【摘要】 对大孔隙率砂岩在不同饱和液体情况下的力学特性进行了试验研究,以两种破坏理论对大孔隙率砂岩的破坏特征进行了解释.试验证明:大孔隙率砂岩存在临界围压,随着围压的变化,大孔隙率岩石以压剪破坏为主逐渐转化为以孔隙坍塌破坏为主;在油水转化过程中,也存在临界饱和度,超过此临界饱和度,岩石力学性质发生较大改变.更多还原

【Abstract】 <Abstrcat> The experimental study is performed on the mechanical behaviors of rock with la rge porosity. Two kinds of failure theories are used to explain the failure types of sandstone with large porosity based on the experimental results under different saturated liquid conditions. The existence of threshold confining pressure is proved during the process from the mainly deviato ric stress failure to t he mainly slough failure. A critical saturated degree also exists during the cha nging processes from oil saturation to water saturation. When the water saturate d degree is above the critical value, the mechanical features of sandstone with la rge porosity are changed clearly.更多还原