高偏应力作用下注浆孔围岩塑性区连通机制及加固技术研究

Study on Connection Mechanism and Reinforcement Technology of Plastic Zone in Surrounding Rock of Grouting Hole under High Deviatoric Stress

高偏应力场中多个注浆孔的围岩塑性区分布和破坏机制对于注浆加固技术研究具有重要意义。首先对不同偏应力条件下单个注浆孔围岩塑性区形态进行研究,认为随着主应力比值的不断增大,塑性区的形态呈现出由圆形变为椭圆形再变为“蝶形”的规律。高偏应力条件下多个注浆孔围岩塑性区均呈现为“后蝶形”,导致塑性区出现了连通。高偏应力条件下有助于浆液的扩散,有利于提高加固效果。

The distribution and failure mechanism of plastic zone in surrounding rock of multiple grouting holes in high deviatoric stress field are of great significance for the study of grouting reinforcement technology.Firstly,the shape of the plastic zone of the surrounding rock of a single grouting hole under different deviatoric stress conditions is studied.It is considered that with the increase of the principal stress ratio,the shape of the plastic zone changes from round to oval and then to 'butterfly'.Under the condition of high deviatoric stress,the plastic zone of surrounding rock of multiple grouting holes is presented as 'rear butterfly',which leads to the connection of plastic zone.Under the condition of high deviatoric stress,it is helpful to the diffusion of slurry and to improve the reinforcement effect.