A Study on the Characteristics of Alluvial Clay in Yangsan-Mulgum

양산-물금 충적점토의 토질특성에 관한 연구

  • 이달원 (한국토지공사 토지연구원)
  • Published : 1997.02.01

Abstract

Experiments both in laboratory and field were performed to compare and analyze the characteristics of alluvial clay. The alluvial clay was sampled in test site in which large-scaled tests for the part of the site are under process to suggest the rational method for alluvial clay and the criterion for ground settlement monitoring system. The followings were observed through the experiments : 1. Natural water content, plastic limit, and liquid limit of alluvial clay composed of highly fine grains were 40~80%, 10~20%, and 30~55%, respectively. The values of these properties were relatively small at the ground surface, while the values showed maximum at G.L.- l0m and gradually decreased below the level. 2. Shear strength of alluvial clay was proportionally increased to the depth. Unconfined and triaxial compressive strengths were 0.2~0.6kgf/$cm^2$ and 0.1~0.3kgf/$cm^2$, respectively. 3. Compression index and secondary compression index showed maximum values at G.L.-l0m and gradually decreased below the level. The value of consolidation coefficient was relatively large at the ground surface, constant with decreasing the depth, and incresed when G.L. was below -20m. 4. Piezocone test appeared that alluvial clay with N value of 2~4 was uniformly distributed with 20~ 30m thickness from the ground surface, sand seam was nonuniformly distributed, and penetration pore pressure was 0.8 ~ 1 times of the hydrostatic pressure. Undrained shear strength and consolidation coefficient were 0.04 ~ 0.76kgf / $cm^2$ and $2.88{\times} 10{^-4}~1.3{\times} 10{^-2} cm^2/s$ respectively.

Keywords

References

  1. An introduction to critical state soil mechanics The mechanics of soils Atkinson,J.H.;P.L.Bransby
  2. Standard test method of deep, quasi-static, cone and friction-cone penetration tests of soil ASTM committee
  3. J. of geotechnical eng. v.112 no.7 Consolidation after piezocone penetration,Ⅱ: Interpretation Baligh,M.M.;J.N.Levadoux
  4. J. of geotechnical eng. v.102 no.11 Cavity expansion in sand with curved envelopes Baligh,M.M.
  5. J. of geotechnical eng. v.106 no.4 Cone penetration in soil profiling Baligh,M.M.;V.Vivatrat;C.C.Ladd
  6. Guidelines for geotechnical design using the cone penetrometer test and pore pressure mesurement Campanella,R.G.;P.K.Robertson
  7. Canadian Geotechnical Journal v.20 no.1 Cone penetration testing in Deltaic soils Campanella,R.G.;P.K.Robertson;D.Gillespie
  8. Principles of geotechnical engineering Das,B.M.
  9. Soils and foundations v.26 no.3 Piezoprobe determined coefficient of consolidation Gupta,R.C;J.L.Davidson
  10. Ground water tracers Davis,S.N.;H.W.Campbell;H.W.Bently;T.J.Flynn
  11. 地盤工學 海野陸渽;垂水尙志
  12. 軟弱地盤の土質工學 稻田培
  13. 한국농공학회지 v.38 no.5 굴착사면의 안정해석과 보강설계법 姜父默;李達遠;趙在弘
  14. J. of geotechnical division v.108 no.4 SPT hammer energy measurements Kovacs,W.D;L.A.Salomone
  15. Soil mechanics design manual 7.1 NAVFAC
  16. J. of geotechnical division v.109 no.11 SPT-CPT correlations Robertson,P.K.;R.G.Campanella;A.wightman
  17. Canadian Geotechnical Journal v.25 no.1 Prediction of wick drain peformance using piezometer cone data Robertson,P.K.;R.G.Campanella;P.T.Brown;K.E.Robinson
  18. Practical problems in soil mechanics and foundation engineering Sanglerat,G.;G.Olivari;B.Cambou
  19. Preccedings of the specially conference on in-situ measurement of soil properties v.2 Measurement of in-situ shear strength Schmertmann,J.H.
  20. Geotechnical testing and instrumentation Singh,A.
  21. Soil Mechanics in Engineering Practice Terzaghi,K.;R.B.Peck;G.Mesri
  22. 現場技術者のための土と基礎ツリズ 盛土の調査設計から施工まで 土質工學會(編)
  23. 土質基礎工學うイプうリ-37 軟弱地盤の理論と實際 土質工學會(編)
  24. 軟弱地盤對策工法總技術 藤田圭一
  25. 築波硏究學園都市地盤圖 松井敏夫