ABSTRACT
Due to the regionality of geological environmental conditions, climate diversity and near periodicity of climate change in the Loess Plateau, the microstructure of loess in a typical stratum often has regional characteristics in statistics, and the microstructure differences between different loess strata are also very significant. Therefore, this paper carried out micro experiments on loess from different strata in LuoChuan, and established a set of quantitative parameter indexes of loess particle microstructure based on mature and scientific research methods of loess microstructure. Through the quantitative characterization of particle parameter indexes, the results show that probability density of equivalent diameter meets Rational distribution and that probability density of sphericity meets Beta distribution well in each stratum. With the increase of stratum depth, LuoChuan Loess shows the variation characteristics of particle size gradually increasing, sphericity gradually decreasing. The Loess particles in deeper strata are not easy to be deposited vertically, but tend to be deposited gently or horizontally, and most of the particles in each stratum are distributed in the northeast. At the same time, the genesis of LuoChuan loess is discussed, and it is basically concluded that the material source of LuoChuan loess is the same, and the carrying force is the main factor causing great differences.
