Goaf blasting method

Abstract

The embodiment of the invention discloses a goaf blasting method, relates to the technical field of blasting, and aims to improve the collapse blasting effect of a goaf. The goaf blasting method comprises the following steps: determining the drilling positions of blasting holes according to the number and the diameter of the blasting holes determined by the size of the goaf and the position of thegoaf; drilling the blasting holes with corresponding numbers and diameters downwards based on the drilling positions; when a drilling machine drills the blast hole bottoms to a goaf top plate by a preset distance, completing the drilling of the blast holes; putting an engineering plastic sleeve into one blasting hole, and enabling the outer wall of the engineering plastic sleeve to be in contactwith the inner wall of the blasting hole; determining the amount of blasting cartridges according to the determined amount of a soil layer above the goaf top plate and the determined lithology of thesoil layer; conveying a preset amount of blasting cartridges into the blasting holes; connecting a detonating cord of each blasting cartridge with a detonating controller, and arranging the detonatingcontroller in a safe area far away from the blasting holes; and detonating the blasting cartridges by using the detonation controller. The method is suitable for blasting the goaf.

Description

technical field [0001] The invention relates to the technical field of blasting, in particular to a goaf blasting method. Background technique [0002] Our country is rich in natural resources, and some resources are not only of various types but also huge in quantity. Usually, such resources are mined underground, and after mining, a goaf will be formed, while some precious mineral resources are stored on the surface , at this time, it is necessary to carry out open-pit mining for such resources. However, in the open-pit mining area, some coal kilns that may exist in the early stage are exploited in an orderly manner, resulting in a large number of goafs that may exist below the open-pit mining area. Due to the existence of goafs There will be potential safety hazards for the operators and equipment above. In order to ensure the normal operation of open-pit mining, it is necessary to carry out subsidence blasting for the goaf. [0003] At present, for the subsidence blasti...

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Problems solved by technology

[0002] Our country is rich in natural resources, and some resources are not only of various types but also huge in quantity. Usually, such resources are mined underground, and after mining, a goaf will be formed, while some precious mineral resources are stored on the surface , at this time, it is necessary to carry out open-pit mining for such resources. However, in the open-pit mining area, some coal kilns that may exist in the early stage are exploited in an orderly manner, resulting in a large number of goafs that may exist below the open-pit mining area. Due to the existence of goafs There will be potential safety hazards for the operators and equipment above. In order to ensure the normal operation of open-pit mining, it is necessary to carry out subsidence and blasting treatment on the goaf

[0003] At present, for the subsidence blasting treatment of the goaf, the specific blasting process such as the amount of blasting chemicals and the setting of blast holes is usually determined based on engineering experience. The effect of blasting in subsidence area is not ideal

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