Belastung und Verformung von Kunststoffrohren in sandigem Boden

Liquids and gases are usually conducted via pipelines. Buried pipelines are used in sanitary environmental engineering, agriculture or estate drainage. The pipe dimension and pipe geometry depend on static and hydraulic demands. Flexible plastics pipes are regarded as cost-efficient in laying and service due to the low self-weight and high chemical resistance of the material. Deformation, stability and watertightness are under consideration. While many authors are concerned with the investigation of deformation, only a few are discussing the reasons of deformation comprehensibly. Moreover, the pressure load of a buried pipeline is unexplained. Even though a complete and traceable description of the force-deflection behaviour is still missing, buried pipelines are determined statically. The calculations are usually made as suggested in guideline ATV-DVWK-A 127 by the German Association for Water, Wastewater and Waste. The object of this dissertation is the experimental identification of the pressure loading and deformation of flexible pipes under different boundary conditions and the numerical treatment. Two large-scale simulation tests are described, investigating the entire load history. The realized experiments are able to explain the time-dependent force-deflection behaviour of flexible pipes. It turns out that pressure loading and deformation of a pipeline are strongly affected by the compaction of the soil. The numerical treatment uses the Finite-Element-Method. The time-temperature-dependent behaviour of the unplasticized PVC is represented by the theory of linear viscoelasticity. The matter constants are derived from creep tests at different temperatures. The mechanical properties of loose and dense granular materials are represented by a hypoplastic constitutive law. The matter constants are derived from triaxial tests. Good results are obtained in simulating the installation and compaction of each soil layer in the trench. Finally, the guideline ATV-DVWK-A 127 is reviewed. The assumptions made in this guideline do not bear comparison with the test results presented in this thesis, essentially because the compaction is not considered as a loadcase.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2009

Author dc:creator

• Kammerdiener, Heinrich

Contributors dc:contributor

• Güldenpfennig, Jürgen

• info:eu-repo/classification/ddc/620
• Belastung
• Mechanische Beanspruchung
• Rohr
• Deformation
• Viskoelastizität
• Plastizität
• Polyvinylchlorid
• Nichtbindiger Boden
• Ingenieurwissenschaften
• Hypoplastizität
• Siedlungswasserwirtschaft
• ATV A 127
• loading
• flexible pipe
• viscoelasticity
• hypoplasticity

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-112730%22

OAI record oai:identifier

https://publications.rwth-aachen.de/oai2d?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Apublications.rwth-aachen.de%3A50175