Numerical Modeling of Installation of Steel-Reinforced High-Density Polyethylene Pipes in Soil
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 11
Abstract
Steel-reinforced high-density polyethylene (SRHDPE) pipe uses steel ribs to carry loads and plastic cover to prevent the steel ribs from corrosion so that it overcomes the disadvantages of steel and high-density polyethylene (HDPE) pipes. The SRHDPE pipe can be classified as a flexible pipe. Compaction is essential for flexible pipes to ensure their load carrying capacity. Numerical modeling is a useful tool to investigate the performance of the SRHDPE pipe during installation. However, two problems must be solved to properly simulate the installation of the SRHDPE pipe using the numerical method: (1) compaction pressure cannot be removed after the completion of the compaction; and (2) the SRHDPE pipe is a composite material (i.e., steel and plastic). In this study, the hardening soil model included in the finite-element software PLAXIS 2D was used to model the backfill material, which allowed the removal of the compaction pressure. A pressure of 80 kPa was applied on the surface of a 1.5 m wide and 1.4 m deep trench backfilled with aggregate to simulate compaction. The aggregate was modeled using the hardening soil model to estimate the residual pressure after the removal of the compaction pressure. An equivalent modulus method (EMM) was proposed to simulate the SRHDPE pipe in the numerical model. Parallel plate test results of the SRHDPE pipe were used to compare with the numerical and theoretical results to demonstrate the validity of the EMM. Finally, the test results of the SRHDPE pipe installation in the field were used to verify the effectiveness of the numerical method proposed in this study.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 11 • November 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Sep 16, 2016
Accepted: May 18, 2017
Published online: Aug 30, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 30, 2018
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