Study On Static And Dynamic Properties Of Taiyuan Dongshan Loess

This paper is main to study the static and dynamic properties of Taiyuan Dongshan loess by the laboratory tests under different water contents. After analyzing the results of static and dynamic triaxial tests, we discover that the static constitutive relation becomes hardening shape from softening shape and the dynamic constitutive relation becomes hyperbolic model from linear model and the curve shapes for both conditions become smooth with the increasing of water contents. The static and dynamic strengths decrease with the water content increasing, and their relationship trends accord exponential function. The static and dynamic friction angles vary little with the change of water content, and they are very adjacent. Thefriction angle of loess is a constant parameter. The static and dynamic cohesions decrease with the increasing of water content, and they accord exponential function also. At lower water content, the dynamic cohesion is smaller than the static ones, in turn, the dynamic strength of Taiyuan Dongshan loess is lower than the static strength. But with the increasing of water content, dynamic strength will be close to static strength even exceed. The collapse settlement of Dongshan loess decreases and the seismic subsidence according to the same dynamic stress increases with the increasing of water content when the consolidation pressure is same. The relationship between coefficients of collapsibility and seismic subsidence can be set up through water content.The results of this study demonstrate that water content is a main affecting factor on static and dynamic properties of loess. Therefore, the influence of water on loess can be exposed by studying its properties under different water contents.