Being different from clay, fly ash is a kind of granular material. The stress ratio-strain relation of fly ash is related to both mean stress and void ratio. A number of consolidated-drained triaxial tests were carried out on a fly ash with different initial void ratios under different confining pressures. Relevant stress-strain relations have been obtained. Simple modifications have been made to the elastoplastic model proposed by Yao, et al., which considers the mean stress and initial void ratio. The mechanical behavior of fly ash specimens with different initial void ratios from drained triaxial tests are consistently predicted by the modified model. The application of the state parameter and hardening/softening parameters in the critical state model can predict dilatancy, hardening and
softening characteristics of the fly ash.
XU Zhi-liang, SUN De-an, ZHANG Jin-yi
. Mechanical Behavior of Fly Ash and Its Elastoplastic Modeling[J]. Journal of Shanghai University, 2013
, 19(1)
: 106
-110
.
DOI: 10.3969/j.issn.1007-2861.2013.01.021
[1] 刘兴德, 牛福生, 倪文. 粉煤灰的资源化利用现状与研究进展[J]. 建材技术与应用, 2005(1): 12-15.
[2] 冯海宁, 杨有海, 龚晓南. 粉煤灰工程特性的试验研究[J].岩土力学, 2002, 23(5): 579-582.
[3] Roscoe K H, Burland J B. On the generalised stressstrain behavior of “wet” clay [M]. Cambridge: Cambridge Press, 1968: 535-609.
[4] 姚仰平, 余亚妮. 基于统一硬化参数的砂土临界状态本构模型[J]. 岩土工程学报, 2011, 33(12): 1827-1832.
[5] Pestana J M, Whittle A J. Formulation of a unified constitutive model for clays and sands [J]. International Journal for Numerical Methods in Geomechanics, 1999,
23(12): 1215-1243.
[6] Verdugo R, Ishihara K. The steady state of sandy soils [J]. Soils and Foundations, 1996, 36(2): 81-91.
[7] Li X S, Wang Y. Linear representation of steady-state line for sand [J]. Journal of Geotechnical Engineering, 1998, 124(12): 1215-1217.
[8] Been K, Jefferies M G. A state parameter for sands [J]. Geotechnique, 1985, 35(1): 99-112.
[9] Yao Y P, Sun D A, Luo T. A critical state model for sands dependent on stress and density [J]. International Journal for Numerical and Analytical Methods in Geomechanics,
2004, 28(4): 323-337.
[10] Li X S, Dafalias Y F. Dilatancy for cohesionless soils [J]. Geotechnique, 2000, 50(4): 449-460.
