Medium-thick ore body V-shaped top pillar sublevel rock drilling stage open stoping subsequent filling mining method

Abstract

The invention discloses a medium-thick ore body V-shaped top pillar sublevel rock drilling stage open stoping subsequent filling mining method. The medium-thick ore body V-shaped top pillar sublevel rock drilling stage open stoping subsequent filling mining method comprises the following steps of arranging ore blocks along the trend of an ore body, dividing the interior of the ore blocks into a first-step stope and a second-step stope, mining the first-step stope first, filling a goaf with high-strength filling bodies, forming a V-shaped top pillar during stoping of the first-step stope so as to facilitate filling and roof contact, stoping the second-step stope after the strength of the filling bodies of the first-step stope reach the design index, and filling with low-strength filling bodies after stoping of the second-step stope is completed. The medium-thick ore body V-shaped top pillar sublevel rock drilling stage open stoping subsequent filling mining method has the advantages that the stope filling roof-contact process is simple, the roof-contact quality is guaranteed, the roof-contact rate is high, and the stoping safety of the two-step stope can be effectively improved.

Description

technical field [0001] The invention belongs to the field of underground mining, in particular to a medium-thick ore body V-shaped top pillar segmented rock drilling stage open field and then filling mining method. Background technique [0002] The open-stop mining method in the stage of rock drilling in stages is one of the main mining methods for medium-thick 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and upward fan-shaped medium-deep holes are constructed in the sectioned rock drilling roadway, and each section is withdrawn from the upper wall to the lower wall at the same time, and the upper section is ahead of the lower section by a certain row distance.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 efficiency and low cost, so it is widely used. Before the filling mining method was popularized, when the medium-thick o...

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 medium-thick ore body V-shaped top pillar segmented rock drilling stage empty space subsequent filling mining method, aiming to solve the one-step mining method in the prior art in the segmental rock drilling stage open field subsequent filling mining method. The quality of field filling and roof connection is not high and the resulting problems such as collapse during the second-step stope recovery process

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