Effect of Complex Initial Stress Conditions on Dynamic Deformation Behaviors of Compacted Loess

Abstract:

In practical projects, foundations or roadbeds soil is usually in complex initial stress states, and deformation and settlement may happen caused by earthquakes or other dynamic loadings. Since conventional laboratory soil test cannot authentically reproduce dynamic behaviors of soils under complex initial consolidation stress conditions, dynamic deformation behaviors of compacted loess is conducted under complex initial stress conditions through remodeled DTC-199 torsional cyclic load triaxial apparatus. The paper systematically investigated the effects of different initial stress state, such as average principal stress p₀ , the angle of initial principal stress α₀ and the initial intermediate principal stress coefficient b₀, etc. on dynamic shear modulus G_d and damping ratio λ. Results show that: (1) To the same γ_d , G_d increases with the increase of p₀ but the α₀ and b₀ have no influence on G_d. (2) The α₀ has a little influence on λ and the p₀ and b0 have no influence on λ.

• Periodical: Applied Mechanics and Materials (Volumes 90-93)
• Pages: 67-73
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.90-93.67
• Online since: September 2011
• Authors: Da Wei Cheng, Ya Sheng Luo, Li Guo Yang, Xi Chen
• Keywords: Angle of Initial Principal Stress, Average Principal Stress, Compacted Loess, Damping Ratio, Dynamic Shear Modulus, Initial Intermediate Principal Stress Coefficient

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