A continuous mining and delayed filling mining method for a deep ore body masonry structure is provided, comprising: dividing an ore body into ore blocks along a trend, internally dividing each ore block into stopes with square masonry structures, and reserving a rib pillar between the ore blocks; arranging an ore block conveyor belt gallery and a stope conveyor belt gallery at the lower parts of the ore blocks, arranging ore block crossheading and stope crossheading at the upper parts of the ore blocks, mining the stopes in the sequence from the foot wall to the hanging wall. In accordance with the present disclosure, adverse effects caused by deep high geo-stress and high geo-temperature on mining operation can be effectively overcome. The method has the advantages of low carbon and environmental protection, safety of recovery operation, high mechanization of stope operation, low labor intensity of manual operation and the like.

The present invention discloses a mine exploitation method based on stoping, separation and filling control. The design process comprises: deploying a gangue-less coal mining system; choosing a suitable coal and gangue separation method according to a separation requirement; choosing a suitable filling method according to mine geology, production conditions and rock stratum control requirement; reversely calculating a filling rate according to gangue discharge requirement and control indexes by utilizing theoretical calculation, simulation and experiment; determining a filling process and a separation process according to the filling rate; and feeding back and adjusting the filling process and separation process parameters by monitoring filling and control effect indexes. The design method is highly integrated with underground coal and gangue separation, gangue filling and coal stoping processes, design is performed aimed at different control requirements of controlled objects under different engineering backgrounds, the design method can be used for guiding the design of underground mining based on stoping, separation and filling control of a mine, the zero discharge of coal gangue on the ground can be realized, ground subsidence, rock burst and aquifer stability can be controlled, and therefore the design method has a good popularization prospect.

The present invention discloses a mine exploitation method based on stoping, separation and filling control. The design process comprises: deploying a gangue-less coal mining system; choosing a suitable coal and gangue separation method according to a separation requirement; choosing a suitable filling method according to mine geology, production conditions and rock stratum control requirement; reversely calculating a filling rate according to gangue discharge requirement and control indexes by utilizing theoretical calculation, simulation and experiment; determining a filling process and a separation process according to the filling rate; and feeding back and adjusting the filling process and separation process parameters by monitoring filling and control effect indexes. The design method is highly integrated with underground coal and gangue separation, gangue filling and coal stoping processes, design is performed aimed at different control requirements of controlled objects under different engineering backgrounds, the design method can be used for guiding the design of underground mining based on stoping, separation and filling control of a mine, the zero discharge of coal gangue on the ground can be realized, ground subsidence, rock burst and aquifer stability can be controlled, and therefore the design method has a good popularization prospect.

A method for mining an ultra-thick coal seam by utilizing a goaf solid backfilling technique is suitable for mining an ultra-thick coal seam having a thickness of 25 m-45 m. According to the method, the ultra-thick coal seam is sliced into three slices, i.e. an upper slice, a middle slice and a lower slice. First, the middle slice is subjected to solid backfilling and mining. Metal meshes are paved along a working face of the floor. The backfilling layer serves as an artificial floor for mining the upper slice and an artificial roof for mining the lower slice. Then, the upper slice is mined by the top coal caving mining based on the artificial floor formed by backfilling the goaf of the middle slice. Finally, the lower slice is mined by the top coal caving mining along the coal seam floor with the shield of the artificial roof.

A method for mining an ultra-thick coal seam by utilizing a goaf solid backfilling technique is suitable for mining an ultra-thick coal seam having a thickness of 25 m-45 m. According to the method, the ultra-thick coal seam is sliced into three slices, i.e. an upper slice, a middle slice and a lower slice. First, the middle slice is subjected to solid backfilling and mining. Metal meshes are paved along a working face of the floor. The backfilling layer serves as an artificial floor for mining the upper slice and an artificial roof for mining the lower slice. Then, the upper slice is mined by the top coal caving mining based on the artificial floor formed by backfilling the goaf of the middle slice. Finally, the lower slice is mined by the top coal caving mining along the coal seam floor with the shield of the artificial roof.

An internally injected replacement support room-type coal pillar recovery method is provided. During the recovery the room-type coal pillars with an aspect ratio greater than 0.6 are divided into two parts: reserved coal pillars and pre-mined coal pillars. After the mining of the pre-mined coal pillars, a cemented filling material is injected into a goaf surrounded by the reserved coal pillars, and is stabilized to replace the coal pillars for support, and the reserved coal pillars are recovered. A mechanical model of the reserved coal pillars in a support overburden stage is established based on the Winkler beam theory, to obtain displacement and stress conditions of a roof of the reserved coal pillar in a support stage. A theoretical reserve-width of the reserved coal pillars is obtained according to a first strength theory of the roof and a criterion of ultimate strength of the reserved coal pillars.

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 pipes disposed within the foam. The pipes distributed throughout the void. The pipes are positioned in the foam so the pipes are staggered in length vertically with respect to various heights in the void, and the pipes are positioned in the foam every 4 to 6 horizontally with respect to the void. Each pipe has a mixing stick. A method for diverting water from a void in a mine.

A method for controlling a subsidence area caused by underground mining in an adjoining open-pit mine, applied in an open-pit and underground coordinated mining process. In the method, a ground subsidence area caused by underground mining and production is directly filled and covered with overburden materials such as soil and rock discharged from an adjoining open-pit mine; small and medium fracture zones and large fracture zones caused by mining are timely backfilled, tamped, and levelled according to areas before the ground subsidence area appears, the thickness of the levelled soil layer is kept above 1 m, and the area slope is controlled within 7. By fully using overburden materials from an adjoining open-pit mine, the method controls a subsidence area caused by underground mining and greatly shortens the discharge distance of the overburden materials from the adjoining open-pit mine, also solves the safety problems such as air leakage and spontaneous combustion of coal caused by fractures in mine subsidence, and brings significant economic and social benefits.

A method for controlling a subsidence area caused by underground mining in an adjoining open-pit mine, applied in an open-pit and underground coordinated mining process. In the method, a ground subsidence area caused by underground mining and production is directly filled and covered with overburden materials such as soil and rock discharged from an adjoining open-pit mine; small and medium fracture zones and large fracture zones caused by mining are timely backfilled, tamped, and levelled according to areas before the ground subsidence area appears, the thickness of the levelled soil layer is kept above 1 m, and the area slope is controlled within 7. By fully using overburden materials from an adjoining open-pit mine, the method controls a subsidence area caused by underground mining and greatly shortens the discharge distance of the overburden materials from the adjoining open-pit mine, also solves the safety problems such as air leakage and spontaneous combustion of coal caused by fractures in mine subsidence, and brings significant economic and social benefits.

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.