Acta Scientiarum Naturalium Universitatis Sunyatseni ›› 2020, Vol. 59 ›› Issue (6): 64-69.doi: 10.13471/j.cnki.acta.snus.2020.05.13.2020D019

• Research articles • Previous Articles     Next Articles

Burgers model of creep properties of colluvial soil-rock mixture

Hong GUO1,2,3(), Rui GUO1, Yalin NAN2,3(), Peng ZHANG2, Kui LIU2,4   

  1. 1.School of Civil Engineering and Architecture,Shaanxi University of Technology,Hanzhong 723000,China
    2.China Electronic Research Institute of Engineering Investigations and Design,Xi’an 710054
    3.Soil Engineering Technology Research Center of Shaanxi,Xi’an 710054,China
    4.College of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China
  • Received:2020-05-13 Online:2020-11-25 Published:2020-11-27
  • Contact: Yalin NAN E-mail:hguo@snut.edu.cn;nan.yalin@dky53.com

Abstract:

In order to investigate the creep characteristics of colluvial soil-rock mixture, shear creep tests were performed by using a large-scale direct-shear instrument on a colluvial soil-rock-soil mixture of a slope in Chenggu county, Shaanxi province. The creep characteristics of the colluvial soil-soil-mixture under graded loading were mainly studied to establish the Burgers creep model and determine the parameters through the data fitting. The method of obtaining the final creep value of separate loading under the condition of graded loading is suggested. The results showed that the creep law of soil-rock mixture exhibits a gradual creep behavior under the grading loading, and the creep deformation increases with decreasing vertical and increasing shear stresses. The curves of t/ε(t)-ε(t0)-t under different vertical stresses are all highly linear, and there is no obvious correlation between the slope of the fitted straight line and the shear stress. The Burgers model proposed in this paper can well simulate the shear creep characteristics of the colluvial soil-rock mixture in the research area.

Key words: colluvial soil-rock mixture, shear creep, Burgers model

CLC Number: