Micro-disturbance cutting-free blasting method

Abstract

The invention relates to a micro-disturbance cutting-free blasting method which is applied to approach mining of a weak broken narrow lode. The micro-disturbance cutting-free blasting method comprisesthe following steps of (1) through measurement and data analysis, determining a position of a main weak structure face of a tunnel face; (2) digging slotting holes in two sides or one side of the weak structure face, and digging peripheral holes in the periphery of the tunnel face; (3) after carrying out drift stoping on a higher slice, laying a buffer layer with the thickness ranging from 10 to20cm on a bottom plate; (4) reserving wall protection ores with the thickness ranging from 10 to 20cm on two sides of an extracting drift; (5) adopting full-hole charging; and (6) adopting inverse differential initiation. Through the implementation of the steps, the damage degree of blasting vibration to a higher slice cemented filling layer and upper and lower wall rocks is solved fundamentally,and the difficulty and the cost of late supporting are effectively reduced. According to the micro-disturbance cutting-free blasting method provided by the invention, a weak structure of a rock mass body is used as a free face, and the wall protection ores are reserved on two sides of the extraction drift, so that the arrangement number of blast holes is greatly reduced, the construction amount oftrepanning and the consumption of explosives are further greatly reduced, and the comprehensive mining efficiency is improved.

Description

technical field [0001] The invention relates to the field of underground mine blasting, in particular to a micro-disturbance non-cutting blasting method, which is mainly suitable for the approach mining of weak, broken and narrow veins. Background technique [0002] When mining weak and broken narrow veins, the commonly used mining methods include upward approach filling mining method, downward approach filling mining method and upward horizontal layered filling mining method. Among them, the down-fill mining method has the highest proportion of ore. No matter what approach filling method is used for mining, it is necessary to dig holes and cut holes during rock drilling and blasting, and charge the whole hole for blasting. Due to the large vibration of the blasting, the surrounding rock of the weak and broken upper and lower walls will be more broken, and the cost and difficulty of stope support will be further increased, resulting in an increase in the entire mining cost ...

AI Technical Summary

Problems solved by technology

None of the above methods or methods can efficiently and low-cost solve the approach mining of weak, broken and narrow veins

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