EXPERIMENTAL AND NUMERICAL INVESTIGATION OF FLEXIBLE BURIED PIPE DEFORMATION BEHAVIOR UNDER VARIOUS BACKFILL CONDITIONS
Öz
Deformation characteristics of polyethylene based flexible pipes are different than rigid pipes such as concrete and iron pipes. Deflection patterns and stress-strain behaviors of flexible pipes have strict relation between the engineering properties of backfill and its settlement method. In this study, deformation behavior of a 100 mm HDPE flexible pipe under vertical loads is investigated in laboratory conditions. Steel test box, pressurized membrane, raining system, linear position transducers and strain gauge rosettes are used in the laboratory tests. In order to analyze the buried pipe performance; Masada Derivation Formula which is mostly used by designers is employed. According to the test and mathematical studies, it is understood that relative density of backfill and its settlement method is a considerable effect on buried pipe performance and Masada Derivation method is very efficient for predicting the pipe performance.
Anahtar Kelimeler
HDPE buried flexible pipe Laboratory test Masada derivation formula.
Kaynakça
- Adalier, K. 1992. Post-Liquefaction behavior of soil systems. Master Thesis. Rensselaer Polytechnic Institute. Troy, N.Y.
- AASTHO. 1996. Standart specification for highway bridges. 16th Edition American Association of State Highway and Transportation Officials,Washington;
- Annual Book of ASTM. 2001. Standard, Plastics (III). Ahn, W. S. 1998. An experimantal and analytical investigation of viscoelastic pipe-soil interaction. Phd Thesis Florida Atlantic Univesity Florida.
- Brachman, R.W.I. 1999. Structural performance of leachete collection pipes. PhD Thesis, Department of Civil and Enviromental Eng. University of Western Ontario. Kanada.
- Burns, J., Q. and Richard., R. M. 1964. Attenuation of stresses for buried cylinders. Proc. of Soil Symposium on Soil-Structure Interaction, Univ. of Arizona. pp 379-392.
- Cameron, D. A. 2005. Analysis of buried flexible pipes in granular backfill subjected to construction traffic. Ms Thesis University of Sydney., Australia.
- Chua, K. M. 1986. Time-dependent interaction of soil and flexible pipe” Phd Thesis Texas A&M University of Texas.
- Daley, J. W. and Riley, W. F. 1978. Experimental strain analysis. McGraw-Hill; New York.
- Hoeg, K. 1968. Stress against underground structural cylinders” Journal of the Soil Mechanics and Foundations Div. ASCE Vol 94 NSM4. pp. 833858.
- Kawabata, T. 2002. Earth pressure distribution for buried pipe bend subject to internal pressure beneath our feet., Challenges and Solutions Pipeline Division Specialty Conference.
- Smith, M. E. 2004. Drainage pipe deflection for high heaps., Published in Mining Record 4th
- Marston, A. and Anderson A.O. 1913. The theory of loads on pipes in ditches and tests of cement and clay. Drain Tile and Sewer Pipe Bulletin Number 47 Iowa State College.
- Marston, A. 1930. Iowa Engineering Experiment Station. Bulliton No: 6 Ames, Iowa.
- Masada, T. 1996. Structural performance of profile wall plastic pipes under relatively shallow soil cover and subjected to large surface laod” Phd Thesis., College of Eng. Technology Ohia University., Ohio
- Rogers, C.D.F. 1988. Some observations on flexible pipe response load” Transportation Research Record 1191. pp. 1-11
- Spangler, M. G. 1941. Structural design of flexible pipe culverts. Iowa Engineering Experiment Station, Bulletin No. 153.
- Watkins R. K. 1966. Structural design of buried circular conduits, Highway Reseach Record. No 145, Paper Sponsored by Committee on Buried Structures and Presented at 45th Annual Meeting. USA.
