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Research Article

A Study on Determination of the Degree of Consolidation and Time Factor Considering Site Ground Characteristics

현장 지반특성을 고려한 압밀도 및 시간계수 결정에 관한 연구

Min-Ju Choi1
,
Hung-Nam Kim2
,
Kang-Il Lee3*
최 민주1
,
김 흥남2
,
이 강일3*
1Member, Ph.D Candidate, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
2Member, Ph.D Candidate, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
3Member, Professor, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
*Corresponding Author
30 March 2022. pp. 23-32
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Abstract

This study is conducted to minimize the problems caused by the difference between the settlement and settlement time of the one-dimensional consolidation analysis by the Terzaghi’s consolidation theory, which is generally used in domestic soft soil design, from the settlement and settlement time measured at the field site. Consolidation-time factor considering the field site characteristics can be determined using the relationship among the degree of consolidation, settlement time, and time factor, the time-settlement curve measured at the field is reverse- analysis using a numerical-analysis technique to reproduce the same consolidation behavior as in the field. Time-settlement and time-excessive pore water pressure data when the same consolidation behavior as the site is reproduced Consolidation-time factor of the soil of Songsan Green City by settlement and excess pore water pressure was calculated using the settlement and excess pore water pressure for each settlement time. If the results of this study use the Terzaghi consolidation-time factor, which does not consider the consolidation characteristics of the soft ground target area, it is difficult to determine the end time of the soft ground during construction. It is necessary to use the established settlement-time factor.

Keywords
Soft ground
Degree of consolidation
Time factor

본 연구는 국내 연약지반 설계에서 일반적으로 사용되고 있는 Terzaghi 압밀이론에 의한 1차원 압밀해석의 침하량 및 침하시간이 실제 현장에서 측정되는 침하량 및 침하시간과의 차이로 인해 발생하는 문제점을 최소화하고자 수행하였다. 현장 지반특성을 고려한 압밀도-시간계수는 압밀도, 침하시간, 시간계수의 관계를 이용하여 결정할 수 있으므로 현장에서 측정된 시간-침하량 곡선을 현장과 동일한 압밀거동이 재현될 때의 수치해석기법으로 역해석하였다. 현장과 동일한 압밀거동이 재현될 때의 시간-침하량과 시간-과잉간극수압 데이터로 각 침하시간에 대한 침하량과 과잉간극수압을 이용하여 침하량과 과잉간극수압에 의한 송산그린시티 지반의 압밀도-시간계수를 산정하였다. 본 연구결과 연약지반 대상지역의 압밀특성이 고려되지 않은 Terzaghi 압밀도-시간계수를 사용한다면 시공시 연약지반 종료시기를 결정하는데 어려움이 있으며 압밀특성이 고려된 압밀도-시간계수를 사용할 필요가 있다.

References
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 21
  • No :1
  • Pages :23-32
  • Received Date : 2022-02-22
  • Revised Date : 2022-03-22
  • Accepted Date : 2022-03-22
  • DOI :https://doi.org/10.12814/jkgss.2022.21.1.023
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