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Mathematical Problems in Engineering
Volume 2019, Article ID 3960864, 24 pages
https://doi.org/10.1155/2019/3960864
Research Article

Influence of Backfill Compaction on Mechanical Characteristics of High-Density Polyethylene Double-Wall Corrugated Pipelines

Hongyuan Fang,1,2,3 Peiling Tan,1,2,3 Bin Li,1,2,3 Kangjian Yang,1,2,3 and Yunhui Zhang1,2,3

1School of Water Conservancy and Engineering, Zhengzhou University, Zhengzhou 450001, China
2National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology, Zhengzhou 450001, China
3Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety, Henan Province, Zhengzhou 450001, China

Correspondence should be addressed to Peiling Tan; moc.361@2001132571lpt

Received 23 June 2019; Revised 16 September 2019; Accepted 3 October 2019; Published 31 October 2019

Academic Editor: Emilio Turco

Copyright © 2019 Hongyuan Fang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

For flexible pipelines, the influence of backfill compaction on the deformation of the pipe has always been the focus of researchers. Through the finite element software, a three-dimensional soil model matching the exterior wall corrugation of the high-density polyethylene pipe was skillfully established, and the “real” finite element model of pipe-soil interaction verified the accuracy through field test. Based on the model, the strain distribution at any position of the buried HDPE pipe can be obtained. Changing the location and extent of the loose backfill, the strain and radial displacement distributions of the interior and exterior walls of the HDPE pipe under different backfill conditions when external load applied to the foundation were analyzed, and the dangerous parts of the pipe where local buckling and fracture may occur were identified. It is pointed out that when the backfill is loose, near the interface between the backfill loose region and the well-compacted region, the maximum circumferential strain occurs frequently, the exterior wall strain is more likely to increase greatly on the region near crown or invert, the interior wall strains increase in amplitude at springline, and the location of the loose region has a greater influence on the strain of the pipe than the size of the loose area.