Long-distance drilling and grouting method for covering rock stratum through single-access non-sill-pillar sublevel caving method

Abstract

The invention relates to a long-distance drilling and grouting method for covering rock stratum through a single-access non-sill-pillar sublevel caving method, and aims at solving the grouting problems of covering rock closed area, long distance and position change through the non-sill-pillar sublevel caving method; the long-distance drilling and grouting method adopts a method of drilling grouting and drilling channels on two sides of an uppermost sublevel mining roadway under the conditions of a single access and a straight mining roadway; a second sublevel covering rock is grouted through grouting drill holes, the grouting position is automatically adjusted to the position needing grouting along with stoping of each caving step pitch, the grouting purpose of long-distance and grouting position change of the covering rock in the non-sill-pillar sublevel caving method is achieved, the grouting thickness of the covering rock is about the height of one sublevel in the non-sill-pillar sublevel caving method, the grouting cost is low, the front waste rock can be effectively prevented from being mixed in an ore drawing process, the ore drawing effect is greatly improved, operation is easy, and the construction speed is high; and most of the single-access non-sill-pillar sublevel caving methods are adopted in the metal deposit branch veins, and the grouting method is relatively applicable.

Description

technical field [0001] The invention belongs to the technical field of caving mining methods in underground mines, and in particular relates to a long-distance drilling and grouting method for covering rock formations with a single-path, non-bottom-pillar, segmental caving method. Background technique [0002] Pillarless segmental caving method has the advantages of simple process structure, high mining intensity, high efficiency, high degree of mechanization, safety, and low mining cost, and has been widely used in the world. [0003] The standard non-pillar segmental 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. Sectional rock drilling, ore-breaking and ore-extracting work are all carried out in the mining roadway from the end of the mining roadway to the direction of the entry end of the mining roadway, and a smaller ore-breakin...

AI Technical Summary

Problems solved by technology

The problem of large ore loss and dilution in mining under the overburden rock has not been well resolved, and it is a major problem that plagues the mining industry

[0006] During the production process of the non-pillar segmental caving method, the overburden rock above the back-mined ore body must be grouted, and the upper segment can only be grouted for the lower segmental overburden rock. Due to the safety requirements of the non-pillar segmental caving method , the upper segment mining must be more than 20m ahead of the lower segment, or mining layer by layer, the grouting position has been covered by overburden rock, and people cannot enter the grouting position, and because of the non-pillar segmental caving method, only one smaller one is mined at a time. The step distance of the ore collapse, with the mining of each step distance of the mine collapse, the position where the grouting needs to be changed every time. Therefore, the overburden grouting of the segmental caving method without pillars is a closed area of ​​overburden rock, long-distance, and position changes The grouting problem is a big problem

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