Different Clayey Soil Compaction Degree Concept Of Micro Pore Structure Research And Fractal Characterization

The change in the physical and mechanical properties of soil is with its microscopicpore structure to represent. So by expanding the study of micro view of soil structure isextremely profound significance. Soil types are not in the form of a distinct anddiversified, the structure of the clayey soil is more complex, the change of pore structurewill directly lead to mechanical properties change, it’s brought the inconvenience on thequantitative research. Now, the study of soil is far from the point of engineeringapplication entity. Can say clay micro view of research is to explore change itsmechanical properties, dynamic and impact value of a process, so from the micro viewAngle to study its intrinsic regularity has important scientific significance, can use moredeepen the theoretical basis of the adaptability of the clay properties of architecturalengineering has more obvious improvement.This article research work, and gets the conclusion as follows:(1) in this paper, experimental study on the use of clay taken from han street ofwuhan at the bottom of the foundation pit, the area of clay with high porosity, largecompressibility, the characteristics of high moisture content. First use of high resolutiondigital camera for airing reshape and soil desiccation shrinkage of the soil sample underthe status of the macro picture, and by using scanning electron microscope (SEM)obtained soil microscopic photos of magnified500times, for micro view of viscous soilpore structure for quantitative analysis.(2) with the help of Image processing software IPP (Image-Pro Plus) for all thefine view pictures for black and white and normalize the prophase processing, and usingImage processing software PS (PhotoShop) layer, path, delete, unclick function of blackand white culture Image processing, strive for processing images can reflect the soilstructure.(3) the use of IPP software to analyze all the photos after processing, the portnumber is obtained by calculation, the aperture size, the area size. According to theseindexes using the aperture size divided into a number of different pore size ranges.(4) before the contraction macroscopic soil analysis, found that the smaller the drydensity of the sample voids, porosity is larger. Instead of dry density is larger sampleporosity is less, more compacted soil.The pore are mainly distributed in the0.133～0.138mm. After drying shrinkage pore are mainly distributed in the soil of0.134～0.137mm, and the contraction after the sample is almost large pore in the soil.Smallporosity change is not obvious.(5) In the calculation of shrinkage rate of soil after drying shrinkage, dry density,the smaller the sample of contract, the more the greater the dry density of the smallersample contraction. (6) Macroscopic undisturbed soil sample particles area has the very good fractalcharacteristics, and the fractal dimension increases with the increase of dry density. Butthe pore number variation is not apparent fractal characteristics.(7) When doing electron microscope scanning, takes the soil area can’t reflect theinternal nature of the study characteristics of spatial variability is larger.