COMPOSITION AND MICROSTRUCTURE PROPERTIES OF DISCRETE STRUCTURAL SURROUNDING ROCKMASS IN THE LOW GEOSTRESS REGION

This paper presents analytical results of composition and microstructure of the discrete structural surrounding rock mass in a low geostress region. Rock samples, taken from the surrounding rock mass at different locations of the underground excavation for a water conveyance project, are analyzed for chemical composition, average percentage of content, and microstructures by using electron diffraction and electron-scan microscope. The micro-deformation of the rock is then characterized, thus providing guidelines for further study for macro deformation, failure and stability of rock masses in the low geostress region.