Song Jian, Ma Jiaxin, Li Fengyan, Chai Lina, Chen Wenfu, Dong Shi, Li Xiaojun
Shaanxi Provincial Communication Investment Group Co., LTD, Xi'an 710065, China.
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
Materials (Basel). 2021 Nov 1;14(21):6549. doi: 10.3390/ma14216549.
In order to explore the fractal characteristics of particle size distribution (PSD) of various minerals in loess and lime-treated loess, the Q4 undisturbed loess and lime-treated loess were studied. From the perspective of multi-scaled microstructure, the internal characteristics of loess were observed and the regularity statistics were carried out from a macroscopic view. Fractal theory was used to quantitatively study the distribution of mineral particles in undisturbed loess and lime-treated loess. It was found that the skeleton particles of undisturbed loess were obvious and the structure of soil was loose. While that of lime-treated loess decreased, the fine particles were connected with each other, and the structure of soil changed from loose to dense. The three mineral particles in the undisturbed loess and lime-treated loess did not accord with the single fractal distribution characteristics, but the total particles had fractal characteristics. The percentage content of the mineral particles in the soil varied greatly with the particle size. In addition, the non-uniform degrees of mineral particles in the two soils from large to small were carbonate minerals of lime-treated loess, carbonate minerals of undisturbed loess, quartz minerals of lime-treated loess, feldspar mineral of lime-treated loess, feldspar mineral of the undisturbed loess, and the quartz mineral of the undisturbed loess. This paper provided a basis for the future study of the different soil mechanical properties of undisturbed loess and lime-treated loess.
为了探究黄土及石灰改良黄土中各类矿物粒径分布（PSD）的分形特征，对Q4原状黄土和石灰改良黄土进行了研究。从多尺度微观结构角度，观察了黄土的内部特征，并从宏观角度进行了规律性统计。运用分形理论对原状黄土和石灰改良黄土中矿物颗粒的分布进行了定量研究。结果表明，原状黄土骨架颗粒明显，土体结构松散；而石灰改良黄土的骨架颗粒减少，细颗粒相互连接，土体结构由松散变为密实。原状黄土和石灰改良黄土中的三种矿物颗粒均不符合单一分形分布特征，但总体颗粒具有分形特征。土体中矿物颗粒的百分含量随粒径变化差异较大。此外，两种土中矿物颗粒不均匀程度由大到小依次为：石灰改良黄土中的碳酸盐矿物、原状黄土中的碳酸盐矿物、石灰改良黄土中的石英矿物、石灰改良黄土中的长石矿物、原状黄土中的长石矿物、原状黄土中的石英矿物。本文为今后研究原状黄土和石灰改良黄土不同的土力学性质提供了依据。
