It is an important content in the course of "Blasting Engineering" to master the dynamic mechanical response of rock (body) under the action of blasting dynamic load. Since students majoring in civil or mining engineering lack basic theories such as wave mechanics and rock dynamics, the teaching effect is poor when the knowledge of dynamic mechanical properties of rock is explained in class, which will affect the subsequent learning of rock breakage mechanism. Therefore, the Split Hopkinson Pressure Bar (SHPB) experiment of rock materials is applied to the practical teaching of “Blasting Engineering”. By measuring the dynamic compression strength of rock samples and observing the failure forms of specimens, students are guided to understand the dynamic mechanical response of rock materials under different strain rates. The finite element software LS-DYNA is also used to simulate the SHPB experiment, and the process of stress wave propagation and rock failure is reproduced to achieve the demonstration function of dynamic impact. Practice shows that this teaching method enables students to intuitively perceive the stress wave propagation, clearly understand the dynamic failure mechanism of rock, master the relationship between dynamic mechanical properties of rock materials and strain rate, and lay a foundation for further study of blasting engineering theory.
| 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 |