Hard rock roadway wedge-shaped working face blasting construction method

By adopting a wedge-shaped working face blasting method in hard rock roadways, increasing the free face and optimizing the blasting sequence and charging method, the problems of low borehole utilization and poor blasting effect in hard rock roadway excavation were solved, achieving more efficient roadway forming and excavation.

CN122408558APending Publication Date: 2026-07-17YUNNAN PHOSPHATE CHEM GROUP CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YUNNAN PHOSPHATE CHEM GROUP CORP
Filing Date
2026-05-19
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In hard rock tunnel excavation, conventional smooth blasting technology results in low borehole utilization, poor blasting effect, and severe disturbance of the surrounding rock by blasting vibration, affecting the tunnel forming quality and stability control.

Method used

The wedge-shaped working face blasting method is adopted, which divides the working face of the roadway into two symmetrical wedge-shaped faces and arranges blast holes on the wedge-shaped faces. Reverse charging and electronic detonators are used for segmented delayed detonation to control the blasting sequence and charging method, increase the free face, and weaken the high resistance of hard rock.

Benefits of technology

It improved the utilization rate of blast holes and blasting efficiency, stabilized the single-cycle advance, reduced over-excavation and under-excavation, and improved the roadway forming quality and tunneling efficiency.

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Abstract

The present application relates to the technical field of roadway blasting construction, in particular to a kind of hard rock roadway wedge-shaped working face blasting construction method, S1, according to roadway design section, along the center line of roadway, working face is constructed as two symmetrical wedge-shaped faces, and blast hole is arranged on the two wedge-shaped faces in the profile of roadway, blast hole includes empty eye, slotting eye, auxiliary eye, peripheral eye;S2, reverse charging is carried out in each blast hole;Blast hole orifice is plugged using stemming, and the length of plugging is not less than the minimum resistance line of corresponding blast hole;S3, each blast hole is connected by constructing blasting network, and electronic detonator is used for segmented delay initiation;S4, initiation operation is carried out, and blast pile is cleaned up. By transforming the traditional plane working face into wedge-shaped working face along the center line, more and larger initial free surface is created under the same roadway section specification, and the high impedance of hard rock is effectively weakened, which creates favorable conditions for subsequent crushing.
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