Full
Outline
The joint bedding structures in the roadway will change the stress propagation and failure mode of the rock mass under the blasting load, and affect the cutting blasting effect and driving efficiency. In order to reveal the influence mechanism of bedding structure on the response of cut blasting, a quasi-three-dimensional finite element model of roadway considering joint dip angle was constructed based on the engineering background of a mine roadway. The ALE fluid-solid coupling algorithm was used to compare and analyze the characteristics of stress wave propagation and damage evolution under the conditions without bedding and with bedding. The results show that the bedding structure significantly weakens the stress wave coupling strength, and the average effective stress decreases by 61.64%, which causes the difficulty in forming effective penetration in the central area of the cut. Regarding this issue, an improvement scheme for adding auxiliary cutting holes was proposed. The results of numerical simulation and field test show that the improved scheme effectively enhances the energy aggregation effect in the central area of the cut, and forms a typical "through-type high-damage channel". The rock mass is more fully broken, the continuity is better, and the bulk rate is significantly reduced. The research results can provide theoretical support and engineering reference for cutting blasting design under complex structural plane 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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