Top-filled pillarless cornice end-wall sublevel caving method extraction technique

Abstract

The invention relates to a top-filled pillarless cornice end-wall sublevel caving method extraction technique. The pillarless cornice end-wall sublevel caving method is characterized by comprising the following steps of: (1) after ore drawing is completed, stretching a grouting tube deep into overlaying rocks by using a grouting device at both sides and front part of the end part of a mining roadway besides the lowest sublevel roadway, injecting and permeating one liquid medium into overlaying rocks surrounding the ore drawing port and the end wall, laying aside for 1-3 days, eliminating excessive water in the overlaying rocks, and performing blasting and actual mining in the next ore caving step; and (2) filling tailings and broken stone into the top of a gob so as to prevent surface subsidence. Compared with the traditional underground extraction method, the pillarless cornice end-wall sublevel caving method solves the problems of great loss dilution and surface subsidence of the caving method, has lower loss dilution index than the open-stope method and the filling method and also has the advantages of simple structure, large production capacity and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, and in particular relates to a stage-caving mining process with a bottom-pillar-less overhanging eaves end wall filled at the top. Background technique [0002] Underground mining methods include three basic processes of mining, cutting and mining, and are divided into three categories according to the method of ground pressure maintenance: open-field mining method, filling method and caving mining method. [0003] In the open-stop mining method, the ore block is divided into ore rooms and ore pillars in the process of mining. The stope mainly relies on the temporary ore pillars or permanent ore pillars for natural support, sometimes supplemented by artificial ore pillars. The mining pillar and the timely treatment of the goaf are suitable for mining deposits where the ore and surrounding rock are very stable. The goaf is allowed to have a larger exposed area within a certain p...

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Problems solved by technology

[0015] According to powder engineering knowledge, when crushed stone containing powder meets water, its cohesiveness will easily become larger, affecting its fluidity

[0016] However, for some new mines, or due to the different properties of the overburden rock, the overburden rock is not easy to be eroded or broken, and the content of gravel and powder in the overburden rock is relatively small. It is difficult to bond the overburden rock with water or glue, and the flow of overburden rock It is difficult to change the properties, and it is necessary to artificially increase the content of powder and gravel

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