Full
Outline
Blasting damage of surrounding rock is recognized as one of the key factors inducing roadway instability. For the roadways in Jinfeng Gold Mine with a burial depth of over 800 m, a numerical model of full-section blasting excavation was established by means of ANSYS/LS-DYNA, and five rounds of simulation calculations for full-section blasting excavation were carried out. Four typical positions were selected on the roadway section to analyze the cumulative damage effect of multiple blasting events on the surrounding rock. Based on the distribution characteristics of surrounding rock damage, a support method consisting of surrounding rock grouting+long anchor bolts+metal mesh+shotcrete was proposed, and its field application was carried out. The results show that in a single full-section blasting excavation, the blasting vibration from the first two blasting stages causes the expansion of the surrounding rock damage zone, which in turn leads to an accelerated increase in the displacement and damage of the surrounding rock during the last two blasting stages. During multiple full-section blasting excavations, existing damage zones invade the rock mass to be excavated in subsequent blasting operations. The new and existing damage zones connect and coalesce, and their expansion is accelerated, with the scope of the new damage zones increasing by approximately 20% compared with that of the previous blasting round. After the optimization of the support scheme, the reduction rates of convergence displacement of the roadway roof and floor and its two sidewalls reach 41.37% and 42.03% respectively. Anchor pull-out tests indicate that the anchor displacement of the new support scheme is reduced by 37.2% compared with that of the original support scheme, and the anchor rebound coefficient is significantly improved. This study can provide a reference for the calculation of surrounding rock damage and support design in excavation blasting of deep high-stress roadways.
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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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