土のせん断破断面の微視的観察

Abstract

Soil microstructures play important roles on the soil behaviour. The observation technique with a SEM (Scanning Electron Microscope) is considered as an effective method to study microstructure of soils.The object of this research is to study a microscopic deformation behaviour of clays by using the USSBT (Ultra Small Shear Box Test), which was developed by the author.To observe clay specimens under the wet condition in SEM, it is necessary to replace pore water with the proper material that is bearable under a high vacuum condition. Polyethylene Glycol was introduced for it and a suitable replacing technique for the undisturbed sample was established.Many effective data were obtained through kaolinite samples. They make possible to verify the past assumption about shearing deformation patterns, some of which are shown the shear band and the special particle movement in it.