SEISMOLOGY AND GEOLOGY ›› 1992, Vol. 14 ›› Issue (4): 376-380.

• Brief Report • Previous Articles    

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

Feng Jinjiang, Li Jianguo   

  1. Instiitute of Geology, State Seismalogical Bureau, Beijing 100029
  • Received:1990-02-28 Online:1992-12-09 Published:2009-11-25

高温高压下蒙脱石显微变形与力学性质的研究

冯锦江, 李建国   

  1. 国家地震局地质研究所 北京 100029
  • 基金资助:
    地震科学联合基金(85009)

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

摘要: 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℃,σ3≥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。

关键词: 蒙脱石, 高温高压, 显微变形, 应力-应变, 稳定滑动