a Diameter of the blasthole The reasonable diameter of the blasthole should be the same as other conditions, the drilling time of the 1m roadway is the shortest, and a good blasting effect is guaranteed.
When selecting the diameter of the blasthole, the quality of the rock drilling tool and the blasting material is mainly considered, as well as the general plan plan requirements for rock drilling and blasting work.
Under normal circumstances, when using air-leg rock drill, blast hole diameter of 38 ~ 43mm is appropriate to use a hydraulic rock drill drilling rig disposed rail or the outer rotary drilling, blast hole diameter of 45 ~ 50mm. The diameter of the blasthole is generally about 5 mm larger than the diameter of the nipple .
b Mud hole depth refers to the vertical distance from the working surface to the bottom of the gun hole. A reasonable blasthole depth should be determined according to the boring process equipment and the size of the roadway section. The effect of hole depth on rock drilling speed. In the case where conditions permit and blast efficiency can be guaranteed, the hole depth should be increased as much as possible to improve the cycle footage. Generally, the hole depth of the small-section roadway is 1.5~2.5m when using the air-leg rock drill , and the roadway with the section of 8m2 or more can be increased to 3~4m when drilling . When it is required to strictly follow the cycle chart, the hole depth can be determined by formula calculation or experiment according to the conditions of the total cycle chart and the rock drilling process time.
c Determination of explosive consumption It is related to factors such as roadway section, rock properties, blasthole diameter and depth.
The determination of the consumption of explosives can be calculated by the empirical formula or by the “Rain and Mineway Engineering Budget Quota†issued by the state. The blasting method specified in the project budget quota and the consumption quota of explosives, fire detonators and fuses under the conditions of the excavation section. However, for a certain unit, a reasonable amount of blasting material consumption is best determined by actual measurement, comprehensive blasting effect and economical effect of saving materials.
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