Open-stope subsequent filling mining method for thick and large ore body in segmented rock drilling stage

Abstract

The invention discloses an open-stope subsequent filling mining method for a thick and large ore body in a segmented rock drilling stage. Stopes are arranged in a direction vertical to the ore body; the first-step stope and the second-step stope are arranged at intervals; the first-step stope is firstly mined; a goaf is filled; then, the second-step stope is recovered; a goaf is filled; during the first-step stope recovery, the uppermost segment is firstly recovered; through controlling the hole bottom position of each positive row of blasting holes, a wedge-shaped top post is formed at the upper part during the recovery of the collapsed ore body; after the blasting of the uppermost segment is completed, each following segment is simultaneously recovered; after the recovery of the whole first-step stope is completed, high-intensity filling bodies are used for filling; after the intensity of the filling bodies of the first-step stope reaches the design index, the second-step recovery is started; during the second-step stope recovery, each segment is simultaneously recovered; and after the recovery is completed, low-intensity filling bodies are used for filling. The open-stope subsequent filling mining method has the advantages that the stope filling top connecting process is simple; the top connecting quality is ensured; the top connecting rate is high; the second-step stope recovery safety can be effectively improved, and the like.

Description

technical field [0001] The invention belongs to the field of underground mining, and in particular relates to a mining method for thick and large ore body segmented rock-drilling stage and subsequent filling, which is especially suitable for the mining of moderately stable ore rocks and above thick and large ore bodies. Background technique [0002] The open-stop and backfill mining method in the segmented rock drilling stage is one of the main mining methods for thick and large ore bodies with stable ore rocks. In this method, the ore body is divided into sections, and upward fan-shaped medium-deep holes are constructed in the sectioned rock drilling roadway, and each section is withdrawn from the upper wall to the lower wall at the same time, and the upper section is ahead of the lower section by a certain row distance. Step back blasting, caving ore is mainly released from the bottom ore structure. This method has the advantages of large stope production capacity, high e...

AI Technical Summary

Problems solved by technology

In order to ensure stope filling and roofing, mine engineers and technicians currently use many methods including: multi-point feeding, pumping forced roofing and expansion roofing, etc., but in reality, none of them can effectively guarantee the rate of filling and roofing. Therefore, during the second-step stope mining, stope collapse often occurs, the ore loss and dilution rate increases, and at the same time, the safety risk of stope mining increases

[0003] For this reason, the present invention provides a mining method for thick and large ore bodies in the segmental rock drilling stage and then backfilling, aiming at solving the problem of one-step stope filling and roofing in the prior art. The quality is not high and the resulting problems such as collapse during the second-step stope recovery process

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