一维动静组合加载下岩石力学特性的数值模拟研究

发布时间：2018-11-12 07:06

【摘要】：为了探究一维动静组合加载下岩石的力学特性,采用数值模拟方法,对岩样进行模拟,以岩石单轴抗压强度的0%、20%、50%和80%作为轴压值,分别设置动荷载值进行加载。通过对模拟的应力-位移曲线、强度、应变、破坏特征进行分析,得出以下结论:在不同的轴压和动载下,峰后曲线出现应变回弹,应力跌落,峰后塑性3种变化;动态抗压强度随着应变率的增大而提高,随着轴压的增大,动态抗压强度呈现先增大后减小的趋势;轴压一定时,改变动载幅值,应变曲线出现先增大后减小、峰后曲线不随加载时间变化、一直增大3种变化趋势;无轴压下岩样的破坏模式为拉伸破坏,有轴压下岩样的破坏模式为压剪破坏。
[Abstract]:In order to investigate the mechanical properties of rock under one-dimensional dynamic and dynamic combination loading, the rock samples were simulated by numerical simulation method, and the axial compression values were taken as 50% and 80% of the uniaxial compressive strength of the rock. Dynamic load values are set to load. By analyzing the simulated stress-displacement curve, strength, strain and failure characteristics, the following conclusions are drawn: under different axial compression and dynamic load, the post-peak curve has three changes: strain springback, stress drop and post-peak plasticity; The dynamic compressive strength increases with the increase of strain rate and increases with the increase of axial compression. When the axial pressure is fixed, the dynamic load amplitude changes, the strain curve increases first and then decreases, and the post-peak curve does not change with the loading time. The failure mode of rock samples without axial compression is tensile failure, and the failure mode of rock samples with axial compression is compression and shear failure.
【作者单位】：云南省建筑科学研究院;昆明理工大学;
【基金】：国家自然科学基金项目(41362013,41672303)
【分类号】：TD315.3

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