Title: Evaluation of in-soil creep characteristics of HDPE geogrid using the time-stress superposition method

Authors: Guangqing Yang; Qiaoyi Li; Zhijie Wang; He Wang

Addresses: State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Key Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei, China ' School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei, China ' State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Key Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei, China ' State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Key Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei, China

Abstract: The tensile creep characteristics of geogrids in-soil were studied by using a self-designed creep test device. To study the influence of normal stress on the tensile creep characteristics of geogrids, creep tests were carried out at three tensile stress levels. The restraint of normal stress can reduce the creep strain of a geogrid. The HDPE geogrids exhibited primary and secondary creep stages under restraint. According to the principle of time stress superposition, the creep strain time curves under three different tensile stress levels were moved along the logarithmic time axis to obtain the master strain curve at a given reference stress level. Based on the 500 hours creep test data, the principal curve was used to predict the creep characteristics up to 100 years by the time stress superposition principle.

Keywords: geogrid; tensile creep; in-soil; time stress superposition; master strain curve.

DOI: 10.1504/IJMPT.2022.125513

International Journal of Materials and Product Technology, 2022 Vol.65 No.3, pp.224 - 234

Received: 01 Sep 2020
Accepted: 20 Apr 2021
Published online: 13 Sep 2022 *

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