Continuous natural caving mining method for unsteady extra-thick large ore bodies

Abstract

The invention belongs to the technical field of metal mine underground mining and relates to a striding continuous natural caving mining method for an unstable super-thick large ore bodies. A preliminary mining project of the striding continuous natural caving mining method comprises a monitoring level, an undercut level, an ore-drawing level and a loading-transporting level which are arranged from top to bottom. The monitoring level is located in an ore body hanging-side rock mass or on the ground; the undercut level is located in the ore bodies of the ore body heading-side boundary; the ore-drawing level and the loading-transporting level are located in an ore body heading-side rock mass and communicate through ore-drawing drop shafts; and any other preliminary mining projects can be not arranged within the height of the vertical thicknesses of the ore bodies. The overall mechanical degree is high, personal and equipment do not enter large space for operation, ore columns and a goaf are not left, the mining comprehensive productivity is high, and the mining cost is low; and in addition, the construction efficiency of the whole project can be effectively improved, the caving area range can be conveniently controlled, the safety problems are avoided during maintenance of the undercut space ore columns and operation of personnel in undercut space, and the pressure bearing state of a bottom structure project is improved.

Description

technical field [0001] The invention belongs to the technical field of low-lying mining in metal mines, and in particular relates to a step-by-step continuous natural caving mining method for an unstable extra-thick large ore body. Background technique [0002] Natural caving mining is to use the combined action of the self-weight stress of the overlying strata, geological structural stress, and the stress migration caused by the excavation disturbance of the shaft and the weak surface to cause rock mass damage until it collapses, so as to achieve the goal of mining. And through the appropriate bottom structure and loading equipment, the ore is released, loaded and transported from the stope, and at the same time, the continuous process of collapse, mining and transportation is guaranteed. As a large-scale, low-cost, and high-tech mining method, it has the advantages of large production capacity, easy organization and management, safe operation, and low mining cost. For unst...

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Problems solved by technology

[0003] The disadvantage of this type of mining method is that before mining, it is necessary to conduct in-depth research on the collapsibility of ore rock, caving mechanism, ore block structure parameters, and bottom structure stability in combination with mine geomechanics conditions, ore body occurrence characteristics, and surrounding rock characteristics. A large number of mining and cutting projects need to be completed (compared with other mining methods, this method has a small amount of mining and cutting engineering, which is a low-cost and high-efficiency mining method, which is an advantage. It can increase the mining conditions that allow surface subsidence), stope Long preparation time, large initial investment, and certain conditions of use, otherwise it is difficult to achieve the expected technical and economic effects

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