|Table of Contents|

Nonlinear rheological model for Q2 loess in Xian region(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2009年05期
Page:
41-46
Research Field:
Publishing date:
2009-10-20

Info

Title:
Nonlinear rheological model for Q2 loess in Xian region
Author(s):
XIE Xing1;  ZHAO Fasuo2;  WANG Donghong3
1. School of Earth Science and Resources, Changan University, Xian 710054, Shaanxi, China; 2. Institute of Geological Engineering, Changan University, Xian 710054, Shaanxi, China; 3. Institute of Geotechnical Investigation and Design, Xian 710043, Shaanxi, China
Keywords:
geotechnical engineering;  Q2 loess;  nonlinear;  rheological property;  rheological model
PACS:
TU 411;U416.14
DOI:
-
Abstract:
In order to study the rheological characters of Q2 loess, the indoor uniaxial and triaxial creep tests under different pressure of Q2 loess with different water contents in Xian are carried out, the uniaxial and triaxial creep curves and tresstrain isochronous curves are presented. The results show that: there is instantaneous deformation at the load instant of Q2 loess, the creep deformation is decay stabilization when stress is lower than a critical value, it is acceleration stage when stress is higher; isochronous curves are almost straight line when stress is lower, they are curves when stress is higher, so the Q2 loess have nonlinearity creep properties. On the basis of these, viscoelastic creep phase is simulated by the generalized Kelvin model, linear viscoplastic creep phase is simulated by the Maxwell model, nonlinear viscoplastic creep phase is simulated by the empirical model of power function, the nonlinear uniaxial and triaxial rheological constitutive models of Q2 loess with different water contents are set up, and its parameters are determined by quasiNewton method. Then the experimental creep curves are simulated. The results indicate that the model can effectively describe the rheological process of Q2 loess. 5 tabs, 5 figs, 13 refs.

References:

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Last Update: 2009-10-20