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采用颗粒流离散元软件PFC2D,通过Fish语言编写程序,模拟了矽卡岩岩样3级不同加载速率下的室内单轴压缩试验,并分析了其静态加载速率效应。模拟结果表明:模拟得到的岩样破裂形态、应力-应变曲线、峰值强度变化等与试验结果较为吻合;加载速率增大,峰值强度及其对应的应变增大,且在10-2数量级内增幅明显,峰后变形能力减弱,弹性模量、泊松比基本不变;加载速率增大,临界扩容应力和扩容点对应应变增大,扩容曲线软化段都很平缓,体积膨胀急剧;岩样主要破坏形态为剪切破坏,且随着加载速率增加,由单一剪切破裂过渡到共轭剪切破裂,更易形成锥形破坏。研究结果可为相关岩体的室内试验及岩土工程的稳定性评价提供参考。
Using particle flow discrete element software PFC2D, the program was programmed by Fish language to simulate the indoor uniaxial compression tests of skarn rock samples under three different loading rates and to analyze the static loading rate effect. The simulation results show that the fracture morphology, the stress-strain curve and the peak intensity change of the rock sample are in good agreement with the experimental results. The loading rate increases, the peak intensity and its corresponding strain increase, and the amplitude increases by 10-2 Obviously, the deformability decreases, the elastic modulus and the Poisson’s ratio remain unchanged after the peak; the loading rate increases, the critical strain increases and the corresponding strain increases, the softening section of the expansion curve is gentle and the volume expands rapidly; The failure mode is shear failure, and as the loading rate increases, the transition from a single shear fracture to a conjugate shear fracture is more likely to cause conical failure. The results of this study can provide reference for indoor tests and geotechnical stability evaluation of related rock mass.