The generalized Hough transformmethod is applied to the measurement of the diameters of buried cylindrical pipes by Ground Penetration Radar (GPR). 600 MHz radar scans across long pipes, buried in one metre or so of soil, show complex reflection patterns consisting of a series of inverted hyperbolic arcs. The time of flight t(y) as the radar probe is scanned along an axis, y, perpendicular to t...

the safety of buried pipes under repeated load has been a challenging task in geotechnical engineering. in this paper artificial neural network and regression model for predicting the vertical deformation of high-density polyethylene (hdpe), small diameter flexible pipes buried in reinforced trenches, which were subjected to repeated loadings to simulate the heavy vehicle loads, are proposed. t...

An experimental study was carried out to investigate seabed-pipeline interactions with regard soil liquefaction. For a high proportion (30 60%) of fine sediment, four groups tests were configured reproduce liquefaction around pipelines for different initial pipe depths, densities and wave conditions (wave height period). The focused on verifying the theoretically computed areas failure by analy...

Axisymmetric acoustic wave-modes propagating along buried water pipes have been investigated by the method of finite elements and experimentally. High precision dispersion relations are presented in this paper as a function of the geometry, the embedding material and the elastic modulus of the pipes. It is found that at low frequencies the fundamental axisymmetric acoustic mode of the water cyl...

A series of full-scale experiments was conducted to estimate lateral soil constraints on pipes buried in dense sandy slopes at different burial depths. The experimental data indicated that the force pipe increases with increase slope grade and depth ratio. against relative displacement response observed from is presented compared those arising level ground conditions. study extended larger rati...