Abstract：The influences of mechanical parameters of rock mass，strain-softening methods，mesh density and loading rate on stress-strain curves are analyzed with FLAC3D. Size scale，inner hole and end restraint effects are then studied based on optimized parameters. When post-peak softening modulus，dilation angle or mesh number increase，tensile strength or loading rate decreases，and softening section of uniaxial compressive stress-strain curves becomes sharper. A Λ-shaped failure form is generated near one end of the sample，and slenderness ratio has no obvious effect on strength when ends are free. For fixed-end sample，an X-shaped shear band is created in the middle part，and the strength is larger than that of free-end sample under the same confining pressure；however，the strength doesn't vary with slenderness ratio when slenderness ratio is greater than 2. On the contrary，both strength and average modulus decrease with slenderness ratio when the latter is less than 2. When the diameter of inner hole increases，average modulus has no obvious change，strength under the same confining pressure increases，and softening section of post-peak curve becomes steeper. The yield zones of intact sample and the hollow one propagate both from the centre to the side of the cylinder sample，and yield surfaces like two cones with the same peak value are formed in hollow sample ultimately. Simulated and test results agree with each other well，and this approach could be used for design and analysis of rock mass engineering.
郭保华. 岩样尺度、孔道及端部摩擦效应的数值分析[J]. 岩石力学与工程学报, 2009, 28(S2): 3391-3401.
GUO Baohua. NUMERICAL ANALYSIS OF SIZE SCALE，INNER HOLE AND END RESTRAINT EFFECTS OF ROCK SAMPLES. , 2009, 28(S2): 3391-3401.
