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2014 Vol.30, Issue 2 Preview Page
A Change of Porewater Pressure under Particle Crushing of Carbonate Sand of Sabkha Layer

Sabkha층 탄산질 모래의 입자파쇄에 따른 간극수압 변화

Seok-Ju Kim1
,
Chang-Tok Yi2
,
Won-Baek Ji3
,
Heui-Soo Han4*
김 석주1
,
이 장덕2
,
지 원백3
,
한 희수4*
1Lecture, Dept. of Civil Engrg., Gyeongbuk Provincial College
2Lecture, Dept. of Civil, Safety and Environmental Engrg., Hankyong National Univ.
3Plant Civil Design Team, DAEWOO Engineer Engrg. & Construction Co. Ltd.
4Prof., Dept. of Civil Engrg., Kumoh National Institute of Technology
1경북도립대학교 토목과 겸임교수
2국립한경대학교 토목안전환경공학과 겸임교수
3대우건설 플랜트토목설계팀 과장
4국립금오공과대학교 토목공학과 교수
*교신저자. *Corresponding Author. 
28 February 2014. pp. 19-32
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Abstract

Carbonate sand of Sabkha layer in the middle east was made of deposition of shell fragments and it consisted of porous particles containing inner void. Generally, at yield stress the soil structure begins to break down, so the porewater pressure and the settlement are increased rapidly. In carbonate sand, unlike quartz sand if particle crushing happens, the inner voids are exposed and porewater pressure can be decreased under yield stress. Porewater pressure can be determined as the sum of excess porewater pressure due to increase of relative density, inner void expose of particle under particle crushing stress and rearrangement of crushed particle fragments. The porewater pressure can be negative value in case of greater amount of inner void expose, so if particle crushing is bigger, the porewater pressure value is smaller. The negative value zone of porewater pressure from triaxial test result means particle crushing effect is bigger than outer void decrease effect and the particle crushing effect dominant zone size was 1.50∼3.46% from triaxial test result of Sabkha layer.

Keywords
Sabkha
Particle crushing
Carbonate sand
Porewater pressure
Triaxial test

중동지역 Sabkha층 탄산질 모래는 패각류가 퇴적되어 생성되었으며, 내부간극을 포함한 다공질의 입자로 구성되어있다. 일반적으로 흙은 항복하중에서 구조가 파괴되어 간극수압 및 침하량이 급격히 증가하게 된다. 그러나 석영질 모래와는 달리 탄산질 모래의 경우 항복하중에 따른 입자파쇄시 내부간극이 외부로 노출되어 간극수압이 감소 될 수 있다. 탄산질 모래에서 발생된 과잉간극 수압은 하중 재하시 상대밀도 증가로 인한 과잉간극수압과 입자파쇄에 따른 내부간극 노출로 인한 과잉간극수압, 파쇄입자의 재배열로 인한 과잉간극 수압의 합에 의해 결정되며, 내부간극의 노출량에 따라 음(-)의 값이 나타날 수 있다. 입자파쇄량이 크면 간극수압이 작게, 입자파쇄량이 작으면 간극수압이 크게 나타난다. 삼축압축시험 결과 음(-)의 간극수압이 나타난 구간은 외부간극 감소에 비해 입자파쇄가 우세한 영역이며, 현장 Sabkha층에서 확인된 입자파쇄 우세 영역의 크기는 1.50∼3.46%의 값을 나타내었다.

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16
Received : July 18th, 2013
17
Revised  : December 19th, 2013
18
Accepted : February 19th, 2014
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 30
  • No :2
  • Pages :19-32
  • Received Date : 2013-07-18
  • Revised Date : 2013-12-19
  • Accepted Date : 2014-02-19
  • DOI :https://doi.org/10.7843/kgs.2014.30.2.19
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