Test on dynamic characteristics of subgrade of heavy-haul railway in cold regions |
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| Authors: | YingYing Zhao XianZhang Ling ZiYu Wang XinYan Shao LiHui Tian and Lin Geng |
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| Institution: | School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, ChinaSchool of Architectural Engineering, Jiamusi University, Jiamusi, Heilongjiang 154000, China;School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China |
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| Abstract: | Dynamic characteristics of heavy-haul railway subgrade under vibratory loading in cold regions are investigated via low-temperature dynamic triaxial tests with multi-stage cyclic loading process. The relationship between dynamic shear stress and dynamic shear strain of frozen soil of subgrade under train loading and the influence of freezing temperatures on dynamic constitutive relation, dynamic shear modulus and damping ratio are observed in this study. Test results show that the dynamic constitutive relations of the frozen soils with different freezing temperatures comply with the hyperbolic model, in which model parameters a and b decrease with increasing freezing temperature. The dynamic shear modulus of the frozen soils decreases with increasing dynamic shear strains initially, followed by a relatively smooth attenuation tendency, whereas increases with decreasing freezing temperatures. The damping ratios decrease with decreasing freezing temperatures. Two linear functions are defined to express the linear relationships between dynamic shear modulus (damping ratio) and freezing temperature, respectively, in which corresponding linear coefficients are obtained through multiple regression analysis of test data. |
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| Keywords: | low-temperature dynamic triaxial test dynamic constitutive relation dynamic shear modulus damping ratio freezing temperature |
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