不同级配破碎煤岩体分形特性试验研究

Fractal characteristics of different grade coal blending rock

研究不同级配下的破碎煤岩分形特性及压实破坏前后煤岩分布分形维数变化规律。利用自制破碎煤岩压实装置,结合DDL600电子万能试验机和计算机采集系统等,对不同级配下破碎煤岩进行压实特性试验研究,分析了不同级配与轴向应力对破碎煤岩压实后粒度分布的影响规律,建立了破碎煤岩分形维数D与轴向应力的关系。结果表明:Talbol幂指数越大,粒度分布分形维数越小,分形维数随轴向应力增大而增大,且各级配下的分形维数逐渐趋于稳定;在同一载荷下,随着Talbol幂指数的大,分形维数逐渐减小且孔隙结构趋于稳定。

The self-made fractured coal rock compaction device,DDL600 electronic universal testing machine and computer acquisition system are used to study the fractal characteristics of fractured coal rock under different gradation,compaction and damage before and after coal distribution. The experimental study on compaction characteristics of fractured coal rock under different gradation is carried out. The effect of the different gradations with the axial stress on particle size distribution of broken coal and rock after compaction is analyzed. The relationship between the fractal dimension of fractured coal rock D and axial stress is established. The results show that the greater Talbol exponent,the smaller particle size distribution fractal dimension; the fractal dimension increases with axial stress growths; the fractal dimensions at all levels tend to be stable; in the same load,the fractal dimensions gradually decrease,and the pore structures tend to be stable with the increase of Talbol exponents.