节理产状对岩石单轴抗压强度的影响研究

Study on the Influence of Joints Occurrence on Uniaxial Compressive Strength of Rock

运用岩石破坏过程分析RFPA2D系统,采用控制变量法,分别研究了节理不同位置、方向和迹长对于岩石试件单轴抗压强度的影响。结果表明:试件节理位置对应值(裂纹尖端到受压面的距离)与抗压强度值有近似的线性关系;岩石试件中所含节理倾角不同时,试件的破坏模式不同,随着倾角的增大,试件的强度先降低随后增大;随着节理迹长与试件直径比值的增大,试件强度随之减小。数值模拟结果同物理试验结果相吻合,研究结果对于深入揭示断续节理岩石在单轴压缩下损伤破坏机制具有重要参考价值。

Using rock failure process analysis system（ RFPA2D）,the uniaxial compressive test model was constructed and the influence of the occurrence of joints,including joint location,joint orientation and joint trace length,on the uniaxial compressive strength was studied.The study shows that there is an approximately linear relationship between joint location values and the uniaxial compressive strength.Rock sample with different joint orientation gave different failure mode,with increase of dip angle,the strength of sample decreased first,then increased; the strength of the sample decreased with the ratio of joint trace length to diameter of the sample. Numerical simulations agreed well with the experimental results. The result in this paper is of great help to reveal the mechanism of damage and fracture of jointed rocks under uniaxial compression.