Full
Outline
In geotechnical engineering, instability failure often occurs in multi-layer rock mass at the same time, and its different combinations, lithology and other factors will affect the development trend of cracks. The discrete element PFC2D software was used to establish the sample model, and the uniaxial compression experiment was simulated to reveal the influence of the proportion of soft and hard rock strata on the mechanical properties, failure characteristics and energy evolution law of rock samples. The results are drawn as follows. Firstly, the proportion of hard rock in the layered composite rock sample is the main factor affecting the peak strength of the rock sample. As the proportion of hard rock increases, the peak stress of the rock sample gradually increases. Secondly, the number of microcracks and the total input strain energy of the layered composite rock sample are the minimum when the thickness ratio (R) of the adjacent rock layer is the smallest, indicating that the decrease of R will lead to the early failure of the rock sample. Thirdly, the elastic energy consumption ratio K is introduced into the energy analysis of layered composite rock samples, and it is verified that the increase of K value would be used as an early warning signal for rock deformation and failure. Fourthly, the main failure mode of the layered composite rock sample is tension-shear mixed failure, and the macroscopic cracks generally originate in soft rock part. Then, due to the sharp increase of the transverse strain of the soft rock part, the cracks penetrate into the hard rock part, revealing that the failure of the rock sample is a process of gradual loss of bearing capacity. The research results can provide a reference for practical engineering.
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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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