Finite element calculations of stresses and deformations in buried flexible pipes.

Abstract

The objectives of this thesis are (1) to measure the characteristics of an interface between a granular soil and a Polyvinyle Chloride (PVC) surface, (2) to use those characteristics as input parameters for interface elements in a finite element analysis, and (3) to evaluate the effects of interface strength on the behaviour of buried flexible pipe. The work is divided into four main parts. First, a comprehensive literature survey was done for the behaviour of interfaces and for some well-known analytical techniques available for underground flexible pipe structures. Second, an experimental program involving an interface between a PVC plate and stone dust was undertaken. The effects of various parameters such as surface roughness, number of load cycles, normal stress and relative density were investigated Third, numerical analyses were done in order to evaluate the erects of ire elements on the behaviour of a 1500-mm Fibre Reinforced Plastic (FRP) pipe and a 900-mm PVC pipe. Finally, the results of the numerical analyses were compared with those of well known analytical methods. (Abstract shortened by UMI.)