【摘要】 岩石空隙率与空隙的几何性质是影响其渗透率的关键因素。通过分析渗透率-应变曲线与岩石破坏过程的对应关系,指出岩石的渗透率与岩石的体应变密切相关。在压密区间内,岩石的渗透率呈现为负指数下降;峰前膨胀区间内,渗透率快速增加,并在末期形成贯通性的渗透通道;在峰后阶段由于部分通道被堵塞,渗透率发生下降。同时,将断裂力学推广到考虑岩石介质的微观破坏不均匀性,指出岩石渗透率的变化主要是由尺度等级较小的微破裂的相互作用和生长引起的主干断裂,进而形成贯通性的渗透通道。更多还原

【Abstract】 Considering the relation between permeability-strain curve and rock failure process,the relationship among permeability,strain and stress of rock is analyzed based on the permeability-strain curve and permeabil-ity-stress curve under complete stress-strain path.It is proposed that rock system gets its instability condition,when stress reaches the critical value.The experimental results verify the reasonableness of the analysis.The results show that the lowest rock permeability corresponds to the rock expansion point.The stress-strain path can be di-vided to three stages,which are compaction stage,expansion stage of pre-peak and post-peak stage.It is proposed that the change of rock permeability is caused by the interaction of the smaller micro-scale level burst,which re-sulted in the formation of permeable channel.更多还原