Method for weakening strength of hard rock

Abstract

The invention discloses a method for weakening strength of hard rock, comprising the following steps: setting blasthole groups along the axial direction of a hard rock tunnel in the tunneling fracture surface; filling explosives in each blasthole of the blasthole groups and sealing the blastholes; setting off explosives in each blasthole in sequence so as to weaken the hard rock strength of tunneling fracture surface of the hard rock tunnel. The method of the invention is designed for addressing the technical defect that in the prior art, when a complex driving device tunnels hard rock with protodyaknove's number reaching or surpassing 8, the cutting part of the complex driving device is likely to be seriously worn, which affects stone drifting speed and weakens strength of hard rock, reduces abrasion of the cutting part of the complex driving device, ensures continuous working of the complex driving device and accelerates stone drifting speed.

Description

Technical field [0001] The invention relates to hard rock strength weakening technology, in particular to a hard rock strength weakening method for reducing the wear of fully mechanized excavating equipment and ensuring continuous operation of fully mechanized excavating equipment, and belongs to the technical field of coal mine engineering. Background technique [0002] Rock tunnel excavation occupies a very important position in coal mine construction and production. Specifically, in the construction of new mines, rock tunnel excavation works generally account for about 40%-50% of the total construction of new mines, and 35%-50% of the entire construction period of new mines; in production mines, rock tunnels The tunneling engineering volume generally accounts for about 25% of the total production engineering volume. Therefore, for the construction of new mines, the speed of rock tunnel excavation can be accelerated, and the rapid construction of rock tunnels can be realized. ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for weakening the strength of hard rock, which is used to solve the problem that the cutting parts of the fully-mechanized excavation equipment will be damaged when the fully-mechanized excavation equipment is used to excavate hard rock with a Platts coefficient of 8 or greater than 8 in the prior art. The technical problem of causing severe wear and thus affecting the driving speed of the rock roadway has achieved the purpose of weakening the strength of the hard rock, reducing the wear of the cutting parts of the fully mechanized excavating equipment, ensuring the continuous operation of the fully mechanized excavating equipment, and increasing the driving speed of the rock roadway

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