High-ground-stress large ore body downward sublevel filling mining method

Abstract

The invention relates to a high-ground-stress large ore body downward sublevel filling mining method. The high-ground-stress large ore body downward sublevel filling mining method comprises the stepsof layering the top of an ore body to be recovered; diving the ore body into sublevels and mid-levels for recovery; digging up a filling ventilation roadway and a drilling and ore discharging roadwayinside a working site, and performing primary filling after recovery is completed; before recovery is implemented, digging up a drilling chamber and drilling out vertical blastholes to form a cut vertical groove, forming upward sector-shaped blastholes in the drilling ore discharging roadway, and sequentially performing recovery section powder charging, detonation, ventilation and ore discharginguntil recovery of a recovery section is completed; building a filling retaining wall after recovery is completed, and starting operation in a next recovery section; filling the goaf after recovery ofevery section is completed to achieve a recovery and filling medium-length hole ore breakdown recovery process. Under the premise of improving the productivity of the working site, the high-ground-stress large ore body downward sublevel filling mining method achieves control over the exposed area of the goaf, avoids the problem of large-area and long-time exposure of the goaf and reduces the riskof instability of the working site.

Description

technical field [0001] The invention relates to the technical field of high-geostress ore body mining, in particular to a mining method for downward subsection filling of a large-scale ore body with high geo-stress. Background technique [0002] In the mining of large ore bodies with high ground stress, due to the complex engineering geological conditions and the difficulty of ground pressure management, the downward layered approach is usually used for mining followed by filling to reduce the exposed area of ​​the goaf and avoid stope failure. Stabilize damage and achieve the purpose of safe recovery. Although access mining can effectively control the ground pressure and achieve safe mining, it can only use horizontal shallow holes to drop the ore. The mining efficiency is low, the cost is high, the process is lengthy and complicated, and the increase of mine production capacity is restricted. It is difficult to realize the economy of resources. Efficient development. Co...

AI Technical Summary

Problems solved by technology

Although access mining can effectively control the ground pressure and achieve safe mining, it can only use horizontal shallow holes to drop the ore. The mining efficiency is low, the cost is high, the process is lengthy and complicated, and the improvement of mine production capacity is restricted. It is difficult to realize the economy of resources. efficient development

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