论文部分内容阅读
利用分离式霍普金森压杆实验系统,进行一系列的不同长径比砂岩冲击实验。对试验碎屑采用不同方法提取其信息,包括对粒径小于0.075mm的颗粒采用激光粒度分析仪。对受载后岩样破碎块度进行筛分统计,得到了该加载条件下岩石破碎的粒度分布。在此基础上,进一步计算相应破碎块度的分形维数,分别探讨了不同的长径比对分维数的影响。结果表明,砂岩破碎分维值在1.54到2.49之间,分维愈大,其粒度愈细。相同长径比岩石试件,岩石破碎分维值与试样的应变率线性相关,随应变率增大而增大。
Using a split Hopkinson pressure bar experimental system, a series of sandstone impact experiments with different aspect ratios were carried out. Different methods were used to extract information on test crumbs, including laser particle size analyzer for particles less than 0.075 mm in diameter. The fragmentation degree of the rock samples after being loaded was screened and the particle size distribution of the rock fragments under the loading conditions was obtained. On this basis, the fractal dimension of the corresponding fragmentation degree is further calculated, and the influence of different aspect ratios on the fractal dimension is discussed respectively. The results show that the fracture fractal dimension of sandstone is between 1.54 and 2.49. The larger the fractal dimension, the finer the grain size. The fractal dimension values of rocks with the same aspect ratio are linearly correlated with the strain rates of the specimens and increase with the increase of strain rates.