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Outline
To explore the damage distribution characteristics of rock mass caused by complex stress wave generated by blasting in soft and hard composite rock mass, a double-hole blasting model of composite rock mass composed of rock Ⅰ (relatively hard) and rock Ⅱ (relatively soft) was established based on LS-DYNA software. The damage law of rock under different initiation sequence and initiation delay time was discussed. The results show that in the composite rock mass, after the superposition of blasting stress waves, the stress waves in Rock Ⅰ override those in Rock Ⅱ and propagate further. The attenuation rate of effective stress in Rock Ⅰ is larger than that in Rock Ⅱ, resulting in the overall effective stress in Rock Ⅰ being smaller than that in Rock Ⅱ. The effective stress between the two blast holes in the composite rock mass decreases first and then increases, and the overall effective stress in Rock Ⅰ is always lower than that in Rock Ⅱ. The fractal dimension of rock decreases first and then increases with the increase of delay time. The fractal dimension of rock in Rock Ⅰ is larger than that in Rock Ⅱ when the blast hole is detonated first. The findings provide a reference significance for blasting construction in rock masses engineering under similar conditions.
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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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