Geotechnical Engineering (한국지반공학회지:지반)

Korean Geotechnical Society (한국지반공학회)
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Strength Characteristics of Sand in Torsion Shear Tests

비틀림전단시험에 의한 모래의 강도특성

  • 남정만 (제주대학교 해양과학대학 해양토목공학과) ;
  • 홍원표 (중앙대학교 공과대학 건설환경공학과,, 중앙대학교 기술과학연구소) ;
  • 한중근
  • Published : 1997.08.01
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Abstract

A series of torsion shear tests were performed to study the strength characteristics of sand under various stress paths during rotation of principal stress. These results can be classified into two groups of 25cm and 40cm according to the height of specimen, and toy que was applied only in the clockwise direction. In this study, strength characteristics of sand for the principal stress ratio in torsion sheartests were investigated and their results were compared with Lade's failure criterion. And the effect for specimen was considered. From the results of tests, friction angle of sand was affected by the deviatoric principal stress ratio $b:(\sigma_2 -\sigma_s)/(\sigma_2, -\sigma_3)$Failure strength of sand was determined not by the stress paths but by the current stress state. From comparison of specimens on 25cm and 40cm height, effect of end restraint could not be found. In the test where b is over 0.5 due to extension force, necking phenomenon by the strain localization was found.

주응력회전시 모래의 강도특성을 연구하기 위하여 일련의 응력경로에 대해 시험을 실시하였다. 이들 결과는 공시체의 높이에 따라 25cm와 40cm로 분류할 수 있으며 공시체에 작용된 토르 크(Torque)는 시계방향으로만 작용시켰다. 본 연구에서는 비 틀림전단시험시 주응력비에 대한 모래의 강도특성이 조사되었고 그 결과를 Lade의 파괴규준과 비교하여 보았다. 그리고 공시체높 이에 대한 영향을 고려하였다. 이들 시험결과로 부터 모래의 내부마찰각은 축차주응력비 $b:(\sigma_2 -\sigma_s)/(\sigma_2,-\sigma_3)$에 많은 영향을 받는 것으로 나타났다. 모래의 파괴강도는 응력경로에 영향을 받지 않고 현재의 응력상태에 의해 결정 되어지며 25cm와 40cm 높이의 공시체에 대한 비교로부터 단부구속의 영향은 발견할 수 없었다. 그리고 신장력이 작용된 b=0.5 이상인 시험에서는 변형을 국부현상에 의한 Necking현상이 발견되었다.

Keywords

References

  1. 한국지반공학회지 v.9 no.4 비틀림전단시험에 의한 모래의 응력-변형률 거동 남정만;홍원표
  2. 한국지반공학회지 v.9 no.4 입방체형삼축시험에 의한 모래의 응력-변형률 거동 남정만;홍원표
  3. 大韓土木學會論文集 v.8 no.1 비틀림 剪斷試驗에 의한 Ko-壓密粘土의 擧動 洪元杓
  4. 大韓土木學會論文集 v.8 no.1 Ko-壓密粘土의 主應力回轉效果 洪元杓
  5. 한국지반공학회지 v.10 no.1 등방단일경화구성모델에 의한 모래의 3차원거등 예측 홍원표;남정만
  6. Advanced Soil Mechanics Das,B.M.
  7. Report No. UCLA-ENG-7917, University of Califoninia Experimental Study of the Behavior of Cohesionless Soil during Large Stress Reversals and Reorientation of Principal Stresses Geiger,E.;Lade,P.V.
  8. Geotechnique v.33 no.4 The Development of a New Hollow Cylinder Apparatus for Investigating the Effects of Principal Stress Rotation in Soils Hight,D.W.;Gens,A.;Symes,M.J.
  9. Geotechnique v.37 no.1 The Engineering Application of Direct and Simple Shear Setting(Discussion) Hight,D.W.;Shibuya,S.;Symes,M.J.
  10. Soils and Found v.29 no.2 Elasto Plastic Behavior of Ko-consolidated Clay in Torsion Shear Tests Hong,W.P.;Lade,P.V.
  11. Journal of Geotechnical Engng. v.115 no.10 Strain Incremental and Stress Directions in Torsion Shear Tests Hong,W.P.;Lade,P.V.
  12. Computers and Geotechnics v.5 no.4 Single Hardening Constitutive Model for Frictional Materials Ⅰ:Plastic Potential Function Kim,M.K.;Lade,P.V.
  13. Laboratory Shear Strength of Soil, ASTM STP 740 Torsion Shear Apparatus for Soil Testing Lade,P.V.;R.N.Yong(ed.);F.C.Townsend(ed.);
  14. J. Engrg. Mech. Div. v.108 no.5 Three-Parameter Failure Criterion for Concrete Lade,P.V.
  15. IUTAM, Symposium on Deformation and Failure of Granular Meterials Localization Effects in Triaxial Tests on Sands Lade,P.V.
  16. Journal of Geotechnical Engng. v.116 no.3 Single-Hardening Model with Application to NC Clay Lade,P.V.
  17. Journal of the Soil Mechanics and Foundations Division v.99 no.SM10 Cubical Triaxial Tests on Cohesionless Soil Lade,P.V.;Duncan,J.M.
  18. Computers and Geotechnics v.6 no.1 Single Hardening Constitutive Model for Frictional Materials, Ⅱ, Yield Criterion and Plastic Work Contours Lide,P.V.;Kim,M.K.
  19. Computers and Geotechnics v.6 no.1 Single Hardening Constitutive Model for Frictional Materials Ⅲ:Comparisons with Experimental Data Lade,P.V.;Kim,M.K.
  20. Ph. D thesis, University of London Undraind behavior of granular materials under principal stress rotation Shibuya,S.