Blasting method for shallow-buried goaf of strip mine

Abstract

The invention provides a blasting method for a shallow-buried goaf of a strip mine and belongs to the technical field of engineering blasting. The blasting method comprises the following steps that step1, properties, occurrence conditions and geometric spatial characteristics of ores around the goaf are confirmed; step2, the safety thickness of a top plate above the goaf is confirmed, perforating equipment is selected, and a perforating scheme is designed; step3, hole net parameters of goaf top plate loose blasting and lateral throwing blasting are confirmed, and a charging structure and a detonating network are designed; step4, the muck pile size is estimated; step5, goaf volume balance calculation is performed, and the blasting collapse volume is confirmed; step6, blast hole arranging, charging and filling are performed; and step7, the detonating network is connected, detonating is performed, and the caving filling effect is observed and recorded. According to the blasting method for the shallow-buried goaf of the strip mine, the lateral free surface condition created by the underground goaf is fully utilized, lateral throwing filling is assisted while top plate caving filling is implemented, single-side, double-side or multi-side lateral blasting throwing filling can be implemented, the filling rate of the underground goaf is increased, and secondary manual filling is reduced or avoided.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and in particular relates to a blasting method for a shallow-buried goaf in an open-pit mine. Background technique [0002] At present, there are many underground goafs in many mines. In recent years, due to the lack of centralized integration of mineral resources around the mines, irregular mining has further expanded the number of underground goafs. Instability is an extremely serious geological disaster in mines. Therefore, the existence of these goafs poses a serious threat to the safety of mine equipment and personnel, and also brings great difficulties to the organization and implementation of mining plans. However, the current domestic mine engineering does not consider the filling efficiency when blasting and caving the goaf. For the shallow buried goaf after the roof blasting, the single goaf roof collapse technology is often used because the volume of the bulk is not enough...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many underground goafs in many mines. In recent years, due to the lack of centralized integration of mineral resources around the mines, irregular mining has further expanded the number of underground goafs. Instability is an extremely serious geological disaster in mines. Therefore, the existence of these goafs poses a serious threat to the safety of mine equipment and personnel, and also brings great difficulties to the organization and implementation of mining plans.

However, the current domestic mine engineering does not consider the filling efficiency when blasting and caving the goaf. For the shallow buried goaf after the roof blasting, the single goaf roof collapse technology is often used because the volume of the bulk is not enough to completely fill the goaf. As a result, deep subsidence pits are formed after the explosion, resulting in an increase in the amount of secondary manual filling, which not only fails to completely eliminate hidden dangers in production safety, but also increases the investment and construction period for goaf management

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