Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effect of Stress History on CPT-DMT Correlations in Granular Soil

응력이력이 사질토의 CPT-DMT 상관관계에 미치는 영향

  • Lee, Moon-Joo (Hanwha Construction and Engrg.) ;
  • Choi, Sung-Kun (Nawoogeo Consultant Co., Ltd.) ;
  • Kim, Min-Tae (School of Civil, Environmental and Architectural Engrg., Korea Univ.) ;
  • Lee, Ju-Hyeong (School of Civil, Environmental and Architectural Engrg., Korea Univ.) ;
  • Lee, Woo-Jin (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
  • 이문주 ((주)한화건설) ;
  • 최성근 (나우지오 컨설턴트) ;
  • 김민태 (고려대학교 건축사회환경공학과) ;
  • 이주형 (고려대학교 건축사회환경공학과) ;
  • 이우진 (고려대학교 건축사회환경공학과)
  • Received : 2010.04.15
  • Accepted : 2010.06.22
  • Published : 2010.07.31
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Abstract

Stress history increases the residual horizontal stress of granular soil and, consequently, the penetration resistance. This study analyzes the effect of stress history on the cone resistance ($q_c$), horizontal stress index ($K_D$) and dilatometer modulus ($E_D$) of CPT and DMT from calibration chamber specimen in OC as well as NC state. Test results show that the normalized cone resistance by mean effective stress correlates well with the relative density and the state parameter, whereas the normalized cone resistance by vertical effective stress is a little affected by stress history. The influence of stress history is more reflected on $K_D$ than $E_D$ and $q_c$. The $K_D/K_0$, in which the effect of stress history on $K_D$ is compensated by the at-rest coefficient of earth pressure, $K_0$, is related to relative density, state parameter and the normalized cone resistance by mean effective stress. It is also observed that the normalized dilatometer modulus by mean effective stress ($E_D/{\sigma}_m'$) shows a unique correlation with the state parameter, regardless of stress history.

응력이력은 사질토 지반의 잔류 수평응력을 증가시켜 현장시험의 관입저항을 증가시킨다. 본 연구에서는 챔버에 조성된 정규 및 과압밀 시료에 대한 콘관입시험과 딜라토미터 시험을 수행하고 응력이력이 시험결과와 측정값의 상관관계에 미치는 영향을 분석하였다. 시험결과, 평균 유효응력으로 정규화된 콘선단저항은 상대밀도 및 상태정수와 높은 상관성을 보였다. 딜라토미터의 수평응력지수($K_D$)는 콘선단저항($q_c$) 뿐만 아니라, 딜라토미터 계수($E_D$) 보다도 응력이력 영향을 효과적으로 반영하였다. 수평응력지수에 반영된 응력이력의 영향을 정지토압계수인 $K_0$로 보정한 $K_D/K_0$는 상대밀도 뿐만 아니라, 상태정수, 평균 유효응력으로 정규화된 콘선단저항과 응력이력에 관계없는 높은 상관성을 보였다. 또한 평균 유효응력으로 정규화된 딜라토미터 계수($E_D/{\sigma}_m'$)와 상태정수의 관계도 응력이력에 관계없이 유일한 식으로 표현되었다.

Keywords

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