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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Underground structures |
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Characteristics of underground structures |
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Construction procedure of the adit |
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Excavation procedure of adit |
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Lining method |
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Construction characteristics of underground powerstation |
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Preparation before excavation |
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Construction procedure of vertical shafts |
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Construction procedure of inclined shafts |
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Characteristics of underground cavity blasting excavation |
1) Because of the influence of lighting, ventilation, noise and water seepage, the working conditions of drilling and blasting is bad. Blasting operation and supporting, mucking, supporting and transportation is in crossed progress, thus the construction scenes are restricted, and construction difficulties will increase. 2) The blasting action surface is few, and the clamping effect of rock mass is great, which will increase the difficulty of crushing rock, and increase the unit consumption. (3) The blasting quality requirement is high, so the overbreak should be strictly controlled, and the underbreak is not allowed.In addition, it is necessary to control the negative damage of blasting stone and shock wave. |
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Types of blast hole |
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Cut holes |
The cut holes is usually arranged in the middle and lower part of theexcavation section which must first be detonated in the whole section.Becauseof its dense blastholes and charge, a groove is first blasted out on the excavation |
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Form of cut blasting |
* Wedge cut * Tampered cut * Inclined cut * Parallel cut |
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Caving holes |
Caving holes are between cut holesand peripheral holes, and its precision requirement is relatively low. Its goal is to be burst out of rock/soil tothe smooth blasting layer |
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Parameters and design of smooth blasting |
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