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为讨论饱水岩石中孔隙水压与损伤变形过程的关联性,探究岩石破坏的孔隙水压前兆特征信息,采用三轴压缩试验、渗流实验相结合的方法,分析了在不同孔隙水压和不同围压条件下饱水岩石变形破坏过程中损伤扩展与孔隙水压变化的内在联系.研究表明:(1)开放饱和岩石单元体中,岩石在受荷破坏全过程中的初始压密、弹性压缩、塑性变形和破坏失稳阶段,孔隙水压呈现增高、稳定、逐渐减小和锐减变化;(2)岩石破坏的孔隙水压前兆特征明显,在主破裂前夕,内部损伤加剧,裂隙贯通,孔隙水压将失去稳定状态,孔隙水压由稳态锐减可作为岩石破裂的前兆信息;(3)在应力变化大、高孔隙水压以及高围压条件下,孔隙水压对损伤发展更为敏感,响应也更明显,孔隙水压与损伤发展相互影响,互为关联,损伤扩展造成孔隙水压降低,孔隙水压降低又促进损伤发展;(4)可以尝试在深部开采工程中监测岩体内部孔隙水压的变化来预测岩体失稳的突发性灾害.
In order to discuss the correlation between pore water pressure and damage and deformation process in saturated water rock and to explore the characteristics of prehistoric pore pressure information of rock failure, this paper analyzes the relationship between pore water pressure and different pore water pressure by using the combination of triaxial compression test and seepage experiment. The results show that: (1) In open saturated rock units, the initial compaction and elastic compression of the rock during the entire process of loading failure are shown in the paper. , Plastic deformation and failure instability stage, the pore water pressure showed an increase, stable, and gradually decrease and sharp changes; (2) rock pore water pressure precursor characteristics of the obvious, on the eve of the main rupture, increased internal damage, crack through, The pore water pressure will lose its steady state, and the pore water pressure decreases sharply from steady state to be a precursor of rock failure. (3) Under the conditions of large stress changes, high pore pressure and high confining pressure, As sensitive and more obvious response, pore water pressure and injury development influence each other, interrelated, damage caused by pore water pressure decreases, reduced pore water pressure and promote injury development; (4) can try to deep Mining engineering changes in the internal pore pressure monitoring to predict rock mass destabilization by sudden disasters.