QUANTITATIVE ANALYSIS AND DISCUSSION ON THE MICROSTRUCTURE INDEX OF SILT

The silt has high organic content, strong compressibility and low mechanical strength, which can easily lead to engineering geological disasters such as uneven settlement or subsidence of the building(structure). Among the silt, the empty frame structure is a prominent feature of the microstructure of the Southern China silt. The uneven distribution of matter and pores leads to the difficulty of extracting the representative microstructure profile, which restricts the in-depth study of the microscopic macroscopic properties of the soil. We analyzed the microstructure of Daya Bay silt by synchrotron radiation micro-CT technology, and construct the continuous structure of the non-destructive sample, which avoids the blindness of single structure section extraction. In order to avoid the influence of time and space and the three-dimensional spatial dispersion of the structural data of the sample, we studied quantitative data such as spectral data analysis and sample number dispersion degree in depth. Then we quantified and discussed the basic structure data such as void ratio and shape coefficient. In the main consolidation process, the dispersion ratio of the sample data such as the void ratio and shape coefficient in the three-dimensional space increases first and then decreases. In the secondary consolidation stage, the dispersion degree of the sample data again shows an increasing trend. The quantitative analysis of the degree of dispersion not only quantifies the degree of non-uniformity of the microstructure during the consolidation process, but also reflects the variation of the sludge in the consolidation. Studies have shown that under increasing consolidation pressure, the sludge exhibits homogeneous-heterogeneous and then homogenized structural evolution characteristics.