Air column well completion back coming subsequent filling mining method

Abstract

The invention discloses an air column well completion back coming subsequent filling mining method of a thick and large metal ore bed under an ore rock unstable condition. Subsections are divided in a vertical level to carry out stope preparation; a stope is divided along the moving direction of a crushed body to be used as a back stoping unit; in each stope, back coming is carried out by a middle depth hole from an upper disc to a lower disc; the back stoping is carried out at the same time in the plurality of subsections; and the roof exposed area of the stope is controlled. When one section is exploited and ores are discharged, an air column is put down from an upper subsection rock drilling roadway and is distributed nearby an unexploded ore body; after filling and curing, 1-2 rows of cannon arrangement holes in the rear row are exploded for two times to form grooves. The stope width, the recovery length of each time, the filling material ratio, the strength of a filling body and the like are obtained by an ore rock mechanical parameter test, mechanical analysis and numerical value simulation analysis. The rock drilling, the explosion, the ore removal and the shoring are finished by trackless equipment; and the air column well completion back coming subsequent filling mining method has the characteristics of high exploiting safety, small resource loss, high mechanical degree, low labor intensity, great production capability, short back stoping time, and the like.

Description

technical field [0001] The invention relates to a method of backfilling after the air column is formed in a thick and large metal deposit under the condition of unsteady ore and rock. This method is mainly suitable for the mechanized mining of thick and inclined ore bodies with a dip angle of 30-50°, a horizontal thickness of more than 25m, a stable hanging wall but relatively broken ore bodies, and high operational safety, large production capacity, and high efficiency. Background technique [0002] At present, for the mining of extremely thick and large broken and inclined ore bodies with stable surrounding rocks on the hanging wall, the segmented caving method without bottom pillars, the segmented empty field subsequent filling method and the approach cemented filling mining method are commonly used at home and abroad, such as patent CN101718196 The “mining method for soft and broken ore bodies” disclosed in A adopts the mining method of segmental caving without pillars. ...

AI Technical Summary

Problems solved by technology

[0002] At present, for the mining of extremely thick and large broken and inclined ore bodies with stable surrounding rocks on the hanging wall, the segmented caving method without bottom pillars, the segmented empty field subsequent filling method and the approach cemented filling mining method are commonly used at home and abroad, such as patent CN101718196 The “mining method for soft and broken ore bodies” disclosed in A adopts the mining method of segmental caving without pillars. Although the method is simple in process, high in safety and large in production capacity, the disadvantage is that the loss rate of dilution is large. For high-grade ore Solid mining is not allowed, and it is easy to cause surface subsidence; patent CN 103075156 A discloses "a checkerboard-type mining house pre-protection roof to the middle and deep hole into the segmental filling mining method", this method will be extremely thick and broken The vertical direction of the ore body is divided into mining units to reduce the exposed area of ​​the hanging wall and the roof. In the segmental rock drilling level entry, bolts and metal mesh are used to pre-support the roof, and the medium and deep holes are used for mining. Although this method has a high degree of mechanization and a low loss rate Small, but cutting wells have to be re-drilled after each filling and maintenance, which takes time and effort and seriously affects the recovery progress

Patent CN101158287 A disclosed "a honeycomb structure cemented filling mining method" adopts a deformed downward approach cemented filling method, and divides the large-section hexagonal approach into upper and lower two blasting mining methods. After the upper part is blasted, the free surface and Compensate for space and improve blasting efficiency. Although compared with the traditional approach method, this method utilizes honeycomb structure with good stability, safe operation, large production capacity, high filling efficiency, and low loss rate, but the approach mining method has complicated procedures and complicated management.

[0003] There is currently no effective mining method for the mining of extremely thick, large broken and inclined ore bodies with stable surrounding rocks on the hanging wall, which require large production capacity, high safety, and low loss rate.

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