关键词: 蒙脱石, 高温高压, 显微变形, 应力-应变, 稳定滑动

Abstract: This paper deals with the characteristics and mechanism of micro-deformetion of montmorillonite, especially the relationship between deformation and increasing temperature and pressure. The study shows that micro-deformation of montmorillonite increases with increasing temperature at the confining pressure of 200MPa. The differential stress decreases with increasing temperature (100-300℃) at the same strain but increases at temperature 500℃. The deformation modulus and yield strength increase at T≤500℃ and σ₃≤300MPa due to dewatering of montmorillonite with increasing temperature. The gradual failure of montmorillonite took place at high temperature and pressure. It is favorable to stable slide.

Key words: Montmorillonite, High temperature and pressure, Micro-deformation, Stress-strain, Stable sliding