Water Science and Engineering 2018, 11(2) 131-138 DOI:   https://doi.org/10.1016/j.wse.2018.07.003  ISSN: 1674-2370 CN: 32-1785/TV

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 Soft interlayer
Ring shear creep test
Rheological constitutive model
Water content
Chong Ma
Hong-bin Zhan
Wen-min Yao
Hua-zhou Li
Article by Chong Ma
Article by Hong-bin Zhan
Article by Wen-min Yao
Article by Hua-zhou Li

A new shear rheological model for a soft interlayer with varying water content

Chong Ma a,c, Hong-bin Zhan b,c,*,Wen-min Yao c, Hua-zhou Li c

a School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China
b Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843-3115, USA
c Faculty of Engineering, China University of Geosciences, Wuhan 430074, China


The rheological behavior of a soft interlayer is critical to understanding slope stability, which is closely related to the water content of the soft interlayer. This study used the soft interlayer of the Permian Maokou Formation in Southwest China as an example to perform ring shear creep tests with different water content amounts. The effect of water content on the creep properties of the soft interlayer was analyzed, and a new shear rheological model was established. This research produced several findings. First, the ring shear creep deformation of the soft interlayer samples varied with the water content and the maximum instantaneous shear strain increment occurred near the saturated water content. As the water content increased, the cumulative creep increment of the samples increased. Second, the water content significantly affected the long-term strength of the soft interlayer, which decreased with the increase of water content, exhibiting a negative linear correlation. Third, a constitutive equation for the new rheological model was derived, and through fitting of the ring shear creep test data, the validity and applicability of the constitutive equation were proven. This study has developed an important foundation for studying the long-term deformation characteristics of a soft interlayer with varying different water content.

Keywords  Soft interlayer   Ring shear creep test   Rheological constitutive model   Water content  
Received 2017-05-02 Revised 2018-01-13 Online: 2018-04-30 
DOI: https://doi.org/10.1016/j.wse.2018.07.003

This work was supported by the National Natural Science Foundation of China (Grants No. 41521001) and the Natural Science Foundation of Hubei Province (Grant No. 2018CFB385).

Corresponding Authors: Hong-bin Zhan
Email: zhan@geos.tamu.edu
About author:


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