| 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)
劉 朝鋼 北見工業大学, 工学部, 助教授 (90240415)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | ground / cold region / civil engineering structures / frost heaving force / adfreeze frost heaving / 冬 / 凍結 / 凍着力 / 凍結土圧 / 自然寒気 / 構造物 / 凍結土圧力 |
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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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