高温高压下蒙脱石显微变形与力学性质的研究

通过研究高温高压条件下蒙脱石的变形特征和机制,着重阐述了蒙脱石的显微变形特征与温度压力之间的关系,以及对应力-应变的影响。研究表明,在围压为200M Pa条件下,温度升高将导致蒙脱石的变形增大。对相同应变量所需的差异应力则随温度上升而下降。但是,当温度>500℃时,相同应变量所需差异应力较300℃时显著增大,其屈服强度和变形模量在T≥500℃,σ≥300MPa时均因脱水明显增大。蒙脱石在高温高压下均为渐进失稳

MICRO-DEFORMETION AND MECHANICAL PROPERTIES OF MONTMORILLONITE AT HIGH TEMPERATURE AND PRESSURE

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