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2018 Vol.17, Issue 4 Preview Page

Research Article

Discharge Capacity of Prefabricated Vertical Drain Confined In-Clay Under Long-Term Conditions

연직배수재 타설 후 장기간 경과된 지반의 통수성능

Sang-Guk Jeong1*
정 상국1*
1Member, Professor, Department of Civil Engineering, Songwon University, 73 Songam-ro, Nam-gu, Gwangju 61756, Republic of Korea
* Corresponding Author
30 December 2018. pp. 239-249
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Abstract

Typically, soft clay improvement is carried out using installation of PVD and surcharge method. According to circumstances, installed PVD has left for a long time due to the change in construction schedule. Therefore, for simulation of this kind of condition, discharge capacity tests were carried out under a series of temperature condition (30, 35, 40°C). The results indicated that under water confinement, the discharge capacities significantly reduced with elapsed time. And, the empirical equation by Miura and Chai (2000) was used for estimating the long-term in-clay discharge capacity. Based on the test results, it is recommended that in term of long-term discharge capacity, Miura and Chai’s equation and reliability evaluation using discharge capacity tests under a series of temperature condition may be used.

Keywords
Long-term in-clay discharge capacity
Temperature condition, PVD

연약점토 지반 개량을 위해 연직배수재 타설 후 선행재하공법이 일반적으로 적용되는데, 현장에서의 시공계획 변경 등으로 인해 연직배수재 타설 후 장기간 방치되는 경우가 종종 발생된다. 따라서 장기간 방치된 조건에서의 연직배수재 열화 현상을 고려하기 위해 구속압으로 적용되는 수온을 각각 30, 35, 40°C를 적용하였다. 그 결과, 시간경과에 따라 배수성능이 급격히 저하되는 경향을 나타냈다. 그리고 현장 원위치 조건, 즉, 점토 구속조건하에서 장기간 통수능 저하 정도를 평가하기 위하여 Miura와 Chai(2000)식을 적용하였다. 그 결과, 온도 변화 조건에서 수행된 통수능 시험결과를 이용한 신뢰성 해석 방법과 Miura와 chai(2000)식을 적용하여 장기 통수능을 평가할 수 있는 것으로 평가되었다.

References
1
ASTM D4716 (2014), “Standard test method for determining the (in-plane) flow rate per unit width and hydraulic transmissivity of a geosynthetic using a constand head”.
2
Arrehenius, S. A. (1889), “Uber die Dissociationswarme und den Einfluss der Temperatur auf den Dissociationsgrad der Elektrolyte”, Zeitschrift fur Physikalische Chemie, Vol 4U, Issue 1, pp.96-116.
3
Chai, J. C. and Miura. N. (1999), “Investigation of factors affecting vertical drain behavior”, J. of Geotech. and Geoenvir. Engrg., ASCE, Vol.125, No.3, pp.216-226.
10.1061/(ASCE)1090-0241(1999)125:3(216)
4
Korea Reliability Certification Center (2016), “Prefabricated vertical drain board for soft ground improvement”, RS-KORAS-FITI-021.
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KS K 0940 (2008), “Test method for discharge capacity of plastic drain board”.
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KS K ISO 18325 (2017), “Geosynthetics-Test method for the determination of water discharge capacity for prefabriacated vertical drains”.
7
Miura. N., Chai, J. C. and Toyota, K. (1998), “Investigation on some factors affecting discharge capacity of prefabricated vertical drain”, Proceedings of 6th International Conference on Geosynthetics, Atlanta, pp.845-850.
8
Miura. N. and Chai, J. C. (2000), “Discharge capacity of prefabricated vertical drain confined in-clay”, Geosynthetics Journal, Japan Chapter of International Geosynthetics Society, Vol.15.
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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 : 17
  • No :4
  • Pages :239-249
  • Received Date : 2018-11-14
  • Revised Date : 2018-12-03
  • Accepted Date : 2018-12-17
  • DOI :https://doi.org/10.12814/jkgss.2018.17.4.239
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