EXTRACTION TECHNOLOGY OF MICROSTRUCTURE OF SANDY SOIL IN COMPRESSION PROCESSES

The extraction of microstructure of sandy soil in the compression process can benefit to understand the micro-mechanism of the compression deformation and failure. In order to fix, extract and quantify the microstructure of sandy soil during compression, this paper designs an extraction technology of microstructure of sand soil in the compression process. It is mainly composed of two parts, an apparatus for blue epoxy injection and an improved sand collecting box. In consolidation tests of sandy soil, a step motor is used to drive blue epoxy into the compacted sandy soil sample, via the preset hose and the bottom side of permeable stone. Thin sections can be made when the epoxy is consolidated. The microstructure images can be captured by optical microscope. Using the technology, the microstructure of sandy soil is consolidated and captured during compressive process. This paper introduces the extraction technology. Three kinds of quartz sands with different particle sizes and sorting are compressed and consolidated in laboratory. When the microscopic images are obtained, the PCAS software is used to quantify the microstructures.