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综合利用MTS816.03试验系统与自制的破碎岩石压缩装置进行了不同岩性饱和破碎岩石的压缩试验,分析了岩性、轴向应力、粒径配比和加载速率4种影响因素下试样的压缩变形与分形特性。得出以下结论:1)矸石、泥岩和砂岩试样的压缩过程相似且可分为2个阶段,即为0~4MPa的快速变形阶段和4 MPa后的缓慢变形阶段;而灰岩试样的压缩过程变形速率均匀。2)在相同粒径配比条件下,随着轴向应力的增大,砂岩分形维数单调增大,岩石颗粒破碎程度加剧。轴向应力与分形维数之间关系可用指数函数拟合。3)在试样压缩过程中,Talbol幂指数越大,试样轴向位移越大;加载速率越大,试样轴向位移越小。4)在12 MPa轴向应力下,Talbol幂指数越大,试样压缩后的分形维数增量越大,被压碎的岩石颗粒越多;加载速率越大,试样分形维数越大,破碎程度越低。
The compression tests of rock saturated saturated and broken with MTS816.03 test system and self-made crushing rock compression equipment were carried out. The influences of lithology, axial stress, particle size ratio and loading rate on the compressive strength of specimens Compression and Fractal Properties. The conclusions are as follows: 1) The compression processes of gangue, mudstone and sandstone samples are similar and can be divided into two stages, that is, the rapid deformation stage of 0 ~ 4MPa and the slow deformation stage of 4 MPa; Compression process uniform deformation rate. 2) Fractal dimension of sandstone increases monotonously with the increase of axial stress under the same ratio of grain size, which aggravates the degree of rock particle crushing. The relationship between axial stress and fractal dimension can be fitted by exponential function. 3) During the sample compression, the larger the Talbol power index, the greater the axial displacement of the specimen; the greater the loading rate, the smaller the axial displacement of the specimen. 4) Under the 12 MPa axial stress, the larger the Talbol power index, the larger the increment of the fractal dimension after the compression of the sample, and the more crushed rock particles; the larger the loading rate, the larger the fractal dimension of the sample , The lower the degree of fragmentation.