Pipelines 2020
Parametric Study on Ground Settlement of Sand and Clay Layer Due to Horizontal Directional Drilling
Publication: Pipelines 2020
ABSTRACT
With origins in the oil and gas industry, horizontal directional drilling (HDD) has become a popular trenchless technology for installing underground utility lines in urban areas with minimal damage to the existing infrastructures such as roadways. However, the surface settlement might occur due to ground loss during the installation of pipe depending on the size and type of pipe, diameter of borehole, and soil type. While studies have reported issues due to HDD installation in regard of borehole collapse, few studies have mentioned about the surface settlement. Numerical simulation, especially finite element analysis, is often used as an effective method to minimize heave and subsidence induced damage and to improve HDD operation. The present study considers investigating the effect of different soil types; its cohesion, friction angle, modulus of elasticity, Poisson’s ratio, and the borehole size in regard to surface settlement in a numerical environment. With a view to selecting an optimal depth for safe installation and least surface settlement, the paper investigates both sandy and clay soil conditions with different construction depth and different pipe sizes. The results show that cohesion and cover depth have a large influence on ground settlement whereas friction angle and modulus of elasticity have relatively smaller effect. The study also discusses the stress redistribution in soil due to the arching effect. During the study, the settlement was considered as high risk when it reached a value of 0.5 in. while 0.1 in. settlement was reported as safe.
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Published In
Pipelines 2020
Pages: 530 - 539
Editors: J. Felipe Pulido, OBG, Part of Ramboll and Mark Poppe, Brown and Caldwell
ISBN (Online): 978-0-7844-8320-6
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Aug 6, 2020
Published in print: Aug 6, 2020
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