软弱节理面对于岩石三轴抗压强度的影响研究

利用数值模拟软件,构建了岩石三轴抗压强度试验数值模型。基于应变软化模型,分析研究了结构面不同倾角、条数及侧限围压对于岩石试件三轴抗压强度的影响。结果表明:(1)岩石试件中所含节理面倾角不同时,岩石破坏模式不同。节理面对于岩石强度及变形的控制作用与节理面产状相关;(2)随着岩石中节理条数的逐渐增加,岩石抗压强度相应降低,但对于节理控制型岩石,其主要破坏模式仍以节理面上下部分相对滑移破坏为主;(3)随着围压强度的逐渐增加,含节理面岩石抗压强度逐渐增加,但增加幅值与节理面控制作用大小相关。

Study of the influence of joint on the triaxial compression strength

Using the numerical simulation software FLAC3D, the uniaxial compression test model was founded and the influences of dip, number and the confining pressure on the triaxial compression strength were studied using of the strain soft model. Conclusions can be drawn as follows: the failure model of the rock specimen is different when the dip of the joints is different, the control action of the joint to the strength and deformation of rock is relative to the angle of joint and stress. The increase of the number of joints, the triaxial strength of rock specimen is decreased, but the failure model of joint-control rock is slip of relative block. The triaxial strength of rock specimen increase with the values of confining pressure, but the increase amplitude is relative to the control function of joint.