Treatment method of goaf in metal open-pit mine

Abstract

The invention relates to the field of goaf treatment, in particular to an open-pit metal mine goaf treatment method. The open-pit metal mine goaf treatment method comprises the steps that according to the rock mass and mineral deposit conditions of a mine, combining rock mechanical test data, the roof secure layer thickness of a goaf is determined; detection data of the goaf are obtained; a three-dimensional digital model of the mine is built and comprises a mineral deposit solid model, the mutual relation between the goaf and an open-pit bench and the mutual relation between the goaf and a slope; ground pressure monitoring data are obtained; according the roof secure layer thickness of the goaf, the detection data of the goaf, the three-dimensional digital model of the mine and the ground pressure monitoring data, the treatment occasion and scheme of the goaf are determined; and according to the treatment scheme of the goaf and topographic data acquired before explosion and after explosion, a treatment result of the goaf is evaluated through volume balance, and if the evaluation result is within an allowable error range, construction of the open-pit mine can be normally and orderly conducted. By adoption of the open-pit metal mine goaf treatment method, zero accident occurs during open-pit stripping and mining construction near the goaf, the ore recovery ratio is above 96%, and the ore dilution ratio is below 4%.

Description

technical field [0001] The invention relates to the field of goaf treatment, in particular to a treatment method for goafs in metal open-pit mines. Background technique [0002] At present, the method of domestic goaf management in metal open-pit mines is to grasp the location of the goaf through drilling, and then grasp the shape of the goaf through cavity scanning, and finally achieve the goal of treating the goaf through the filling method or the collapse of the surrounding rock of the roof. Purpose. Deficiencies: [0003] 1. For goafs without mining design data such as private excavation and random mining, the drilling work cannot be accurately positioned, and the drilling work is relatively large and expensive; [0004] 2. There is no test basis for the safety thickness reserved for open-pit mining in the upper part of the goaf, and the reserved security layer does not consider the influence of mine blasting vibration and different goaf roof shapes on the stability of...

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Problems solved by technology

[0003] 1. For goafs without mining design data such as private excavation and random mining, the drilling work cannot be accurately positioned, and the drilling work is relatively large and expensive;

[0004] 2. There is no test basis for the safety thickness reserved for open-pit mining in the upper part of the goaf, and the reserved security layer does not consider the influence of mine blasting vibration and different goaf roof shapes on the stability of the goaf;

[0005] 3. The thickness of the reserved security layer in the goaf is too large, which makes the treatment of the goaf unreasonable and difficult to deal with;

[0006] 4. There are problems such as secondary shipment and ore dilution in the goaf of open-pit mines by filling method, and the mining cost increases;

[0007] 5. At present, the mine goaf management and early warning and monitoring technologies are static, but the development and changes of the goaf are dynamic. The existing monitoring platform cannot monitor dynamically at all times, and there are great potential safety hazards

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