马兰黄土粒度与孔隙的空间变化规律分析

本文对黄土高原不同区域马兰黄土的孔隙和颗粒微细观结构特征进行了对比分析。分别选取陕西泾阳、甘肃正宁和甘肃黑方台地区的原状样，进行颗粒分析试验，并用光学显微镜和图像合成技术，获取了其微细结构图像，对孔隙面积、等效直径进行统计，得到黄土孔隙的定量参数。对比表明：平均粒径自西向东递减，甘肃黑方台马兰黄土最大，甘肃正宁居中，泾阳最小，而黄土孔隙平均直径甘肃正宁最小，泾阳与黑方台相近。黄土成分和结构与沉积环境有关，其孔隙分布特征与粒度组成间存在一定关系。

SPATIAL VARIATION LAW OF PARTICLE SIZE DISTRIBUTION AND PORE DISTRIBUTION OF MALAN LOESS

In this paper, porosity and particle micro and fine structural features of Malan loess in the different regions of the Loess Plateau were analyzed. We selected undisturbed samples from Shaanxi Jingyang, Gansu Zhengning, and Gansu Heifangtai region, which we did particle analysis test. With an optical microscope and image synthesis technology, we accessed to its micro and fine structure of the image. By using the image, the pore area and the equivalent diameter are counted, as well as the quantitative parameters of the pore of the loess are obtained. The results showed that: The average particle diameter of Malan loess showed a decreasing trend from west to east, which in Gansu Heifangtai is largest, in Gansu Zhengning is center, in Jingyang is minimum. The average pore diameter of Gansu loess is rather minimal, and Heifangtai and Jingyang station are similar. The composition and structure of loess are related to the sedimentary environment, as well as, there is a relationship between the pore size distribution and composition.