Stone drift driving method adopting technologies of water cutting and cut blasting

Abstract

The invention discloses a stone drift driving method adopting the technologies of water cutting and cut blasting. The method is guided by the idea of 'cut to drivage', and is realized through the following steps: arranging at least three blast holes on the middle part of a stone drift driving surface, wherein the partial positions of the blast holes are distributed in a circled manner; arranging one to two central holes at the central part circled by the blast holes, and also arranging breaking holes and peripheral holes; performing symmetrically distributed cut machining for two sides of a hole wall of each blast hole through the water cutting technology, so as to enable cuts to converge in the direction of an extended line; blasting cut blast holes, the central holes, the breaking holesand the peripheral holes in sequence to compete full section blast construction of the drivage drift in a cycle period. The method greatly improves the blast and drivage speed, ensures the construction quality and the construction level of the blast, achieves the safe and reliable construction process, and is especially suitable for drivage work of the stone drift with higher hardness or higher stress.

Description

technical field [0001] The invention relates to a roadway excavation construction method, in particular to a rock roadway excavation method combining water cutting and notch blasting technology. Background technique [0002] In the construction of rock roadway excavation, blasting operation is the most important construction method. Due to the limitation of roadway excavation blasting operation on a single free surface, during blasting construction, it is first necessary to cut grooves on the blast surface to prepare for subsequent blasting. The hole provides the space for the free surface and the rock to break and expand, so as to ensure the effect of blasting and excavation and increase the excavation speed. Therefore, cutting becomes the key to the speed of roadway excavation. [0003] In recent years, medium and deep hole blasting technology has made great progress and has been continuously promoted in various industries. However, due to the influence of the position of ...

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Problems solved by technology

[0003] In recent years, medium and deep hole blasting technology has made great progress and has been continuously promoted in various industries. However, due to the influence of the position of the deep hole during the excavation process, as the ground stress increases, the clamping effect of the surrounding rock around the roadway is also increasing. As a result, the cutting quality and cutting effect produced by the existing cutting technology are not good, especially in some medium-hard rock roadways with good integrity and deep positions, the confining pressure clamping effect is huge, and the rock It is complete and flawless, so that after the explosive is detonated, most of the energy propagates to the surroundings in the form of stress waves, and only the explosive gas and a small part of the stress wave energy can work on the rock fragmentation, the energy utilization rate is low, and the cutting depth is shallow, reaching It is less than the technical standard of medium and deep holes, which seriously limits the speed of roadway excavation

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