Upward double layered approach filling mining method with retrievable support cover for broken ore body

Abstract

The invention provides a mining method for filling a broken ore body with a recyclable bracket covering an upward double-layered approach. Start digging and mining from the lower part of the layer along the ore body trend, and erect the cover support as the mining face advances; after mining to the stope boundary, dig upward blastholes in the gap at the top of the cover support, disassemble and recover the blasthole after charging. The cover support below the hole, and then the upper layer is mined in a sideways collapse and retreat style. After the mining of the two layers is completed, the cemented filling will be carried out. In this way, the present invention changes the mining and filling of the upward single approach to the mining and filling of the upward double-layered approach. On the one hand, it reduces the filling and maintenance time, and speeds up the overall recovery efficiency of the stope; on the other hand, it adopts a detachable cover support to ensure the smooth implementation of mining and filling in the upward double-layered approach. Only the bottom layer is supported in every two layers, which reduces the support operation time, and the support can be retracted and recovered, which greatly reduces the support cost.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a mining method for filling an upward double-layered approach under the cover of a broken ore body with recoverable supports. Background technique [0002] When mining weak, broken and poorly stable ore bodies, the down-filling mining method is generally adopted. In order to ensure the safety of filling and mining in the downward approach, the mine usually adopts dense wooden support for each approach, and a high-strength filling body is required on the top. However, under the condition of dense support of wooden frames, the working space of mechanized equipment will be small, and the heat dissipation and ventilation of pit logs will be difficult to rot. In addition, the dense support of two gangs of pit logs on the approach will reduce the cementation effect of the filling body, and the bottom mining operation space will be affected by the top filling. The body press...

AI Technical Summary

Problems solved by technology

This method greatly speeds up the efficiency of stope operations, but this method is mainly suitable for thick and large ore bodies, and due to the severe fracture of ore bodies, this method will cause potential safety hazards

[0004] Therefore, it is urgent to provide a mining method for broken ore bodies to solve the problems of high support and filling costs, difficult construction techniques, and insufficient space for mechanized equipment.

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