Effects of stress conditions on rheological properties of granular soil in large triaxial rheology laboratory tests
In order to study the rheologicai properties of red stone granular soil, a series of rheological experiments were executed on large tri-axial rheological apparatus. Under 100, 200 and 300 kPa confining stress conditions, the rheologieal tests were carried out.These experiment results showed that the stress conditions, especially the stress level were the critical influencing factors of the rheological deformation properties. Under the low stress level (S=0.1), the granular soil showed the elastic properties, and there was no obvious rheological deformation. Under the middle stress level (0.2＜S≤0.6), creep curves showed the linear viscoelastic rheoiogical properties. However, under the high stress level (S＞0.8) creep curves showed the non-linear viscous plastic rheological properties. Especially, under the stress level of S=1.0, the accelerated rheological phase of creep curves occurred at early time with a trend of failure. The stress level had obvious effects on the final rheological deformation of the soil sample, and the final rheological deformation increments nonlinearly increased with stress level. The final rheologieal deformation increment and step was little under low stress level, while it became large under high stress level, which showed the nonlinenrly rheological properties of the granular soil. The confining pressure also had direct effects on final rheological deformation, and the final rheological deformation linearly increased with confining pressure increments.
stress conditions granular soil creep large triaxial rheology test redstone granular soil final creep deformation
CHEN Xiao-bin(陈晓斌) ZHANG Jia-sheng(张家生) LIU Bao-chen(刘宝琛) TANG Meng-xiong(唐孟雄)
School of Architectural and Civil Engineering, Central South University, Changsha 410075, China Guan School of Architectural and Civil Engineering, Central South University, Changsha 410075, China Guangzhou Institute of Building Science, Guangzhou 510440, China
国际会议
长沙
英文
397-401
2008-09-28（万方平台首次上网日期，不代表论文的发表时间）