Fully mechanized excavation construction method for rock roadway

Abstract

The invention discloses a fully mechanized excavation construction method for a rock roadway. The method comprises the following steps of arranging blast holes parallel to the trend of the roadway on a roadway excavation tunnel face by using a loose split blasting technology; Filling an explosive in the blast holes; then detonating; increasing a fracture in to-be-excavated rock through the blasting to damage the rock around the blast holes; finally cutting the rock by using a fully mechanized excavation machine. The construction of the fully mechanized excavation machine is combined with the deep hole loose split blasting, so the fracture and the damage range in the rock are increased, the integrity of the rock is reduced, the efficiency of cutting the rock by the fully mechanized excavation machine is improved, the construction cost is saved, and the field operation environment is improved. The method is suitable for constructing various hard rock roadways by the fully mechanized excavation machine, particularly suitable for large-section inclined shafts and levels with a section area of being greater than 18m<2>.

Description

technical field [0001] The invention relates to a construction method for fully mechanized excavation in a rock roadway, in particular to a construction method combining the construction technology of a fully mechanized excavator and the technology of deep hole loosening and fracturing blasting. Background technique [0002] The methods used in mine rock roadway excavation construction include drilling and blasting method (abbreviated as drill and blast method) and comprehensive mechanized roadheader construction method (abbreviated as comprehensive excavation method). [0003] In the current rock roadway excavation, the drill and blast method accounts for more than 90%. The drilling and blasting method uses rock drills to drill holes and uses the dynamic and static effects of explosives to break rocks. During the construction process, it is time-consuming, labor-intensive, and easily produces dust, noise, gun smoke and other pollution; and the utilization rate of blast hole...

AI Technical Summary

Problems solved by technology

[0005] Due to changes in the geological structure, relatively hard sandstone (generally firmness coefficient f>7) will be encountered during the construction process. The rock mass contains quartz, diorite and other components, and the rock is firm and has good integrity; in such strata It becomes difficult for the fully mechanized excavator to cut rock, which is mainly reflected in the slow cutting speed and the sharp increase in the consumption of picks (knives on the cutting head). Yuan, in hard rock, the excavation footage of a small excavation team (8 hours) is generally 0.8m~0.9m, and the consumption of picks is 8~10, which greatly increases the construction cost of the roadway

[0006] Moreover, when cutting, the rock falls in the form of powder and mixes with water to form a thin mud, which affects gangue and head-on operations, and the powder diffuses in the air, affecting the health of workers

At the same time, high-load construction will cause fatigue damage to the main shaft of the fully mechanized excavator, reducing its service life

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