压实黄土(Q2)溶滤变形特性研究

doi:10.13722/j.cnki.jrme.2018.0881

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Abstract In order to explore the leaching deformation characteristics of compacted loess(Q2)，macroscopic leaching tests with 12 kinds of stress combinations and SEM tests with different immersion times were carried out. The results indicate that the changes of leaching strain and strength parameters have timeliness characteristics. The leaching axis，bulk strain and strain rate vary with the immersion time in a natural exponential function. The cohesive force decreases with increasing the duration of immersion but the internal friction angle changes little. For test control variable，the confining pressure has a hindering effect on the leaching deformation，and the slaking stress promotes the process of the leaching strain and determines the magnitude of the leaching strain. The quantitative analysis of microscopic parameters shows that，with increasing the immersion time，the pore size，the probability entropy and the fractal dimension of micro pores decrease while the probability entropy and fractal dimension of the cluster increase，and that the microscopic void ratio，the cluster size and curvature coefficient of the cluster decrease as the immersion time increases but the connection coefficient increase. The decreases of the pore size and the particle size indicate that the leaching deformation is a compaction process under the combined action of the immersion and the pressure. The change rate of the cluster size decrease with decreasing the slaking stress，which indicates that the degree of microstructure failure and recombination is proportional to the slaking stress. Three main microscopic parameters affecting the leaching volumetric strain such as the pore size，the fractal dimension of pores and the microscopic curvature coefficient，and two parameters influencing the cohesion including the pore probability entropy and the cluster fractal dimension were determined by KPCA method.

Key words： soil mechanics compacted loess(Q2) leaching deformation microscopic parameters time effect non-linear correlation

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	Articles by authors
	GAO Yuan1
	ZHENG Jianguo1
	2
	YU Yongtang1
	2
	LIANG Yi2

Cite this article:

GAO Yuan1,ZHENG Jianguo1,2, et al. Study on leaching deformation characteristics of compacted loess(Q2)[J]. , 2019, 38(1): 180-191.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0881 OR http://www.rockmech.org/EN/Y2019/V38/I1/180

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