Comprehensive review of structural deterioration of water mains: physically based models

The transverse response of underground cylindrical cavities to incident SV waves is investigated. Analytical solutions are derived for unlined cavities embedded within an elastic half-space using Fourier–Bessel series and a convex approximation of the half-space free surface. The computed displacements at the half-space free surface and the tangential stresses on the cavity are compared with the results of previous investigations. The analytical solutions are extended to formulate approximate solutions for assessing hoop stresses within cavity liners impinged by low-frequency waves having wavelengths much longer than the cavity diameter. The approximate solutions are compared to existing numerical solutions, and used to evaluate the dynamic response of a flexible buried pipe shaken by the 1994 Northridge earthquake. The proposed approximate model for cavity liners is useful for the seismic analysis of underground pipes and small-diameter tunnels. Copyright © 2001 John Wiley & Sons, Ltd.

Transverse response of underground cavities and pipes to incident SV waves

Analysis of buried pipelines subjected to reverse fault motion

Internal blast loading in a buried lined tunnel

The aim of this study was the comparison of the stiffness of different meshes under two types of mechanical tests Five different mesh types were mechanically tested The methods used consisted on uniaxial tension test (tensile stiffness) and tape ring tests, experimental continuous compression of the mesh loops (flexural stiffness) The most significant difference of tensile stiffness behaviour appears between Aris™ and TVTO™ From the analysis of the experimental data, we divided the flexural stiffness, in two main groups The first group includes Auto Suture™ and Aris™ meshes The two meshes seem to have a similar flexural behaviour The second group includes TVTO™, Uretex™ and Avaulta™ The difference between these two groups is clearly evident comparing TVTO™ and Aris™ This study shows that there are significant differences on the mechanical properties between urogynecology meshes

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Mechanical properties of polypropylene mesh used in pelvic floor repair

Introduction and Overview External Loads Design of Gravity Flow Pipes Design of Pressure Pipes Buried Pipe Products

A P Moser

Papers

Buried Pipe Design