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2026 Vol.27, Issue 9 Preview Page
A Study on the Determination of Optimal PBD Spacing for Reservoir Construction on Soft Ground

연약지반 상 저수지 축조를 위한 PBD 최적 배치간격 선정 연구

Woocheol Jeong1
,
Jongseung Kim2
,
Changjun Kim3
,
Seungjoo Lee4
,
Hoon Choi5
,
Gyeongho Lee6
,
Yongsoo Kim7
,
Yongseong Kim8*
정 우철1
,
김 종승2
,
김 창준3
,
이 승주4
,
최 훈5
,
이 경호6
,
김 용수7
,
김 용성8*
1Ph.D, Dept. of Regional Infrastructure Engineering, Kangwon National University
2Master Program, Dept. of Regional Infrastructure Engineering, Kangwon National University
3Integrated M.S.-Ph.D Program, Dept. of Regional Infrastructure Engineering, Kangwon National University
4Korea Institute of Civil Engineering and Building Technology
5Ph.D. Program, Department of Regional Infrastructure Engineering, Kangwon National University
6Ph.D. Program, Department of Regional Infrastructure Engineering, Kangwon National University
7Ph.D. Program, Department of Regional Infrastructure Engineering, Kangwon National University
8Professor, Dept. of Regional Infrastructure Engineering, Kangwon National University
*Corresponding Author
1 September 2026. pp. 13-24
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Abstract

This study evaluated the consolidation behavior and economic feasibility of Plastic Board Drain (PBD) spacing for reservoir construction on soft ground, considering staged embankment construction and the structural requirements for subsequent impoundment and operation. Numerical analyses were conducted for various PBD spacing conditions and a case without PBD installation to compare settlement, degree of consolidation, and the time required to reach 90 % consolidation. The applicability of the numerical results was examined using field monitoring data and centrifuge model test results. The results showed that narrower PBD spacing shortened the horizontal drainage path, accelerated consolidation during the early stages of embankment construction, and reduced the time required to reach 90 % consolidation. In contrast, wider spacing or no PBD installation delayed consolidation and prolonged settlement. Economic analysis showed that narrower spacing increased construction costs but enabled earlier reservoir operation and greater operating benefits. Considering both construction cost and operating benefit, the highest net benefit was obtained at a spacing of 1.4 m. Accordingly, a PBD spacing of approximately 1.4–1.5 m was considered a reasonable range for balancing consolidation performance and economic feasibility under the conditions examined in this study.

Keywords
PBD
Soft ground
Reservoir
Consolidation
Settlement
Optimal spacing

본 연구에서는 연약지반 상에 축조되는 저수지를 대상으로 단계성토 및 성토 완료 후 담수와 운영이 요구되는 구조물 특성을 고려하여 PBD(Plastic Board Drain) 배치간격에 따른 압밀거동과 경제성을 분석하였다. 다양한 PBD 배치간격과 미설치 조건에 대한 수치해석을 수행하여 침하량, 압밀도 및 압밀도 90 % 도달시간을 비교하였으며, 현장계측자료와 원심모형실험 결과를 이용하여 해석 결과의 적용성을 검토하였다. 분석 결과, PBD 배치간격이 감소할수록 수평배수거리가 단축되어 성토 초기의 압밀이 촉진되고 압밀도 90 % 도달시간이 단축되었다. 반면, 배치간격이 증가하거나 PBD를 설치하지 않은 경우에는 압밀 진행이 지연되어 장기침하가 지속되는 경향을 보였다. 경제성 분석에서는 배치간격 감소에 따라 공사비가 증가하였으나, 압밀 완료시점이 앞당겨져 운영이익이 증가하는 상충관계가 나타났다. 공사비와 운영이익을 종합적으로 고려한 결과, 1.4 m에서 가장 높은 순편익이 나타났으며, 대상 저수지 조건에서는 약 1.4~1.5 m의 PBD 배치간격이 압밀성능과 경제성을 함께 고려한 합리적인 범위로 평가되었다.

키워드
PBD
연약지반
저수지
압밀
침하
최적 배치간격
References
1

An, B. J. (2010), Characteristics of PBD Improvement in Soft Ground at Busan New Port, Ph.D. Dissertation, Hanyang University (in Korean).

2

Barron, R. A. (1948), Consolidation of fine grained soils by drain wells, ASCE, Transaction, Vol. 113, No. 4, pp. 718~754.

10.1061/TACEAT.0006098
3

Choi, G. B. (2008), Practice and problems in soft ground improvement construction, Korean Geotechnical Society 2008 Fall Conference, pp. 672~679 (in Korean).

4

Hansbo, S. (1981), Consolidation of fine-grained soils by prefabricated drains, Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, Vol. 3, pp. 677~682.

5

Jeong, H. B. (2020), A Prediction Method for Settlement of Soft Ground Improved by Vertical Drain Method in the Nakdong River Estuary Area, Ph.D. Dissertation, Changwon National University (in Korean).

6

Kim, D. H. (2017), Economic Analysis of Railway Roadbed Construction Using Embankment-Support Piles on Soft Ground, Master’s Thesis, Seoul National University of Science and Technology (in Korean), Statistics Korea, Korean Statistical Information Service (KOSIS),

7

Lee, G. Y. (2012), Analysis of the Combined Discharge Capacity Effect of PBD Considering Field Conditions, Ph.D. Dissertation, University of Seoul (in Korean).

8

Statistics Korea, Korean Statistical Information Service (KOSIS), (2022), Farm Household Economy Survey: Crop Receipts and Agricultural Income by Cultivated Land Size (in Korean).

9

Terzaghi, K. (1943), Theoretical Soil Mechanics, John Wiley & Sons, New York.

10.1002/9780470172766
Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 27
  • No :9
  • Pages :13-24
  • Received Date : 2026-06-02
  • Revised Date : 2026-06-16
  • Accepted Date : 2026-08-13
  • DOI :https://doi.org/10.14481/jkges.2026.27.9.13
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