Year: 2014
Type: conference-paper
Abstract: Composite shell linings, consisting of a layer of permanent sprayed concrete primary lining, a layer of spray applied waterproofing membrane and a layer of sprayed or cast secondary lining, represent the latest development in the tunnelling industry.While demand for these linings is increasing, there are still some unknowns associated with their design.One of the biggest areas of uncertainty is the extent of composite action in the interfaces between the waterproofing membrane and the primary and the secondary linings.A research programme is in progress at the University of Southampton, UK, to investigate the behaviour of composite shell tunnels, focusing on the interfaces' properties.Short-term four-point bending tests have been carried out on beam samples cut from panels built up from a sprayed primary layer, spray applied waterproofing membrane and sprayed secondary layer with different interface finishes.The test results, including vertical displacements, horizontal strains and beam end relative displacements, of composite beams with different interface thickness and roughness are reported and compared.A composite action quantification method has been developed and is applied to the tested beams.The results show that a significant degree of composite action can be achieved by the composite beam with sprayed applied waterproofing membrane.
Authors: Jiang Su, Alan G. Bloodworth
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2590259089