Backfill handling method for activity subsidence area of mine

Abstract

The invention discloses a backfill handling method for an activity subsidence area of a mine. The backfill handling method is characterized in that mixed slurry is prepared by mixing high-concentration tail mortar which is obtained by densely dehydrating low-concentration tail mortar through a deep cone thickener (1) with rough aggregates and concrete which are discharged by an aggregate silo (2) and a power silo (3) through a mixer (4); and the slurry is pumped to the subsidence area (6) through a pump (5) so as to be discharged. During the discharging, the subsidence area is backfilled by a discharging mode of plane partitioning staggering and vertical cement and non-cement interbedding; according to the plane partitioning staggering discharging, the subsidence area is divided into a plurality of independent discharging areas on a plane according to a spatial distribution state of the subsidence area, and the mixed slurry is discharged in the staggered manner according to different areas; and according to the vertical cement and non-cement interbedding discharging, cement backfill layers (7) and non-cement backfill layers (8) discharge the slurry in the staggered interbedding manner in the vertical direction of the subsidence area. The backfill method has the characteristics of low backfill cost, safety and reliability in backfill and the like.

Description

technical field [0001] The invention relates to a method for backfilling and disposing of subsidence areas of mining activities, which is mainly used for safe, environmentally friendly and efficient disposal of subsidence areas of mining activities, and belongs to the field of mining and geological disaster management. Background technique [0002] According to statistics, since the founding of the People's Republic of China, there have been 10,689 geological disasters caused by mine development in my country, and about 4,779 people died. Among them, there were 8320 ground subsidences and 535 deaths. Judging from the occurrence frequency (77.83%) and the number of deaths (11.2%) in the subsidence area, the surface subsidence in the mining area is the most serious mine geological disaster. [0003] At present, the usual way to deal with the subsidence area of ​​the mine surface is to use mine waste (coal gangue, fly ash, waste rock, etc.) to directly backfill the subsidence ...

AI Technical Summary

Problems solved by technology

The above method can play a certain role in the subsidence area that is inactive (that is, there is no mining at the bottom of the subsidence area), but there are many problems in the subsidence area that is active (that is, mining is still going on at the bottom of the subsidence area): using mine waste Directly backfilling the subsidence area will easily cause secondary disasters such as large-scale subsidence of the backfill body, underground debris flow, and groundwater pollution; the method of backfilling the subsidence area by blasting and collapsing mountains has the disadvantages of small scope of application, complicated blasting construction, and uncontrollable blasting backfill block degree. Vibration, flying rocks cause casualties and other shortcomings; using tailings filter cake to dispose of subsidence has problems such as inflexible discharge methods, high backfill costs, and high accident rates for operators and equipment; transforming active subsidence areas into tailings ponds will inevitably lead to tailings slurry Injected into the underground working face and stope, even causing well flooding accidents, etc.

Therefore, the traditional methods for dealing with inactive subsidence areas are not suitable for the disposal of active subsidence areas

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