동결-융해 반복작용으로 인한 화강풍화토의 압축강도 특성 변화에 관한 연구
Effect of Cyclic Freezing-Thawing on Compressive Strength of Decomposed Granite Soils
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초록
본 논문에서는 동결-융해 반복작용이 화강풍화토의 압축강도 특성에 미치는 영향에 관한 내용을 다루었다. 이를 위해 세립분 함유량을 변화시켜 다양한 시료조건을 조성한 후 동결-융해 시험 환경을 조성한 후 동결-융해 반복작용 사이클을 강제 부가하였다. 시료에 대한 평면변형률압축시험 및 미세입자구조의 변화를 가시적으로 확인할 수 있는 전자주사현미경(SEM) 촬영 및 분석을 수행하였다. 먼저, SEM 분석 결과 화강풍화토는 동결-융해 반복작용에 노출될 경우 입자들이 뭉쳐 간극이 증가하는 추세를 보였다. 한편, 압축강도 특성의 경우 세립분 함유량에 따라 다소 차이를 보이는 것으로 나타났는데 세립분 함유량이 적은 경우에는 강도저하 현상을, 세립분 함유량이 많은 경우에는 강도 증가 현상을 보임을 확인할 수 있었다.
Abstract
This paper presents the results of an investigation into the effect of cyclic freezing-thawing on the compressive strength characteristics of decomposed granite soils. A plane strain compression (PSC) tests were performed on a series of test specimens with different freezing-thawing cycles and fine contents to investigate the change in compressive strength under the process of freezing-thawing cycles. Also performed were scanning electron microscope (SEM) tests to investigate the change in structural rearrangement from a micro-scale point of view. The test results showed that the soil particles tend to conglomerate when subject to cycles of freezing and thawing, and that the soil with less fines exhibited decreased shear strength due to the cyclic freezing-thawing while the soils with a larger fine content showed the opposite trend.
참고문헌 (18)
- 김재석, "암반사면의 장기적 안정성 평가기법", 박사, pp.2005
- 신은철, "변형된 동결-융해 시험장치를 이용한 동상민감성흙의 지반공학적 특성", 한국토목섬유학회 논문집, 8(1), pp.53~59 (2009), 한국토목섬유학회
- 하상경, "환경변화에 기인한 암반절취사면의 열화특성에 관한 연구", 석사, pp.2008
- Effect of freezethaw activity on water retention, hydraulic conductivity, density and surface strength of two soils frozen at high water content, "Benoit G.R", USA Cold Regions Research and Engineering Laboratory, ~ (1990)
- Eigenbrod,K.D, "Effects of cyclic freezing and thawing on volume changes and permeabilities of soft finegrained soils", Canadian Geotechnical Journal, 33(4), pp.529~537 (1996)
- Graham, J, "Effects of freeze-thaw and softening on a natural clay at low stresses", Canadian Geotechnical Journal, 22(1), pp.69~78 (1985)
- Jessberger,H.L, "State-of-the-art report－Ground freezing. Mechanical properties, processes and design", Engineering Geology, 18, pp.5~30 (1981)
- Kay, B.D, "State of the art: Heat and mass transfer in freezing soils", Ground Freezing 88, A.A. Balkema, Rotterdam, 1, pp.3~21 (1988)
- Konrad, J.M, "Mechanistic theory of ice lens formation in fine-grained soils", Canadian Geotechnical Journal, 17(4), pp.473~486 (1980)
- Ladanyi,B, "Mechanical behavior of frozen soils", Proceedings of International Symposium on Mechanical Behaviour of Structured Media, Elsevier, Asterdam. Part B, pp.205~245 (1981)
- Leroueil, S, "Effects of frost on the mechanical behavior of Champlain Sea clays", Canadian Geotechnical Journal, 28(5), pp.690~769 (1991)
- Liu, H.J, "Stability analysis of loss of stability caused by freeze and melt of earthen side slopes of highways", Journal of Harbin Institute of Technology, 38(15), pp.764~766 (2006)
- Loch,J.P.G, "State-of-the-art report－Frost action in soils", Engineering Geology, 18(1), pp.213~224 (1981)
- Nixon, J.F, "Thaw consolidation, In Geotechnical Engineering for Cold Regions" (1978), McGraw-Hill
- Qi, J, "Influence of freezing-thawing on strength of over consolidated soils", Chinese Journal of Geotechnical Engineering, 28(12), pp.2082~2086 (2006)
- Sadovsky, A.V, "State of the art: Mechanical properties of frozen soil", Ground Freezing 88, A.A. Balkema, Rotterdam, 2, pp.443~463 (1988)
- Sayles,F.H, "State of the art: Mechanical properties of frozen soil", Ground Freezing 88, A.A. Balkema, Rotterdam, 1, pp.143~165 (1988)
- Slunga,E, "General report on frost action in soil", Ground Freezing 88, A.A. Balkema, Rotterdam, 2, pp.415~417 (1988)