Correlation between microscopic parameters and dynamic elastic modulus of loess
AN Liang1, DENG Jin1, 2, 3, GUO Peng4, ZHANG Yang-peng5, ZHENG Fang1
1. Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China; 2. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China; 3. Lanzhou Base of Institute of Earthquake Prediction, China Earthquake Administration, Lanzhou 730000, China; 4. Geotechnical Engineering Institute, Tianjin University, Tianjin 300072, China; 5. College of Transportation, Jilin Uniersity, Changchun 130022, China
Abstract：The silty soil and silty clay samples of 2~12 m-deep soil layer of the Minxian Seismic Station and the Qingyang Loess Plateau are studied by the dynamic triaxial and scanning electron microscopy experiments, and the dynamic elastic modulus and microstructure characteristics are measured. The dynamic constitutive relation of silty clay is studied. The relationship between the vertical structure of the loess and the transverse (perpendicular to sedimentary direction) and the maximum dynamic elastic modulus are studied by the correlation analysis method. The results show that the dynamic constitutive relations of silt and silty clay are consistent with the Hardin-Dinevich hyperbolic model. The influences of fractal dimension, probability entropy and average shape coefficient on the maximum dynamic elastic modulus of silt and silty clay are the most sensitive. Secondly, for the average circumference, long axis and short axis, the average area has a relatively small impact on them. In view of the vertical and horizontal correlations of silt, the influences of transverse microscopic parameters on the maximum dynamic elastic modulus are more sensitive. For the silty clay, the influences of vertical microscopic parameters on the maximum dynamic elastic modulus are more sensitive.
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