Description of underground blasting works

06-28-2022

1. The content of the topsoil section does not appear in the quota, and if relevant content is involved, it is adjusted by a coefficient of 0.8 to 0.85.

2. The quota is based on the average water inflow less than 5m3/h. When the water inflow is greater than 5m3/h, it will be adjusted by 5% for every additional 5m3/h.

3. The depth of the shaft is set according to 400m, the depth of the well is 400-600m, the number of labor is adjusted according to the coefficient of 1.11, the depth of the well is 600-1000m, and the number of labor is adjusted according to the coefficient of 1.25.

When the well depth is greater than 1000m, the number of laborers is adjusted by a factor of 1.45. The number of manpower for blind shaft excavation is adjusted according to the coefficient of 1.2. The shaft excavation is only classified according to the circle, and there are very few other shapes. If there are other shapes, the equivalent area of  the circle is used as a reference.

4. If there is an inclined well inclination in the quota, it is based on its quota, and if there is no inclination angle, it is formulated based on the inclination angle of less than or equal to 35°. When the inclination angle is greater than 35° and less than or equal to 45°, the number of labor is adjusted according to the coefficient of 1.2, and the material is adjusted according to the coefficient of 1.05. Adjustment; when the inclination angle is greater than 45°, multiply the factor of 1.12 on the basis of the second working condition.

5. The slope is made on the basis of the slope length of 1000m. When the length exceeds 1000m, the number of labors is adjusted by a factor of 1.1. The inclined shaft is formulated on the basis of the inclined length of 500m, and the length of the inclined shaft is 500-750m.

The amount of labor is adjusted by the coefficient of 1.1, and when the length of the inclined well is greater than 750m, the amount of labor is adjusted by the coefficient of 1.2.

6. The sky and slide shafts are formulated on the basis of the driving height of less than or equal to 60m. When the height is greater than 60m, every 10m is increased, and the adjustment is made in increments of 5%.

7. The underground chamber blasting is similar to the chamber blasting construction process. It is recommended to refer to the chamber blasting project quota, and increase the cost of taking safety measures for the underground air shock wave when using it underground.

underground blasting

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