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In order to study the effect of mineral composition content on Microcrack propagation and static mechanical parameters of granite, a numerical model considering the meso-components of rock was established by combining thin section identification analysis and particle flow discrete element software PFC2D. The mesoscopic parameters of the model were calibrated by static uniaxial compression tests, and the effects of mineral component content on microcrack propagation, compressive strength and elastic modulus of granite were discussed. The results show that with the increase of quartz content, the failure mode of rock changes from “y” -shaped shear failure to “X” -shaped shear failure. With the increase of potassium feldspar content, the failure mode of rock changes from oblique section shear failure to “y” -shaped shear failure. With the increase of plagioclase content, the failure mode of rock changes from “V” -shaped shear failure to “X” -shaped shear failure. Biotite has the greatest influence on the failure mode of rock, with the increase of biotite content, the failure mode of rock changes from “V” cross shear failure to monoclinic shear failure, and then to composite shear failure. The elastic modulus of granite is negatively correlated with potassium feldspar and plagioclase, and positively correlated with quartz and biotite. Biotite has the greatest influence on compressive strength of granite, followed by plagioclase, then quartz, and potassium feldspar has the least influence. The Stiffness Heterogeneity Factor (SHF) is further introduced to analyze the relationship between mineral composition content and rock mechanical parameters. It is found that the peak stress and elastic modulus of rock decrease linearly with the increase of SHF.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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