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Dynamic Behavior of Unsaturated Decomposed Mudstone Soil Under Low Strain Amplitude  

Huh, Kyung-Han (초당대학교 건설정보학과)
Chung, Choong-Sun (경원전문대학 토목환경과)
Bae, Joong-Seon ((주) 도건이엔씨 지반공학부)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.4, no.2, 2004 , pp. 19-27 More about this Journal
Abstract
The interest in the dynamic properties of soils has increased strongly because of earthquake, heavy traffic, and foundations undergo high amplitude of vibrations. Most of soils in Korean peninsula are composed of granite soils, especially the decomposed mudstone soils are widely spread in Pohang areas, Kyong-buk province. Therefore, it is very important to investigate the dynamic properties of these types of soils. The most important soil parameters under dynamic loadings are shear modulus and material dampings. Furthermore, few definitive data exist that can evaluate the behavior of unsaturated decomposed mudstone soils under dynamic loading conditions. The investigations described in this paper is designed to identify the shear modulus and damping ratio due to a surface tension for the unsaturated decomposed mudstone soils under low and high strain amplitude. For this purpose, the resonant column test and the cyclic triaxial test were performed. Test results and data have shown that the optimum saturated degree of decomposed mudstone soils under low and strain amplitude is $32{\sim}37%$ which is higher than that of decomposed granite due to the amount of fine particles as well as the type and proportion of chief rock-forming minerals.
Keywords
decomposed mudstone soils; dynamic loadings; shear modulus; damping ratio; low and high strain amplitude; resonant column test; cyclic triaxial test; optimum degree of saturation Parameter;
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