Abstract
Repair of deteriorated sewer pipes is now often undertaken by installing a tight fitting thin-walled polymeric lining inside the cracked/deformed host pipe. It is demonstrated that structural design of these systems is most appropriately focused on proving a suitable factor of safety against long term creep buckling of the lining subject to external groundwater pressure within the confines of the host pipe. A programme of research identifying the appropriate performance criteria is then described. Firstly a suitable means of defining the required long term constitutive behaviour is considered. Secondly a series of laboratory tests which enable system behaviour to be defined is described. Finally a finite element model is developed, capable of predicting the required time dependent, highly nonlinear, long term system behaviour, and which therefore provides a suitable basis for the development of appropriate design guidelines.
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