Mining method of vertical deep hole double drawing and synchronous filling stage

Abstract

The invention discloses a vertical deep hole twice ore drawing synchronous filling stage mining method. An ore body is divided into stages along the inclination, and extraction units are distributed along the tendency. Through the extraction of a bottom structure of an upper stage part, a drilling chamber is formed, so that complete recycling of the ore quantity of the extraction units is realized. A loading and transporting roadway is driven from a transportation roadway at the footwall of a current stage to the bottom of an extraction unit, so that a trench bottom structure is formed. Detachable steel columns are distributed in parallel at the bottom end of the drilling chamber, which are used for fixing a polyurethane steel wire mesh. Firstly the polyurethane steel wire mesh is shifted to the top ends of the detachable steel columns and is close to rock mass at the top of the drilling chamber, and then a vertical medium-length hole is dug under the protection of the polyurethane steel wire mesh. Ore break by twice blasting is realized through layered charge, then the polyurethane steel wire mesh is shifted to the bottoms of the detachable steel columns, so as to cover ores, and mass ore drawing is realized. Meanwhile synchronous filling is implemented by taking the polyurethane steel wire mesh as an isolating layer. After ore drawing and filling are finished, scrap rock cementation can be performed through pressure grouting, conditions are provided for the extraction of adjacent extraction units, and complete recycling of ore bodies and ore quantity is realized. The method has the characteristics of high efficiency, low cost, good safety and good ore loss and dilution index.

Description

technical field [0001] The invention belongs to the technical field of mining, in particular to a mining method. Background technique [0002] As the mining depth of the ore deposit continues to increase, problems such as high ground stress and mining disturbance seriously affect the stability of the stope. At the same time, the ground subsidence caused by the underground goaf has seriously damaged the ecological environment and brought a series of problems to the mining area. Due to the increasingly stringent ecological protection, the advantages of the empty-field-and-fill mining method have been highlighted. The open-stop-and-fill mining method effectively combines the advantages of the open-stop method and the filling method. It can not only recover the ore to the maximum extent, but also ensure production safety, and at the same time effectively slow down the surface subsidence. It is more and more widely used in mines. [0003] However, the open-stop and then-fill mi...

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Problems solved by technology

[0003] However, the open-stop and then-fill mining method is essentially an open-stop mining method. Due to untimely filling, the remaining empty space may cause the collapse of the surrounding rock

For ore bodies and surrounding rocks with poor stability, the size of the mine can only be reduced to meet the safety conditions, but this will sacrifice the production capacity of the mine to a certain extent and increase the cutting strength of the mine

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