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A method of backfilling the open-pit pit after converting from open-pit to underground caving mining

A technology that converts open-pit into underground and open-pit. It is applied in underground mining, surface mining, earth drilling and mining, etc. It can solve problems such as backfilling, single mining area or multiple open-pit, underground waste rock discharge, etc., so as to reduce impact and avoid disadvantages. Influence, the effect of increasing thickness

Active Publication Date: 2021-02-19
SHEN KAN QINHUANGDAO GENERAL ENG DESIGN & RES INST CORP MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method of backfilling the open-pit after mining by the caving method from open-pit to underground mining, which solves the problems in the prior art of underground mine production by the caving method of open-air to underground mining in which a single mining area or multiple open pits and multiple mining areas are recovered simultaneously. At the same time, the problem of backfilling the open pit is also solved to supplement the overburden of caving mining, avoid the impact of cycle power impact disasters on underground mining, and solve the problems of underground waste rock discharge.

Method used

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  • A method of backfilling the open-pit pit after converting from open-pit to underground caving mining
  • A method of backfilling the open-pit pit after converting from open-pit to underground caving mining
  • A method of backfilling the open-pit pit after converting from open-pit to underground caving mining

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Embodiment 1

[0031] Such as Figure 1 to Figure 3 As shown, Embodiment 1 of the present invention provides a method for backfilling open-pit pits after conversion from open-pit to underground caving mining, including the following steps:

[0032] S1: According to the occurrence conditions of the ore body 9, arrange each mining face 10 for underground mining in one or several strips, and delineate one or several moving areas 2 on the upper part of the mining face 10;

[0033] S2: In order to ensure the safety of backfilling operations, a safety belt 1 is drawn outside the movement area 2;

[0034] S3: The area outside the safety belt 1 in the open pit is used as a backfill rock discharge area for waste rock discharge;

[0035] S4: Since the mining face 10 is moving, the moving area 2, the safety belt 1, and the backfill area 3 all move with the movement of the underground mining face 10, which is essentially a dynamic partition, and the backfilling operation is a trailing operation;

[00...

Embodiment 2

[0054] The open-pit backfilling method after the open-pit-underground caving method mining in Example 2 of the present invention is applied to the open-pit backfilling project of the open-pit-underground caving method mining in No. 1 stope of Heishan Iron Mine. Before this project was carried out, in the design of the No. 1 stope of the Heishan Iron Mine, the rocks produced in the production were all discharged to the dump site. Northwest of China, with a capacity of 1.36 million m 3 , using winches and bulldozers to discharge rocks, but it is difficult to discharge rocks and there is no suitable dump site for rocks from many nearby mines. The specific implementation of the open pit backfilling method after applying the open-pit to underground caving method of the embodiment 2 of the present invention in the No. 1 stope of Heishan Iron Mine will be described in detail below.

[0055] (1) Current conditions

[0056] Heishan No. 1 stope was originally open-pit mining, and it w...

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Abstract

The invention discloses a method for backfilling open-pit pits after being mined by the open-pit-underground caving method. Delineate one or several moving areas on the top of the surface, draw a safety belt outside the moving area, and use the area outside the safety belt in the open pit as the backfill and rock drainage area. Moving and moving, the backfilling operation is a trailing operation. According to the boundary of the lowest mining section after the ore is mined, the surrounding rock deformation boundary is delineated, and the open pit within the surrounding rock deformation boundary is backfilled before the lowest mining section ore is mined. Determine the mining sequence and backfilling operation sequence of each subregion, and arrange the backfilling and rock removal transportation system. The invention satisfies the requirement of mining the overburden in the well, avoids the adverse impact on the environment caused by waste rock being discharged to the dump site, and is beneficial to the safety of the mining in the well.

Description

technical field [0001] The invention relates to the technical field of open-pit backfilling, in particular to a method for backfilling open-pit pits after being mined by an open-pit-to-underground caving method. Background technique [0002] When converting from open-pit to underground caving mining, in order to ensure the safety of the mining level, and at the same time to prevent wind leakage, prevent cold and keep warm, it is necessary to form a covering layer with a height of not less than two sections. During the mining process of the underground ore body, due to the mining of the ore body, the covering layer moves down, which breaks the stress balance state of the original open-pit mine slope, and the stress is constantly adjusted, which easily leads to cyclic dynamic impact disasters. There are several techniques for backfilling the open-pit after the existing open-pit to underground caving mining method: [0003] Technology 1: Before underground mining, the open-pit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/32
CPCE21C41/32
Inventor 张建勇李新成王思和卢纯忠屈晓朋覃伟皓颜廷宇
Owner SHEN KAN QINHUANGDAO GENERAL ENG DESIGN & RES INST CORP MCC