A Study on the Determination of Construction Depth of Vertical Drain by Cone Resistance

콘 관입저항치를 이용한 수직배수재 타설심도 결정에 관한 연구

  • 김연정 (유신코퍼레이션 지반공학부) ;
  • 김남호 (유신코퍼레이션 지반공학부) ;
  • 신윤섭 (유신코퍼레이션 지반공학부)
  • Published : 2006.12.01

Abstract

Recently, piezocone penetration test is frequently used in order to estimate the characteristics of soft ground with standard penetration test; generally used in the past In this study, standard penetration test, piezocone penetration test, driving resistance of vertical drain were used in order to increase the confidence for determination of soft ground depth. And the compressible layer was determined by the comparison between the preconsolidation pressure and the designed increase pressure. As the results, the relation between standard penetration test and piezocone penetration test shows $q_c$=(1.09~1.63)N at the soft ground, determined by 5/30 N value. And $q_c$(1.21~1.98)N was shown at the point of compressible layer, evaluated by the preconsolidation pressure. And driving resistance of vertical drain is 70 f/$cm^2$ which is equal to 10kgf/$cm^2$ cone penetration resistance.