Divided unloading and sublevel filling mining method based on rhombic stoping structure

Abstract

The invention provides a zoning unloading and sublevel filling mining method based on a rhombic stoping structure. A to-be-mined panel is provided with a middle section stope and divided into sublevel stopes, and zoning is carried out along the trend of an ore deposit; in the middle-section stope, the rhombic stoping structures are adopted for stoping from top to bottom in sequence, mining is conducted in a step-by-step and filling-while-mining mode, and the rhombic stoping structures between the subareas are firstly mined. According to the method, the rhombic stoping structures of the lower mining units between the subareas are mined in advance, so that unloading is achieved to relieve damage of horizontal tectonic stress to the lateral wall of the stope; the large-size rhombic stoping structure is large in structural parameter, the bearing capacity is remarkably improved, the problem that the lateral walls of the adjacent stopes of the soft and broken ore deposit are extremely prone to collapse is solved, and the safety production capacity of the stopes is improved. In addition, the rhombic stoping structures are distributed in an up-and-down staggered mode, ore loss can be reduced, and mining efficiency is improved. According to the method, the aim of safely, efficiently and economically exploiting the low-grade soft broken thick and large ore deposit at low cost under the condition of high-level tectonic stress is achieved.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a subarea unloading and subsection filling mining method based on a rhombus mining structure. Background technique [0002] In the process of mining weak and broken thick deposits in high-level tectonic stress environments, due to the high-level tectonic stress field, the stability of stopes has been extremely adversely affected; and with the continuous expansion of the mining scale of ore deposits, internal Stress concentration and changes in the stress field are very unfavorable to the mining of the ore body and the stability of the roadway. Therefore, in the mining process, it is easy to cause problems such as flaking and collapse of the side walls and roadway rocks of the adjacent stope, and the mining of the ore body. After excavation, the allowable exposure height and exposure space are small, and at the same time, the roof of the stope is prone to mining engineering problem...

AI Technical Summary

Problems solved by technology

The caving mining method has the advantages of low mining cost and high production efficiency, but its mining loss is large, and the upper surface must be allowed to caving; at the same time, the problem of surface caving and subsidence is prone to occur after mining, which will cause huge ecological hazards

However, the downward approach filling mining method requires a high-strength cemented filling body to form an "artificial false roof" as the direct roof of the mining approach below to effectively avoid roof caving and collapse; at the same time, it is necessary to control the approach specification to a small For example, in some mines, the specification of rectangular access is generally controlled within 5m×5m, and the specification of hexagonal access is generally controlled within 4m (upper and lower bottom width)×5m (height)×6m (waist width). In order to solve the collapse problem of the side walls adjacent to the approach; and this approach mining method often adopts the method of short excavation and short support, so the mining cost is high. For some weak, broken and thick deposits with low value, the mining cost is high and the production efficiency is low. The problem is very obvious, which seriously restricts the normal mining of such mines

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