Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
권호 표지
DOI QR코드

DOI QR Code

Particle Crushing Properties of Decomposed Granite Soil due to Changes in the Degree of Weathering

풍화도 변화에 따른 화강풍화토의 파쇄특성

  • Received : 2013.01.15
  • Accepted : 2013.03.05
  • Published : 2013.03.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the characteristics of particle crash of decomposed granite soil sampled at Pocheon area were presented. The degree of weathering was artificially achieved by means of hydrofluoric acid. Weathering index was firstly determined by the analysis of mineral composition. Then, particle distribution, permeability tests were conducted. The results showed that weathering effects on particle crash over entire particle sizes. Comparative analysis on specific surface between $D_{10}$ and $D_{50}$ indicated that the smaller the particle size, the more the particle crash. In addition, the most particle crashing due to compaction appeared around the optimum moisture content. The incremental ratio of specific surface appeared to decrease as weathering proceeds, which means that the higher the weathering index the less the particle crash.

본 연구는 포천에서 채취된 화강풍화토를 불산용액을 이용하여 인공적으로 풍화를 진행시켜서 풍화도 변화에 따른 화강풍화토의 입자파쇄 특성을 연구하였다. 이를 위해 조성광물 분석을 통한 풍화지수 결정 후, 입도분석, 표준다짐시험 및 변수위 투수시험을 실시하였다. 본 연구결과는 풍화가 진행되면서 전체입경분포에서 입자파쇄가 진행되었으며, 입경 $D_{10}$과 $D_{50}$에 대한 비표면적을 비교한 결과 입경 $D_{50}$ 이하의 작은 입경분포에서 입자파쇄가 활발하게 진행된 것으로 나타났다. 또한 다짐에 의한 입자파쇄 결과는 최적함수비 부근에서 입자파쇄가 최대치를 보였고 풍화가 진행됨에 따라서 비표면적 증분비가 감소하는 것으로 보아 풍화지수가 높을수록 입자파쇄에 둔감한 것으로 나타났다.

Keywords

References

  1. Lee, K. C. (1998), Geotechnical Characteristics of Decomposed Granite Soils Related to the Degree of Weathering, Ph.D Thesis, Chonnam National University, pp.89-203.
  2. Lump, P. (1962), "The Properties of Decomposed Granite", Geotechnique, Vol.12, No.2, pp.226-243. https://doi.org/10.1680/geot.1962.12.3.226
  3. Matsuo. S. and Nishida. K. (1979a), "Physical Properties of Weathered Granite Soil Particles and Their Effect on Permeability", Soils and Foundations, Vol.19, No.1, pp.13-22. https://doi.org/10.3208/sandf1972.19.13
  4. Matsuo, S. and Nishida, K. (1979b), "Physical Properties of Soil Particles and Their Effect on Hydraulic Conductivity of Unsaturated Decomposed Granite Soils", Soils and Foundations, Vol.21, No.4, pp.1-12.
  5. Miura, N. and Yamanoguchi, T. (1975), "Effect of Water on the Behavior of a Quartz-Rich Sand under High Stresses", Soils and Foundations, Vol.15, No.4, pp.23-34. https://doi.org/10.3208/sandf1972.15.4_23
  6. Miura, N., Hyodo, M. and Yasufuku, N. (1984), "Compressive and Shear Characteristic of Undisturbed Decomposed Granite Soils Paying Attention to the Degrees of Weathering", Proceedings of JSCE, No.382, III-7, pp.131-140.
  7. Park, B. K. (1973), "A Study on Physical Properties of Weathered Granitic Soils in Kwangju District", Journal of the Korean Society of Civil Engineering, Vol.21, No.4, pp.37-50.
  8. Park, B. K. (1974), "A Study on Shear Characteristics of Weathered Granite Soil", Journal of the Korean Society of Civil Engineering, Vol.22, No.3, pp.55-66.
  9. Park, B. K., Lee, J. S., Lee, K. C. and Lim, E. S. (1996), "A Permeability and Compression Properties of Decomposed Granite Soil", Proceeding of the Korean Society of Civil Engineering, Vol.3, pp.347-350.
  10. Park, B. K., Lee, J. S., Moon, Y. and Shin, H. C (1997), "Characteristics of Weathering and Breakage of Decomposed Granite Soil Considering Weathering Index", Proceeding of the Korean Society of Civil Engineering, Vol.3, pp.181-184.
  11. Sueoka, T. (1988), "Identification and Classification of Granite Residual Soils Using Chemical Weathering Index", Symposium on the Weathering Residual Soil, pp.89-94.
  12. Tugrul, A. and Gurpinar, O. (1977), "The Effect of Chemical Weathering on the Engineering Properties of Eocene Basalts in Northeastern Turkey", Environmental and Engineering Geosciences, Vol.3, No.2, pp.225-234.

Cited by

  1. Dynamic Characteristics of Decomposed Granite Soils by Changing Geoenvironment vol.13, pp.1, 2014, https://doi.org/10.12814/jkgss.2014.13.1.041
  2. Soil Conditioning of Weathered Granite Soil used for EPB Shield TBM: A Laboratory Scale Study pp.1976-3808, 2019, https://doi.org/10.1007/s12205-019-1484-1
  3. Application Ranges of EPB Shield TBM in Weathered Granite Soil: A Laboratory Scale Study vol.11, pp.7, 2021, https://doi.org/10.3390/app11072995