工程地质学报2012，Vol.20Issue(6)：1064-1070,7.
延安Q2黄土统计损伤本构模型研究
STUDY ON CONSTITUTIVE MODEL OF STATISTICAL DAMAGE FOR YAN'AN Q2 LOESS
张乐中 1何青峰2
作者信息
- 1. 长安大学地质工程与测绘学院 西安710054
- 2. 西安科技大学地质与环境学院 西安710054
- 折叠
摘要
Abstract
The physical and mechanical properties of loess at different regions in China have significant differences. Based on the data from ordinary triaxial test of Yan'an Q2 loess under different confining pressures and mis-ture contents, this paper establishes the constitutive model of triaxial statistical damage for Yan'an Q2 loess by introducing rock statistical damage theory in the damage constitutive model of Yan'an Q2 loess. In the meantime, the paper considers the effect of damage threshold on Yan'an Q2 loess damage variable as well.. In addition, the parameters in damage constructive equation are calculated by linear regression on the test results. The experiment and a-nalysis present that in semilogarithmic coordinates, the initial damage point is the peak inflection point of triaxial stress-strain curve of Yan'an Q2 loess. The corresponding value of damage point is also the damage stress threshold. The Yan'an Q2 loess cannot damage and the stress and strain can be in linear elastic relationship when applied stress is less than damage threshold. Conversely, Yan'an Q2 loess can begin to damage. And the damage of Yan'an Q2 loess can enlarge with the increase of applied stress. Finally, statistical damage curve shows good agreements
with test curve. This paper indicates that with the consideration of damage threshold, loess statistical damage constitutive model can better reflect the characteristics of Yan'an Q2 loess deformation and failure, with a reference for geotechnical engineering design in the loess plateau.关键词
延安Q2黄土/统计损伤/本构模型Key words
Yan'an Q2 loess, Statistical damage, Constitutive model分类
天文与地球科学引用本文复制引用
张乐中,何青峰..延安Q2黄土统计损伤本构模型研究[J].工程地质学报,2012,20(6):1064-1070,7.
