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A Study on the Behavior of Buried Flexible Pipes with Soil Condition

지반조건에 따른 지중매설 연성관의 거동에 관한 연구

Hyoung-Kyu Lee1*
,
Joon-Seok Park2
이 형규1*
,
박 준석2
1Professor, Dept. of Civil Engineering Seoil Univ.
2Assistant Professor, Dept. of Civil Engineering Seoil Univ.
*교신저자. *Corresponding Author. 
30 March 2014. pp. 33-40
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Abstract

In general, pipes buried underground can be classified into either rigid or flexible pipe. Glass fiber reinforced thermosetting polymer plastic (GFRP) pipe can be considered as one of typical flexible pipes for which the soil-pipe structure interaction must be taked into account in the design. In this paper, we present the result of an investigation pertaining to the short-term and long-term behavior of buried GFRP pipe. The mechanical properties of the GFRP pipe produced in the domestic manufacturer are determined and the results are reported in this paper. In addition, Ring deflection is measured by the field tests and the finite element analysis. Also, the extrapolation using these techniques typically extends the trend from data gathered over a period of approximately 5,232 hours, to a prediction of the property at 50 years, which is the typical maximum extrapolation time. Therefore, it was investigated that the long-term ring deflection of GFRP pipe estimated by methods for Monod-type.

Keywords
GFRP pipe
Regression analysis
Finite element analysis
Short-term behavior
Long-term behavior

보통 지중에 매설되는 관은 강성관과 연성관으로 구분된다. 연성관 중 유리섬유강화플라스틱(Glass fiber reinforced thermosetting polymer plastic, GFRP)으로 이루어진 GFRP 관은 지중에 매설시 지반과 관의 상호관계를 고려하여 설계되어야 한다. 본 연구에서는 지중에 매설되는 GFRP 관의 장단기의 구조적 거동을 조사하고자 한다. 먼저, 국내에서 생산되는 GFRP 관의 역학적 성질조사를 하고, 현장매설실험과 유한요소해석을 수행하여 장기거동 예측에 대한 기초자료로 활용하였다. GFRP 관의 장기거동을 예측하기 위해 약 5,232시간 동안의 수직 관변형을 조사하였으며, 이를 바탕으로 최대 50년 동안의 관변형에 대하여 Monod-type 방법으로 예측하였다.

References
1
1.ASTM D 2412 (2010), Standard Test Method for Determination of External Loading Characteristics of Plastic Pipe by Parallel-Plate Loading, American Society for Testing and Materials.
2
2.Kim, E. H. (2011), Investigation of pipe deflection behavior and prediction of long-term ring deflection of GFRP pipe (φ 2,400mm) buried underground, Hongik University Research Institute of Science and Technology Research Report. Seoul, Korea. (In Korean)
3
3.Kim, S. H., Ok, D. M., An, D. J., Hong, W. H., and Yoon, S.-J. (2012), “Prediction of long-term ring deflection of buried GFRP pipe.” The 2nd International Conference on Advanced Polymer Matrix Composites.
4
4.Korea Water and Wastewater Works. (2010), Guideline of Sewer System, Korea. (In Korean)
5
5.KS M ISO 9969. (2008), Thermoplastics pipes-determination of ring stiffness, Korean Agency for Technology and Standards (KS), Seoul, Korea. (In Korean)
6
6.MIDAS/GTS. (2009), Analysis reference, MIDAS Information Technology Co., Ltd. (In Korean)
7
7.Park, J. S. (2012), A Study on the Ring Deflection Limitation of Buried Flexible Pipes, Ph.D Thesis, University of Hongik.
8
8.Timoshenko, S. P. and Gere, J. M. (1961), Theory of Elastic Stability, 2th Edition, McGraw-Hill, New York.
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 :33-40
  • Received Date : 2013-12-13
  • Revised Date : 2014-02-14
  • Accepted Date : 2014-02-17
  • DOI :https://doi.org/10.12814/jkgss.2014.13.1.033
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