摘要:
An inclined layered solid-filling mining method in an ultrathick coal layer is applicable to exploitation in a “three-unders” ultrathick coal layer. In this method, the number of inclined layers is determined based on a principle of layered thickness from 2.5 m to 4.5 m, and a layered-exploitation downward-filling exploitation order is adopted. Tunnels and equipment are arranged according to a conventional solid-filling mining method. A cyclic order of mining, layout of metal meshes (14) and bamboo fences (24), and filling is adopted, so as to accomplish filling and exploitation of a first mining face and a first layer (21). Meanwhile, 4 months after the working face of this layer is finished, at a corresponding position in a second layer (22), under the cover of an artificial ceiling formed by the first layer (21), exploitation is performed by using the same filling mining method; such a cycle is repeated, and exploitation in a current layer is performed under the cover of an artificial ceiling fabricated by an upper layer, until the entire ultrathick coal layer is finished. When this method is adopted to exploit “three-unders” ultrathick coal layer resources, strata movement and earth surface subsidence may be effectively controlled; the method has a high extraction rate, high production efficiency, and low cost.
摘要:
A shaft plug (11) for a mine shaft (10), the shaft plug (11) comprising an inflatable bladder adapted to be inflated by pressurised gas, the bladder being adapted to be positioned within a shaft (10) prior to inflation and to be inflated to contact the walls of the shaft (10) to thereby seal the shaft (10) and provide support to the shaft wall. A plurality of shaft plugs (11) are adapted to by linked together in a manner to provide gas communication between the shaft plugs (11) to provide a plug string (41) to enable the shaft to be substantially filled by the plug string (41) when inflated. Also defined is a method of sealing a mine shaft and supporting the shaft wall by use of a shaft plug (11) or plug string (41) described within.
摘要:
A method of installing a fill fence system at a predetermined location to at least partially cover an opening defined by a back, a floor, and side walls. The method includes providing a carrier system including a carrier assembly, locating the carrier assembly in a safe zone adjacent to the unsafe zone, and positioning an assembled fill fence assembly on the carrier assembly. The carrier assembly and the full fence assembly are moved to a preselected location. With the carrier assembly at the preselected location, the fill fence assembly is positioned at the predetermined location, and installed at least partially to cover the opening. The carrier assembly is disengaged from the fill fence assembly and removed from the preselected location. The fill fence system includes a securing element is applied to help secure the fill fence assembly in the opening.
摘要:
A method of stowing a goaf of potash salt ore comprising making wall slurry into barricades each have the same area as the sectional area of a tunnel and a thickness of 0.5 to 5 meters inside the underground tunnels in goaf of potash salt ore, with the interval between adjacent barricades being 5 to 100 meters, then stowing the interval between the barricades by using the filling slurry is described. The stowing method uses the wall slurry of high strength that is solidified with a gelling agent as the main bearing material, and uses the solidified filling slurry with a low strength as the main filling material, which has a good effect when compared with conventional filling materials. Moreover, the stowing method effectively utilizes the tail liquids, thereby reducing the addition of other additives, decreasing the cost, avoiding the discharge of liquid waste and relieving the environmental pressure.
摘要:
A shaft plug for a mine shaft, the shaft plug comprising an inflatable bladder adapted to be inflated by pressurised gas, the bladder being adapted to be positioned within a shaft prior to inflation and to be inflated to contact the walls of the shaft to thereby seal the shaft and provide support to the shaft wall. A plurality of shaft plugs are adapted to by linked together in a manner to provide gas communication between the shaft plugs to provide a shaft plug to enable the shaft to be substantially filled by the shaft plug when inflated. Also defined is a method of sealing a mine shaft and supporting the shaft wall by use of a shaft plug.
摘要:
Equipment for retaining flowable material within a packhole has two connected sections defining two boundaries of the packhole. The sections comprise a base and a roof engaging assembly for engaging the mine roof. Each section has a flexible sheet connected to the base and roof assembly.
摘要:
A method for removing a hydraulic support for solid filling coal mining includes digging a support removing channel (3) in a coal body (2) in front of the hydraulic support (1), and laying a support removing track (4), then removing the hydraulic support from a coal conveying gateway (11) to a track gateway (5), temporary supporting is carried out by matching a single supporting column with a n-type steel beam before each hydraulic support is removed. A supporting roof is reinforced in time by means of erecting a crib (13) and grouting after each hydraulic support is removed, three grouting pipelines (12) are laid after the supports of the whole work surface are removed, and grouting is carried out in the whole finishing cut space. The roof of the support removing space of the work surface is stable so that the hydraulic supports on the work surface of solid filling coal mining are ensured to be safely and efficiently removed.
摘要:
A method of installing a fill fence system at a predetermined location to at least partially cover an opening defined by a back, a floor, and side walls. The method includes providing a carrier system including a carrier assembly, locating the carrier assembly in a safe zone adjacent to the unsafe zone, and positioning an assembled fill fence assembly on the carrier assembly. The carrier assembly and the full fence assembly are moved to a preselected location. With the carrier assembly at the preselected location, the fill fence assembly is positioned at the predetermined location, and installed at least partially to cover the opening. The carrier assembly is disengaged from the fill fence assembly and removed from the preselected location. The fill fence system includes a securing element is applied to help secure the fill fence assembly in the opening.
摘要:
This invention is directed to an electrically non-conductive tie for use in a mine seal having opposing walls defining a space for receiving filler material. The tie has opposite ends, a length and a width and is made at least in part from an electrically non-conductive material which extends across substantially the entire width of the tie for preventing conduction of electrical current from one end of the tie to the other. Openings are provided adjacent opposite ends of the tie for receiving wall supports for the mine seal.