A plug for a void in a mine to divert water having a rigid closed cell foam which fills the void. The rigid closed cell foam having a plurality of tremie pipes disposed within the foam. The tremie pipes distributed throughout the void. The tremie pipes are positioned in the foam so the pipes are staggered in length vertically with respect to various heights in the void, and the tremie pipes are positioned in the foam every 4 to 6 horizontally with respect to the void. Each tremie pipe has a mixing stick. A method for diverting water from a void in a mine.

A method for dynamic water feeding and hole sealing using high water-absorbent resin is applicable to sealing of a borehole on which extraction has a great impact. Two ends of a hole-sealed section of the borehole are sealed. Fine mixed high water-absorbent resin powder wrapped in a piece of cotton cloth is disposed in the hole-sealed section of the borehole, a water injection pipe and a gas extraction pipe are inserted in the borehole, and an automatic feed water valve is used to inject water into the hole-sealed section. The fine mixed high water-absorbent resin powder that fills the hole-sealed section and surrounding cracks with the water flow rapidly swells up after soaking up water to fill the hole-sealed section, and maintains at a swelling pressure. After the powder swells up and hole sealing is completed, the extraction pipe is connected to an extraction apparatus to perform gas extraction. This method has advantages such as tight hole sealing, high automation degree, and dynamic hole sealing, thus effectively solving problems that pores around the borehole are poorly sealed, it is difficult to seal cracks newly produced by extraction and so on. Moreover, the powder for hole sealing is low in price, and therefore the hole sealing cost is low.

A method for dynamic water feeding and hole sealing using high water-absorbent resin is applicable to sealing of a borehole on which extraction has a great impact. Two ends of a hole-sealed section of the borehole are sealed. Fine mixed high water-absorbent resin powder wrapped in a piece of cotton cloth is disposed in the hole-sealed section of the borehole, a water injection pipe and a gas extraction pipe are inserted in the borehole, and an automatic feed water valve is used to inject water into the hole-sealed section. The fine mixed high water-absorbent resin powder that fills the hole-sealed section and surrounding cracks with the water flow rapidly swells up after soaking up water to fill the hole-sealed section, and maintains at a swelling pressure. After the powder swells up and hole sealing is completed, the extraction pipe is connected to an extraction apparatus to perform gas extraction. This method has advantages such as tight hole sealing, high automation degree, and dynamic hole sealing, thus effectively solving problems that pores around the borehole are poorly sealed, it is difficult to seal cracks newly produced by extraction and so on. Moreover, the powder for hole sealing is low in price, and therefore the hole sealing cost is low.

A method for underground mining in a rock body include drilling one or more service boreholes from at least one surface location into a subsurface rock body. A plurality of multilateral blast holes is drilled, branching from at least one of the one or more service boreholes into the subsurface rock body. The plurality of multilateral blast holes are each loaded with one or more explosive charges and one or more detonators. The one or more explosive charges and the one or more detonators are inserted from surface. The one or more explosive charges is detonated wirelessly to fragment the subsurface ore body. Fragmented rock is extracted via the one or more service boreholes, to surface.

A method for underground mining in a rock body include drilling one or more service boreholes from at least one surface location into a subsurface rock body. A plurality of multilateral blast holes is drilled, branching from at least one of the one or more service boreholes into the subsurface rock body. The plurality of multilateral blast holes are each loaded with one or more explosive charges and one or more detonators. The one or more explosive charges and the one or more detonators are inserted from surface. The one or more explosive charges is detonated wirelessly to fragment the subsurface ore body. Fragmented rock is extracted via the one or more service boreholes, to surface.

The present invention discloses a multi-energy complementary system for a co-associated abandoned mine and a use method. The multi-energy complementary system for a co-associated abandoned mine includes a mining mechanism, a grouting mechanism and an energy mechanism. In the present invention, the mining of coal and uranium resources is realized through the mining mechanism, the subsidence and seepage reduction of the stratum is realized through the grouting mechanism, and the effective utilization of waste resources is realized through the energy mechanism. Finally, with the efficient cooperation of the three mechanisms, safe and efficient development and utilization of co-associated resources in the full life cycle are realized, and the purposes of green and efficient mining of coal and uranium resources and secondary development of a coal seam goaf are achieved, thereby facilitating the realization of dual-carbon goals and the development of low-carbon green energy.

The present invention discloses a multi-energy complementary system for a co-associated abandoned mine and a use method. The multi-energy complementary system for a co-associated abandoned mine includes a mining mechanism, a grouting mechanism and an energy mechanism. In the present invention, the mining of coal and uranium resources is realized through the mining mechanism, the subsidence and seepage reduction of the stratum is realized through the grouting mechanism, and the effective utilization of waste resources is realized through the energy mechanism. Finally, with the efficient cooperation of the three mechanisms, safe and efficient development and utilization of co-associated resources in the full life cycle are realized, and the purposes of green and efficient mining of coal and uranium resources and secondary development of a coal seam goaf are achieved, thereby facilitating the realization of dual-carbon goals and the development of low-carbon green energy.

An isolated overburden grouting filling method for coal gangue underground emission reduction includes determining a grouting filling key stratum according to information of a coal face; constructing a directional borehole from an underground tunnel to the inside of the grouting filling key stratum; constructing a plurality of branch holes downward in a main hole of the directional borehole; and by establishing a grouting filling system under a mine, gangue obtained from excavation gangue of the mine and gangue sorting being made into a filling slurry by means of breaking and grinding, and the filling slurry filling fractures below the key stratum through the directional borehole. The gangue generated from a mine is directly made into a filling slurry under the mine and then fills overburden mining-induced fractures, thereby achieving harmless disposal of the gangue, effectively supporting a key stratum, and controlling stratum movement and surface subsidence.

A system for forming a cavity in a backfill mixture comprising granular material and water positioned in an at least partially excavated stope. The system includes a base and a drainage tube assembly in an extended condition thereof. The drainage tube assembly extends between a lower end secured to the base and an upper end positioned above an upper surface of the backfill mixture. The extended drainage tube assembly includes a tube portion thereof with a permeable material and defining the cavity therein into which the water from the backfill mixture is drainable, through the permeable material. The system also includes a drainage pipe, for permitting the water that has drained into the cavity of the extended drainage tube assembly to exit the stope.

A system for forming a cavity in a backfill mixture comprising granular material and water positioned in an at least partially excavated stope. The system includes a base and a drainage tube assembly in an extended condition thereof. The drainage tube assembly extends between a lower end secured to the base and an upper end positioned above an upper surface of the backfill mixture. The extended drainage tube assembly includes a tube portion thereof with a permeable material and defining the cavity therein into which the water from the backfill mixture is drainable, through the permeable material. The system also includes a drainage pipe, for permitting the water that has drained into the cavity of the extended drainage tube assembly to exit the stope.