贯穿裂隙岩体峰后变形特性研究

岩体峰后变形反映了其峰值强度后屈服、弱化的规律,为探寻规律,用RLW-1000型岩石三轴伺服刚性机,对不同倾角贯穿裂隙圆柱体标准试件进行常规三轴压缩试验,得到贯穿裂隙岩体的泊松比、峰值应变、峰后体积应变等的变化规律.经试验数据分析表明:峰后软化阶段的泊松比最大,峰值前弹性阶段泊松比最小,三个阶段的泊松比值与裂隙倾角基本无关;峰值应变基本随着裂隙倾角的增大而减小;峰后体积应变速率随着裂隙倾角的增大而减小.

Study on Post-peak Deformation Behavior of Rock Mass with Persistent Cracks

The post-peak deformation behavior of rock mass reflects the rules of yielding and weakening after the peak strength.In order to explore these rules,RLW-1000 rock rigidity triaxial servo testing machine was used to make conventional triaxial compression test on the cylindrical standard specimen with persistent cracks in different angles of inclination,from which the change laws of Poisson＇s ratio,peak strain,post-peak volumetric strain of such rock mass were obtained.The results of test data analysis show that Poisson＇s ratio is maximum in the post-peak softening stage and minimum in the pre-peak elastic stage,and the values of Poisson＇s ratio in the three stages are independent of the inclination of crack substantially; the peak strain decreases with the increase of the inclination of crack basically; the post-peak volumetric strain rate decreases with the increase of the inclination of crack as well.