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本文通过研究地壳温压条件下迁安石英岩非弹性变形特征和机制,着重阐述了这类岩石产生非弹性变形的能力和温度压力之间的关系,以及对岩石宏观失稳型式的影响。研究表明,温度和压力的升高将导致岩石中石英晶粒逐步转化为塑性组分,转化过程中伴随着岩石宏观非弹性变形的增强。宏观非弹性变形增强幅度和微观转化为塑性组分的石英晶粒含量满足一定的统计关系。当转化的塑性组分达到一定量级时,岩石的宏观力性和失稳型式将产生明显变化,变化的趋势是易于产生非弹性变形而渐进失稳。
In this paper, by studying the characteristics and mechanism of inelastic deformation of Qian’an quartzite under the condition of temperature and pressure of crust, the relationship between the ability of this kind of rock to produce inelastic deformation and temperature and pressure, as well as the impact on the macro-instability type of rock are emphasized. The results show that the increase of temperature and pressure will lead to the gradual transformation of quartz grains in the rock into plastic components, accompanied by the enhancement of the macro-inelastic deformation of the rock during the transformation. The extent of macro-inelastic deformation enhancement and the content of quartz grains microscopically transformed into plastic components satisfy a certain statistical relationship. When the plastic component of transformation reaches a certain magnitude, the macroscopic force and the instability type of the rock will have a significant change, the trend of change is prone to inelastic deformation and gradual instability.