[1]LIU Fuqiang,ZHONG Xiumei,LIU Zhaozhao,et al.Experimental Study on Dynamic Elastic Modulus and Damping Ratio of Undisturbed Loess Based on Microstructure[J].Journal of Seismological Research,2021,44(01):105-112.
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Experimental Study on Dynamic Elastic Modulus and Damping Ratio of Undisturbed Loess Based on Microstructure

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 44 Number of periods: 2021 01 Page number: 105-112 Column: Public date: 2021-01-15
Title:
Experimental Study on Dynamic Elastic Modulus and Damping Ratio of Undisturbed Loess Based on Microstructure
Author(s):
LIU Fuqiang1; 2; 3; ZHONG Xiumei2; 3; LIU Zhaozhao1; 2; 3; LIANG Shouyun1; GAO Ye1; WANG Shenning1
(1.College of Civil Engineering and Mechanics,Lanzhou University,Gansu 730000,Lanzhou,China)(2.Lanzhou Institute of Seismology,China Earthquake Administration,Gansu 730000,Lanzhou,China)(3.Key Laboratory of Loess Earthquake Engineering,China Earthquake Administration,Gansu 730000,Lanzhou,China)
Keywords:
scanning electron microscope;  dynamic triaxial test;  dynamic characteristics;  structural characteristics
CLC:
P315.931
DOI:
-
Abstract:
The structural characteristics of loess are important influence factors of dynamic elastic modulus and damping ratio.In this paper,the typical undisturbed loess samples in different regions are selected for dynamic triaxial tests and SEM tests.We statistically analyzed SEM images to obtain microstructure parameters by using PCAS pore image recognition and analysis system,and studyed the relationship between pore mesostructure parameters and initial dynamic elastic modulus and damping ratio of loess.The results show that the initial dynamic elastic modulus decreases with the increase of the average pore diameter,fractal dimension,probability entropy,and apparent porosity of loess.Among these four parameters,the average pore diameter and fractal dimension have a significant effect on the initial dynamic elastic modulus of the loess,which shows that the size and arrangement of pores are the main influence parameters.However,the damping ratio increases nonlinearly with the increase of apparent porosity,fractal dimension,the average pore diameter,and probability entropy of the loess,which has an obvious correlation with apparent porosity and fractal dimension.It shows that the number of pores and the arrangement of pores have an obvious influence on the damping ratio of the loess.
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