Yun Zeng1, Jie Zhang1, Rui Xie This email address is being protected from spambots. You need JavaScript enabled to view it.2, Ting Zheng1, Hui Dong3, Xiaobo Liu4, and Xiaohua Chen5
1School of Mechatronic Engineering, Oil and Gas Equipment Technology Sharing and Service Platform of Sichuan Province, Southwest Petroleum University, Chengdu 610500, China 2Dazhou Industrial Technology Institute of Intelligent Manufacturing, Dazhou 635000, China 3Sichuan Vocational College of Information Technology, Intelligent Control Academy, guangyuan 628040, China 4Kunming Oil and Gas Transmission Branch of Southwest Pipeline Company, National Pipe Network Group, Kunming 650000, China 5National Pipe Network Group Southwest Pipeline Co., Ltd., Chenqdu 610094, China
Received: August 20, 2022 Accepted: December 12, 2022 Publication Date: March 9, 2023
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
Expanded polystyrene (EPS) geofoam is a light and deformable geosynthetic that can reduce the pressure on the pipe by surrounding soil. The protective effect of geofoam bocks protection on the buried pipe under stratum settlement was investigated. The effect of settlement displacement, diameter-thickness ratio, internal pressure, surrounding soil, and EPS thickness on the axial strain and ovalisation of pipe were analyzed. The results show that the axial strain and ovalisation of pipe protected with EPS are smaller than that in soil. With the increase of the pipe diameter-thickness ratio, the axial strain and ovalisation of pipe with or without protection increase. With the increase of internal pressure, the buckling mode of pipe buried in soil changes from collapse to wrinkle gradually, but the ovalisation changes of pipe protected with EPS is small. When the surrounding soil is rock, buckling occurred in the without protection is more obvious. The safety of the pipeline is better with thicker EPS.
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