Two-tunneling bidirectional stripping two-step pre-support mining method

Abstract

The invention provides a two-tunneling bidirectional stripping two-step pre-support mining method comprising the following steps of: firstly, performing construction and mining combination; secondly, performing one-step mining, pre-support and filling operation in the one-step mining; thirdly, performing two-step mining; and finally performing filling operation in the two-step mining. In the method, stope fillings in the one-step mining and the two-step mining can be used to implement a plurality of stripping filling for the construction of one closed wall, so that the number of closed walls is decreased, further, working efficiency is improved, and the filling cost is reduced; and furthermore, comparing cemented filling in the one-step mining and milltailing filling in the two-step mining with backstopping strip by strip in an approach method, the filling cost is reduced by over 40%, and the difficulty in wall sealing and filling operation is reduced under the condition that no top filling is needed.

Description

technical field [0001] The invention relates to the underground mining technology of metal mines, in particular to a filling mining method. Background technique [0002] At present, the mining of underground metal deposits at home and abroad is mainly based on the filling mining method. According to the geological conditions of ore rocks and the level of mining technology, the filling mining methods currently used mainly include the following methods: [0003] First, upward horizontal layered filling mining method. According to the geological conditions of the ore and rock and the level of mining technology, the upward horizontal layered filling mining method is subdivided into the following methods: ①. The ore body is stabilized by rock below medium thickness-upward horizontal layered filling mining method. Mine and rock conditions: the hanging wall and roof are stable, and the thickness of the ore body is ≤ 8m; mining method: the upper part of the air return shaft and the...

AI Technical Summary

Problems solved by technology

Ore and rock conditions: stable hanging wall and roof, ore body thickness ≥ 20m; mining standard method: vertical ore body intervals of 8-10m are arranged in strips, one-step mining room, two-step mining pillars, mining joints and mine pillars are arranged respectively Ventilation and drainage wells; mining: trolley drilling, mainly horizontal ore falling, combined with scraper trucks; filling method: one-step mining room cementation, two-step mining column bottom tailings + upper cementation layer; roof support : Long anchor cable pre-support, bolt trolley bolt follow-up support during mining; comprehensive evaluation: advantages: high production capacity, low loss and dilution rate of one-step mining room; disadvantages: difficult control of two-step mining column returning to the roof, The safety conditions of the stope are poor, the secondary dilution is serious, and the most prominent disadvantage is the large amount of mining engineering; application prospects: with the deepening of the mining depth, there are fewer and fewer suitable stopes

Ore and rock conditions: all kinds of ore bodies; mining method: central mining joint + two-wing air shaft + ore body footwall cutting road + vertical strip mining mining: 7655 or trolley rock drilling, tunneling mining, scraper truck Combined mining; filling method: one-step mining approach cemented filling, second-step mining approach bottom tailings + upper cemented layer; roof support: bolt follow-up support during mining, 7655 or trolley rock drilling; comprehensive evaluation: Advantages: Small mining section, safe stope operation, low loss and dilution rate; Disadvantages: large amount of rock drilling, low mining efficiency, high cost, poor safety conditions in the second-step mining stope, serious secondary dilution, practical application During the process, the original interval mining sequence was changed to backward mining one by one, and the filling body was fully cemented, resulting in increased filling costs; application prospects: the preferred method of mining broken ore bodies in domestic mines

Mine and rock conditions: extremely broken and high-yield ore bodies; mining methods: footwall air shafts, sliding mine shafts, and pedestrian drainage shafts; mining: 7655 or trolley rock drilling, tunneling mining, combined mining with scrapers and trucks; filling Method: high-strength filling body; roof support: steel bar hanging braided mesh injected into high-strength filling body; comprehensive evaluation: advantages: safe stope operation, lowest loss dilution rate; disadvantages: high cost of false roof of reinforced cemented filling body, filling The workload of preparation is heavy, the amount of rock drilling is heavy, and the mining efficiency is low; application prospect: the scope of promotion and application is very small

Mine and rock conditions: steeply inclined and stable hanging wall; rock drilling and blasting: fan-shaped holes, concentrated rock drilling, low cost of rock drilling and blasting; roof support: long anchor cable support + bolt support on the ore body hanging wall; Filling method: subsequent one-time filling, low cost of filling operation; mining equipment: remote control scraper; comprehensive evaluation; advantages: safe rock drilling operation, high stope production capacity; disadvantages: difficult maintenance of the upper plate, loss and dilution rate High; application prospect: This method is widely used in foreign mines, but it is difficult to popularize and apply it in domestic mines due to factors such as development projects and equipment prices

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