Experimental Study on Creep Characteristics of Saturated Q2 Loess

Catastrophic failures often occur to engineered infrastructure in areas underlain by saturated loess due to its high moisture content (degree of saturation >85%), low shear strength, and large deformation. Time effect (rheological property) and water are the most important factors affecting the m...

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Bibliographic Details
Published inFrontiers in earth science (Lausanne) Vol. 10
Main Authors Liu, Xiaowei, Zhang, Xudong, Fu, Xiaogang, Yang, Tianxiang, Su, Zisong
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 25.01.2022
Subjects
burgers model
creep
flow failure
saturated loess
step load
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Summary:Catastrophic failures often occur to engineered infrastructure in areas underlain by saturated loess due to its high moisture content (degree of saturation >85%), low shear strength, and large deformation. Time effect (rheological property) and water are the most important factors affecting the mechanical properties of saturated loess. The rheological mechanism and characteristics of saturated loess are vital to understanding the interaction between infrastructure and foundation and the trigger of failures. Based on step-load testing, this study obtains the displacement-time relationship of saturated Q 2 loess to analyze its creep behavior. Experimental results show that the creep strength of saturated Q 2 loess is 75–80% of its unconfined compression strength, and the creep behavior can be simulated by the Burgers model. Additionally, the rheological parameters under different load conditions are obtained using the improved Marquardt iterative method. All these parameters can be used for numerical analysis of the rheological behavior of saturated Q 2 loess.
ISSN:2296-6463
2296-6463
DOI:10.3389/feart.2022.815275