冻结砂岩单轴压缩试验及剪应变局部化带数值模拟

Uniaxial Compression Test of Frozen Sandstone and Numerical Simulation of Shear Strain Localization Belts

除了对不同温度下冻结砂岩试件剪应变局部化带的形成进行试验研究外,还基于应变软化理论,以FLAC3D自带的Mohr-Coulomb本构模型为基础,对冻结砂岩剪应变局部化带的形成过程进行了数值模拟。结果表明:冻结砂岩单轴抗压强度总体随温度降低而提高,但过低的冻结温度并不能明显提高其强度;冻结砂岩试件剪应变局部化带的形成是一个渐进变化的过程,其最终的破坏形式为剪切破坏,破坏角约为45°。

In addition to the experimental study on the formation of shear belt in frozen sandstone under different temperatures, also simulates the formation process of shear strain localization belts based on the strain softening theory and as the foundation of the Mohr-Coulomb constitutive model in FLAC^3D. The results show that the uniaxial compressive strength increases with the decrease of temperature, but the freezing temperatures is too low to increase the strength clearly. The formation process of the localized shear belts of frozen sandstone specimens is a gradual process and its ultimate destruction form is shear failure, with a rupture angel is about 45°.