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为模拟围压对岩石峰后强度、模量退化和剪胀的影响,将岩石的变形过程简化为线弹性变形、脆性跌落和理想塑性3个阶段,利用退化指数和扩容指数描述围压对岩石峰后强度、模量退化和剪胀的影响,建立了考虑围压影响的岩石弹脆塑力学模型。通过Hoek-Brown和Mohr-Column准则之间参数的转换关系,给出了模型峰后力学参数的确定方法。在FLAC软件下,利用Fish函数方法实现了建立的弹脆塑性力学模型。在数值算例中,利用本文模型分析了不同围压下岩石的峰后力学特性劣化和剪胀扩容特征,结果表明本文模型不仅能较好地模拟岩石峰前、峰后全程变形发展过程,而且能较好地考虑围压对岩石峰后力学特性的影响。
In order to simulate the effect of confining pressure on the post-peak strength, modulus degradation and dilatancy of rock, the deformation process of rock is simplified to three stages: linear elastic deformation, brittle drop and ideal plasticity. The degradation index and expansive exponent are used to describe the influence of confining pressure on rock The post-peak strength, modulus degradation and dilatancy, a mechanical model of rock fragile plastic with influence of confining pressure was established. Based on the relationship between the Hoek-Brown and Mohr-Column criteria, the method for determining the mechanical parameters of the model after the peak is given. Under FLAC software, the elastic and brittle plastic mechanical model is established by using Fish function method. In the numerical example, the characteristics of the rock under different confining pressure were analyzed by using this model. The results show that this model can not only simulate the deformation process of rock before and after peak, but also Can better consider the impact of confining pressure on the mechanical properties of rock after peak.