含层理构造黑云变粒岩单轴压缩试验及数值模拟

应用离散元的接触粘结模型,系统分析了节理单元的强度特性,研究了不同加载方向下节理岩体的强度、破坏模式,并与室内试验结果进行了对比验证.研究发现:对于倾角45°分布层状节理岩体,节理单元强度低于岩石基质强度的15%时,节理对整体力学性质产生显著影响,对比室内试验,节理强度为基质强度约2%~4%时可以有效地模拟节理岩体的力学行为;随着岩层倾角的增加,层状岩体单轴抗压强度逐渐减小到逐渐增大的变化过程,呈"U形"分布.研究结果可为颗粒流离散元方法研究节理岩体力学特性提供参考.

Uniaxial Compression Test and Numerical Simulation of Stratified Biotite Granulite

The transversely isotropic rock samples with different dip angles were studied under uniaxial compression using the bonded particle model (BPM) of PFC2D. The strength and failure patterns were explored and compared with the experimental results. The results showed that the mechanical properties are affected significantly when the ratio of joint contact bond strength (both shear and normal) to rock contact bond strength is below 15%. The failure pattern is similar to the experimental result when the ratio falls into the range of approxiamtely 2%~4%. The uniaxial compressive strength decreases firstly at a certain value with the increase of joint angles and increases subsequently with a U-shape. The results can provide a reference for jointed rock mass with PFC2D code.