含软弱夹层炭质板岩单轴压缩力学行为模拟研究

Simulation study on mechanical behavior of carbonaceous slate with weak interlayer under uniaxial compression

为探究含软弱夹层炭质板岩的单轴强度特性,本文运用ABAQUS软件建立炭质板岩单轴压缩数值模型,分别研究了岩样含软弱夹层及其数量、软弱夹层倾角、端部约束对炭质板岩单轴抗压强度的影响规律。数值计算结果表明:含软弱夹层会降低炭质板岩单轴抗压强度,且随着软弱夹层数量增加,单轴抗压强度呈减小趋势;随着软弱夹层倾角逐渐增大,单轴抗压强度先减小后增大,呈"U形"分布,软弱夹层倾角为0°时得到的单轴抗压强度最大,软弱夹层倾角在接近60°时单轴抗压强度最小;以接触面的摩擦系数μ模拟端部约束,结果表明随摩擦系数μ增大,单轴抗压强度先增大后趋于平稳,且端部约束对水平软弱夹层影响最小,对倾斜角为45°的软弱夹层影响最大。

In order to explore the uniaxial strength characteristics of carbonaceous slate with weak interlayers,the ABAQUS software is used to establish a uniaxial compression numerical model of carbonaceous slate to explore the soft interlayer and its quantity,the inclination angle of the weak interlayer,and the effect of end constraints on the carbon.Influence law of the uniaxial compressive strength of slate is revealed.Numerical calculation results show that weak interlayers will reduce the uniaxial compressive strength of carbonaceous slate,and as the number of weak interlayers increases,the uniaxial compressive strength decreases.As the inclination angle of the weak interlayer increases,the uniaxial compressive strength shows decrease tendency.The compressive strength firstly decreases and then increases,shows an"U-shaped"distribution.The uniaxial compressive strength obtains the largest value when the inclination angle of the weak interlayer is 0°,and the uniaxial compressive strength reaches the smallest value when the inclination angle of the weak interlayer is close to 60°.The friction coefficient k simulates the end constraint,and it is found that as the friction coefficient k increases,the uniaxial compressive strength firstly increases and then tends to be stable,and the end constraint has the least impact on the horizontal weak interlayer(0°),and has the greatest impact on the inclined weak interlayer(45°).