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2014 Vol.13, Issue 1
Design Improvement VE Case for Expansion of a Roadway over a Soft Soil

연약지반 도로확장공사 설계 개선에 따른 가치 평가 사례

Tae-Hyung Kim1*
,
Kook-Han Kim2
,
Young-Chu Choi3
,
Sa-Ik Lee4
,
Ji-Hoon Ruy5
김 태형1*
,
김 국한2
,
최 영철3
,
이 사익4
,
류 지훈5
1Professor, Department of Civil Engineering, Korea Maritime and Ocean Univ.
2General Manager, Naengjeong-Busan Construction Agency of the Korea Expressway Corporation
3 Senior researcher, Naengjeong-Busan Construction Agency of the Korea Expressway Corporation
4Manager, Naengjeong-Busan Construction Agency of the Korea Expressway Corporation
5Ph.D. Candidate, Department of Civil Engineering, Korea Maritime and Ocean Univ.
*교신저자. *Corresponding Author. 
30 March 2014. pp. 1-9
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Abstract

Expansion of a roadway on a soft ground can cause settlement of the existing road during embankment construction due to the consolidation characteristics of the soft soil. Many problems related to construction and maintenance, such as deterioration of the surface, decreased safety, and decreased structural stability, could affect the existing road. This scenario is especially true if the roadway foundation is a deep thick soft ground. Therefore, engineers should carefully select a proper design based on the characteristics of the soil layer. In this study, the expansion of the second branch of the Namhae Expressway was selected as the target site because this expressway has been constructing on a soft soil layer approximately 50 m thick. The original design was reviewed, problems were discussed and alternative was proposed through value engineering job plan phases: investigation, speculation, evaluation, development and presentation. In addition, the proposed alternative was evaluated on cost, function and value improvement. Compared to the original design, the proposed alternative saved cost and improved the function and overall value.

Keywords
Value engineering
Cost saving
Deep thick soft ground
Road expansion
Design

연약지반에서 도로 확장공사는 지반의 특성으로 인해 우선 시행되는 확장 부 성토 시 발생되는 침하로 기존고속도로에 연동침하가 발생된다. 이 경우 지반침하 및 변형에 의한 포장 평탄성 불량, 차량 주행 안전성 저하, 구조물 안정성 감소 등 시공 및 기존도로 유지관리에서 많은 어려움을 유발한다. 특히 대심도 연약지반에서는 이와 같은 문제가 발생될 수 있는 여지가 대단히 높다. 따라서 이러한 문제점이 고려된 설계가 이루어져야 할 것이다. 본 연구에서는 연약지반 분포심도 최대 약 50m가 존재하는 남해고속도로 제2지선 확장공사를 대상으로 설계 VE를 통해 원 설계안에 대한 현황 및 한계점을 파악한 후 아이디어 도출, 평가, 분석을 통해 개선안을 제시하였다. 또한 개선안에 대한 원가절감, 성능 및 가치향상 평가를 실시하였다. 평가 결과 원가 절감 효과가 발생하고, 기능 향상 효과도 발생하여 전체적으로 개선된 설계안이 원설계에 비해 가치가 향상되는 것으로 나타났다.

References
1
1.Cheong, Ha-Ik, Lee, Yong-Su, Cheong, Gil-Su, Jin, Hyeon-Sik, Cheong, Moon-Gyeong, Woo, Jae-Yoon, Cho, Sam-Deok, Kim, Young-Jin, Ahn, Tae-Bong, Kim, In-Dae, Koh, Gap-Su, Park, Young-Mok (1999), A Study of the Consolidation Characteristics of Soft Ground.
2
2.Cheong, Jong-Hong, Cho, Seong-Min, Kim, Hong-Jong, Cheong, Gyeong-Ja, Park, Joong-Gyu, Kim, Dong-Seung(2005), A Study of the Settlement Evaluation and Maintenance of Long-Term Settlement for the Highway on the Soft Grounds, Expressway & Transportation Research Institute.
3
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4
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8
8.Korea Expressway Corporation (2006), Report of Namhae Expressway Expansion Project.
9
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10
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11
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12
12.Korea Expressway Corporation (2012), A Study on the Deve-lopment of a Computer Aided VE System, p.80.
13
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14
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15
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16
16.West Virginia Department of Transportation (2004), Value Engineering Manual, p.187.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 13
  • No :1
  • Pages :1-9
  • Received Date : 2013-11-19
  • Revised Date : 2014-01-13
  • Accepted Date : 2014-01-16
  • DOI :https://doi.org/10.12814/jkgss.2014.13.1.001
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