Abstract
In order to achieve a quantitative evaluation of the relationship between microstructure and dynamic characteristics of saturated loess, scanning electron microscope tests were carried out on the undisturbed samples and the samples experienced dynamic triaxial tests which were performed under dynamic loads of different amplitudes, frequencies, waveforms and confining pressures. The dynamic elastic modulus and microstructural parameters of loess under different types of dynamic loads were quantified at different stages of dynamic triaxial testing. The relationship between dynamic elastic modulus and microstructural parameters such as the diameter, average abundance, average fractal dimension and directional probability entropy of the structural units and pores was established through grey relation analysis and multivariate linear regression analysis; then, the global sensitivity analysis method (Morris method) was used to analyse the global sensitivity of each parameter. The result shows that when the waveform, confining pressure and amplitude are different, the dynamic elastic modulus of samples is mainly controlled by the microstructural characteristics of the pores. However, it is mainly controlled by the microstructural characteristics of structural units when the frequency changes. Furthermore, the sensitivity of microstructural parameters of pores is generally higher than that of structural units under different loading conditions.
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This work was supported by the National Natural Science Foundation of China (Grant no. 41472242).
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Chen, H., Shan, W. & Jiang, Y. Dynamic characteristics of Xianyang loess based on microscopic analysis: a quantitative evaluation. Bull Eng Geol Environ 80, 8247–8263 (2021). https://doi.org/10.1007/s10064-021-02432-x
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DOI: https://doi.org/10.1007/s10064-021-02432-x