A mine stopping panel for installation between opposing first and second mine surfaces of a mine passage includes a panel member. The panel member has a channel shape and a web, side flanges at opposite sides of the web, an upper end, and a lower end. An end cap is attached to the panel member adjacent one of the upper and lower ends of the panel member in a position between the side flanges of the panel member adjacent an inside surface of the web of the panel member. The end cap defines a cavity for receiving an injectable foam material and an injection inlet for injecting said foam material into the first cavity. In a method of the invention and injectable foam material is injected into the cavity through the injection inlet during a process of sealing the mine passage.

The present disclosure provides an artificial dam of a distributed coal mine underground reservoir and its constructing method. The artificial dam comprises a support layer (10), an anti-seepage layer (20), and a concrete structure layer (30) that are successively formed in an auxiliary roadway (1) from inside to outside, the concrete structure layer (30) being embedded into a security coal pillar (2) and/or surrounding rock (3) around the auxiliary roadway (1). Because the concrete structure layer (30) is embedded into the security coal pillar (2) and/or the surrounding rock (3) around the auxiliary roadway (1), the artificial dam is combined to the security coal pillar (2) to together form a dam for an underground reservoir. Due to multi-layer design, anti-seepage performance and structural strength of the dam can meet the water storage requirements of the underground reservoir.

The present disclosure provides an artificial dam of a distributed coal mine underground reservoir and its constructing method. The artificial dam comprises a support layer (10), an anti-seepage layer (20), and a concrete structure layer (30) that are successively formed in an auxiliary roadway (1) from inside to outside, the concrete structure layer (30) being embedded into a security coal pillar (2) and/or surrounding rock (3) around the auxiliary roadway (1). Because the concrete structure layer (30) is embedded into the security coal pillar (2) and/or the surrounding rock (3) around the auxiliary roadway (1), the artificial dam is combined to the security coal pillar (2) to together form a dam for an underground reservoir. Due to multi-layer design, anti-seepage performance and structural strength of the dam can meet the water storage requirements of the underground reservoir.

A retainment wall for underground horizontally extending mine shafts wherein a spaced vertical series of horizontal support ribs are secured to one or more upright supports that are secured in the mine shaft between the side walls thereof. Porous material covers and is secured to the forward retaining face of the wall structure. If the retainment wall structure is to be used as a fill retainment barrier the porous material is spray coated with a settable sealant which covers the forward face of the wall structure and the perimeter thereof to seal off the mine shaft.

Disclosed is a graded plugging, monitoring and reinforcing integrated method for separation stratum grouting under single-side open conditions, falling within the technical field of coal mine filling and mining. The method specifically includes the following steps: analyzing the development law of a separation stratum, determining the scope of protective coal pillars for a surface building/structure, constructing a combined plugging dam, monitoring and evaluating the combined plugging dam, and implementing local reinforcement measures. The combined plugging dam proposed in the present disclosure can effectively prevent grout from flowing and migrating towards the remaining space of a target separation stratum above a mined area during grouting under single-side open conditions, enhancing the effectiveness of separation stratum grouting.

Disclosed is a graded plugging, monitoring and reinforcing integrated method for separation stratum grouting under single-side open conditions, falling within the technical field of coal mine filling and mining. The method specifically includes the following steps: analyzing the development law of a separation stratum, determining the scope of protective coal pillars for a surface building/structure, constructing a combined plugging dam, monitoring and evaluating the combined plugging dam, and implementing local reinforcement measures. The combined plugging dam proposed in the present disclosure can effectively prevent grout from flowing and migrating towards the remaining space of a target separation stratum above a mined area during grouting under single-side open conditions, enhancing the effectiveness of separation stratum grouting.

Disclosed is a graded plugging, monitoring and reinforcing integrated method for separation stratum grouting under single-side open conditions, falling within the technical field of coal mine filling and mining. The method specifically includes the following steps: analyzing the development law of a separation stratum, determining the scope of protective coal pillars for a surface building/structure, constructing a combined plugging dam, monitoring and evaluating the combined plugging dam, and implementing local reinforcement measures. The combined plugging dam proposed in the present disclosure can effectively prevent grout from flowing and migrating towards the remaining space of a target separation stratum above a mined area during grouting under single-side open conditions, enhancing the effectiveness of separation stratum grouting.

Disclosed is a graded plugging, monitoring and reinforcing integrated method for separation stratum grouting under single-side open conditions, falling within the technical field of coal mine filling and mining. The method specifically includes the following steps: analyzing the development law of a separation stratum, determining the scope of protective coal pillars for a surface building/structure, constructing a combined plugging dam, monitoring and evaluating the combined plugging dam, and implementing local reinforcement measures. The combined plugging dam proposed in the present disclosure can effectively prevent grout from flowing and migrating towards the remaining space of a target separation stratum above a mined area during grouting under single-side open conditions, enhancing the effectiveness of separation stratum grouting.

The present disclosure provides a graded underground pumped-storage hydropower system in a coal mine, and construction and methods of use. The system comprises a surface reservoir, wherein multi-stage stepped underground reservoirs are arranged below the surface reservoir, and there is no communication between the multi-stage stepped underground reservoirs. One side of the underground reservoir on each layer is provided with a hydraulic turbine room, and an upward water conveyance passageway and a downward water conveyance passageway are arranged between the hydraulic turbine room and each underground reservoir. Additional water conveyance passageways are arranged between the hydraulic turbine rooms among the layers. During use, the present disclosure can achieve multi-grade power generation and energy storage capabilities by controlling sluice gates, adjusting water flow directions as required.

The present disclosure provides a graded underground pumped-storage hydropower system in a coal mine, and construction and methods of use. The system comprises a surface reservoir, wherein multi-stage stepped underground reservoirs are arranged below the surface reservoir, and there is no communication between the multi-stage stepped underground reservoirs. One side of the underground reservoir on each layer is provided with a hydraulic turbine room, and an upward water conveyance passageway and a downward water conveyance passageway are arranged between the hydraulic turbine room and each underground reservoir. Additional water conveyance passageways are arranged between the hydraulic turbine rooms among the layers. During use, the present disclosure can achieve multi-grade power generation and energy storage capabilities by controlling sluice gates, adjusting water flow directions as required.