeze strength of soil to concrete surface measured in laboratory test was far larger than the adfreeze frost heaving stress of natural ground obtained in field test, because of creep of frozen soil.
4) Frost heaving pressure measured in full scale model of reinforced retaining wall was 4.5-5.0 tonf/m^2 (45-50 kPa) . This value was one-ten of the frost heaving pressure of natural ground described in 1) . The frost heaving pressure arised in the retaining wall was influenced by deformation of the wall, stress relaxation towards backfill surface, and so on.
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