Effects of Complex Initial Stress State Parameters on Dynamic Shear Modulus of Loess

Abstract:

The foundation soil of the buildings and structures is often in complex initial stress states. The dynamic torsional shear triaxial tests are carried out on undisturbed and remodeling loess under different complex initial stress states by using the remolded DTC-199 torsional cyclic load triaxial apparatus, and the effects of each complex initial stress state parameter on dynamic shear modulus of loess are discussed. Results show that, other conditions being the same, the influence of angles of initial principal stress α₀ on dynamic shear modulus G_d of loess show a trend of the bigger α₀ is, the smaller G_d is. The effect laws of efficient of initial intermediate principal stress b₀ on G_d of loess are not obvious. When the dynamic shear strain is larger, the bigger initial deviator stress ratio η₀ is, the smaller G_d of loess is. The influence of initial average principal stress p_m0 on loess is significant. The bigger p_m0 is, the bigger G_d of loess is. G_d of undisturbed loess is greater than that of remodeling loess under the complex initial stress states.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 2601-2606
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.2601
• Online since: May 2011
• Authors: Zhi Jie Wang, Ya Sheng Luo, Hong Guo
• Keywords: Complex Initial Stress State, Damping Ratio, Dynamic Shear Modulus, Loess

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