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

Abstract

The invention relates to a top-filled high-end-wall pillarless sublevel caving method extraction technique. The high-end-wall pillarless 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 at each sublevel besides the lowest sublevel roadway in the group, 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. The high-end-wall pillarless sublevel caving method solves the problems of great loss dilution and surface subsidence of the caving method, has lower loss dilution and also has the advantages of simple structure, large production capacity and high production efficiency. Because tailings and broken stone are filled into the top, industrial wastes are utilized, which is beneficial to environmental protection.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, and in particular relates to a top-filled high-end wall and bottom-pillar-free segmental caving mining process. 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 period of time. [...

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Problems solved by technology

[0013] According to the knowledge of powder engineering, when the powder and gravel meet water, the cohesiveness will easily become larger, affecting its fluidity

[0014] 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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