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Opencast mine end slope near-slope mining method

A mining method and technology for open-pit mines, which are applied in the mining of open-pit mines, earthwork drilling, and special mining, etc., can solve the problems of waste of coal resources, small slope angles of the side slopes, and low overall economic benefits of coal mines, etc. Wide practicability, reduced transportation cost, reduced stripping ratio effect

Active Publication Date: 2013-06-05
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

The side slope angle is too small, resulting in a serious waste of side coal resources and low overall economic benefits of the coal mine

Method used

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  • Opencast mine end slope near-slope mining method
  • Opencast mine end slope near-slope mining method
  • Opencast mine end slope near-slope mining method

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Embodiment Construction

[0013] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0014] Such as figure 1 , figure 2 , Figure 4 Shown: in the open-pit mining method of the present invention, in the process of open-pit mining, for the overall slope of the end walls 1 on both sides of the stope level, mining is close to the boundary according to the initially designed stability angle α, and the inner dump site The bottom pressing step 2 is followed up in time to shorten the distance to the bottom of the pit D , to reduce the overall height of the side slope of end side 1 H , on this basis, keep the coal seam mining height 3 unchanged, advance from the bottom of the sidewall 1 to the sidewalls on both sides, cancel the sidewall road 4, increase the slope angle to β, strip the rock mass 5, and recover the residual coal on the sidewall 6. The stripped rock mass 5 is transported to the inner dump 9 for disposal through the intermediate b...

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Abstract

The invention discloses an opencast mine end slope near-slope mining method. During an opencast mining process, for integral side slopes of end slopes on two horizontal sides of a mining field, near-border mining is carried out according to a stable angle alpha as in an initial design; according to a timeliness slope principle, inner dump is followed up in time; a pit bottom distance is shortened to a minimal safety distance Dmin required by mining, and integral height H of the side slope of the end slope is reduced; according to a side slope stable condition, the side slope angle is increased to beta; and near-slope mining is realized. The height of inner dump bottom layer slope-pressing step is 2-3 times that of mining working slope step. Stripped soil and rock are transported to the inner dump bottom layer slope-pressing step through a built soil-discharge bridge. With the method provided by the invention, side slope angle can be increased on a basis that slope end stability is ensured. Therefore, end slope residual coal can be recovered; stripping ratio can be reduced; and transportation cost can be reduced.

Description

technical field [0001] The invention relates to an open-pit mining method, in particular to a side-by-side mining method suitable for the side walls of the open-pit mine. Background technique [0002] As an important branch of the mining industry, open-pit mining undertakes more and more important coal mining tasks. Its essence is the complex process of constructing space on the crustal entity and constructing the mine entity in space. help and the corresponding slope. Due to the limitation of geological conditions, the overall side slope angle of the open-pit mine side is small, the stripping ratio is relatively large, the waste of residual coal on the side side is serious, and the amount of secondary stripping during mining also increases. The side slope angle is too small, resulting in serious waste of side coal resources and low overall economic benefits of the coal mine. Contents of the invention [0003] Technical problem: The purpose of this invention is to overco...

Claims

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Application Information

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IPC IPC(8): E21C47/00
Inventor 周伟才庆祥舒继森韩流
Owner CHINA UNIV OF MINING & TECH
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