FARKLI ZEMİN ORTAMLARINA YERLEŞTİRİLEN ESNEK GÖMÜLÜ BORULARIN DÜŞEY YÜKLER ALTINDAKİ ŞEKİL DEĞİŞİMİMİN DENEYSEL VE AMPRİK YÖNTEMLERLE İNCELENMESİ
Öz
Esnek boruların şekil değişimi ve zamana bağlı davranış biçimleri çelik ve betondan malzemelerden üretilen rijit borular ile kıyaslandığında bir çok yönden farklılıklar gösterir. Düşey yükler altındaki deformasyon davranışları; geri dolgu mazlemesi ve yerleştirme koşulları ile doğrudan ilişkilidir. Bu çalışmada 100 mm yarıçapındaki bir HDPE esnek borunun düşey yükler altındaki davranışı labaratuvar ortamında incelenmiştir. Çalışmalarda, deney kutusu, şişebilen membran yastıklar, yağmurlama sistemi, pozisyon ve şekil değişimi ölçerler kullanılmıştır. İnceleme kapsamında farklı zemin ortamları dikkate alınmıştır. Matematiksel analizler için Geliştirilmiş Iowa yöntemini temel alan Masada Derivasyonu kullanılmış ve deney sonuçları ile matematiksel sonuçlar birbirleri ile karşılaştırılmıştır. Yapılan değerlendirmeler sonucunda geri dolgu malzemesinin boru davranışında önemli bir etken olduğu görülmüş, Masada Derivasyonunun boru dayanımının kestiriminde güvenilir çözümler ortaya koyduğu saptanmıştır.
Anahtar Kelimeler
HDPE gömülü boru Labaratuvar testi Masada derivasyonu formülü.
Kaynakça
- Adalier, K. 1992. Post-Liquefaction behavior of soil systems. Master Thesis. Rensselaer Polytechnic Institute. Troy, N.Y.
- AASTHO. 1996. Standart specification for highway bridges. 16th Edition American Association of State Highway and Transportation Officials,Washington;
- Annual Book of ASTM. 2001. Standard, Plastics (III). Ahn, W. S. 1998. An experimantal and analytical investigation of viscoelastic pipe-soil interaction. Phd Thesis Florida Atlantic Univesity Florida.
- Brachman, R.W.I. 1999. Structural performance of leachete collection pipes. PhD Thesis, Department of Civil and Enviromental Eng. University of Western Ontario. Kanada.
- Burns, J., Q. and Richard., R. M. 1964. Attenuation of stresses for buried cylinders. Proc. of Soil Symposium on Soil-Structure Interaction, Univ. of Arizona. pp 379-392.
- Cameron, D. A. 2005. Analysis of buried flexible pipes in granular backfill subjected to construction traffic. Ms Thesis University of Sydney., Australia.
- Chua, K. M. 1986. Time-dependent interaction of soil and flexible pipe” Phd Thesis Texas A&M University of Texas.
- Daley, J. W. and Riley, W. F. 1978. Experimental strain analysis. McGraw-Hill; New York.
- Hoeg, K. 1968. Stress against underground structural cylinders” Journal of the Soil Mechanics and Foundations Div. ASCE Vol 94 NSM4. pp. 833858.
- Kawabata, T. 2002. Earth pressure distribution for buried pipe bend subject to internal pressure beneath our feet., Challenges and Solutions Pipeline Division Specialty Conference.
- Smith, M. E. 2004. Drainage pipe deflection for high heaps., Published in Mining Record 4th
- Marston, A. and Anderson A.O. 1913. The theory of loads on pipes in ditches and tests of cement and clay. Drain Tile and Sewer Pipe Bulletin Number 47 Iowa State College.
- Marston, A. 1930. Iowa Engineering Experiment Station. Bulliton No: 6 Ames, Iowa.
- Masada, T. 1996. Structural performance of profile wall plastic pipes under relatively shallow soil cover and subjected to large surface laod” Phd Thesis., College of Eng. Technology Ohia University., Ohio
- Rogers, C.D.F. 1988. Some observations on flexible pipe response load” Transportation Research Record 1191. pp. 1-11
- Spangler, M. G. 1941. Structural design of flexible pipe culverts. Iowa Engineering Experiment Station, Bulletin No. 153.
- Watkins R. K. 1966. Structural design of buried circular conduits, Highway Reseach Record. No 145, Paper Sponsored by Committee on Buried Structures and Presented at 45th Annual Meeting. USA.
Ayrıntılar
| Birincil Dil | Türkçe |
|---|---|
| Bölüm | Makale |
| Yazarlar | |
| Yayımlanma Tarihi | 1 Ocak 2009 |
| Yayımlandığı Sayı | Yıl 2009 Cilt: 15 Sayı: 1 |
