Analysis of the radial and tangential soil pressure on pipes installed by the pipe jacking method in the Aburrá Valley
Otálvaro Velásquez, Sergio Andrés
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In the pipe jacking design, it is required the estimation of radial and tangential pressures exerted by soil on pipes, to determine the jacking forces that need to be achieve to overcome the frictional resistance during the installation process. This document presents theoretical methods that can be used to compute the external pressures on pipes and jacking forces, especially in cohesionless soils where the frictional component is determinant in the jacking process. In addition, several analyses are presented of how these calculations are affected by the variability of the geotechnical parameters of soils in the Aburrá Valley. Additionally, a comparison between computed values and field data recorded from two projects developed in the Aburrá Valley are presented, in order to analyze how well the computed values, approximate the real data. The comparison showed that theoretical models tend to overestimate the real behavior recorded in the projects, however, this overestimation provide a safety factor that must be optimized by the designer of a future pipe jacking project.