Bottom-post-free sublevel caving method adopting reinforced concrete structure artificial false roof

Abstract

The invention relates to a bottom-post-free sublevel caving method adopting a reinforced concrete structure artificial false roof, which comprises the following steps that: sublevel extraction is carried out under a coverage rock layer, an upper sublevel extraction roadway and a lower sublevel extraction roadway are in rhombic staggered arrangement, and the rock drilling, the blasting and the ore removal are completed in the extraction roadways. The bottom-post-free sublevel caving method is characterized in that the reinforced concrete structure artificial false roof with the same width as the extraction roadways is continuously paved on a waste rock funnel control point at the tail ends of all inlet path extraction roadways with extraction inlet paths in right under positions along with the extraction of the extraction work surface, and the rock drilling, the blasting and the ore removal of the extraction roadways with the artificial false roof in the right above positions are carried out under the shielding effect of the artificial false roof. The reinforced concrete structure artificial false roof consists of a sectional steel supporter at the bottom part bottom layer as well as a rhombic reinforcing mesh and a concrete casting layer at the upper layer. The method has the advantages that the caved ore can be separated from the coverage rock in the upper part center region, and the waste rock funnel is effectively prevented from forming during the ore drawing, so the ore loss and depletion are reduced.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, and in particular relates to a segmental caving method without bottom pillars of an artificial false roof with a steel-concrete structure. Background technique [0002] Underground mining methods include three basic processes of mining, cutting and back mining. Usually, it can be divided into three categories: empty-pit mining method, filling method and caving mining method. It is one of the best mining methods for mining thick and large ore bodies, and it has been widely used in the world. The pillarless segmented caving method is to divide the ore body into several stages, and then divide the stages into several segments with mining roadways, and carry out mining segment by segment from top to bottom. Any ore pillars are left, and the segmented rock drilling, ore collapse and ore extraction are carried out in the mining roadway, which is safe and reliable; Small ore-breakin...

AI Technical Summary

Problems solved by technology

The artificial false roof used in the current caving method is a method of fully laying a false roof between the covering rock layer and the ore to isolate the covering layer from the caving ore. The construction is complicated and the material consumption is too large.

[0009] The waste rock funnel formed in the ore drawing process is the most direct cause of the ore loss rate and dilution rate, but there is a lack of research on the control of the waste rock funnel at home and abroad

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