L-shaped fully-mechanized caving mining method and early-warning monitoring method for extremely-thick coal seam under slope of open-pit mine

Abstract

The invention discloses an L-shaped fully-mechanized caving mining method and early-warning monitoring method for an extremely-thick coal seam under a slope of an open-pit mine. The L-shaped fully-mechanized caving mining method and early-warning monitoring method comprises the following steps that a non-internal-discharging area is reserved in an open-pit mine pit, and the open-pit slope of the non-internal-discharging area is subjected to slope surrounding rock reinforcement; a working face cut hole and a transportation crossheading are sequentially tunneled along a bottom plate of the coalseam until reaching the boundary of the open-pit slope, and L-shaped longwall working face arrangement is formed; one end of the transportation crossheading communicates with a stoping working face, the other end of the transportation crossheading communicates with a mine ventilation system, and an internal top coal caving hydraulic support is arranged in the stoping working face; fully-mechanizedequipment is mounted in the stoping working face for stoping; an underground sound monitoring probe is mounted on slope surrounding rock; and a fixing platform is arranged in the non-internal-discharging area in an erected mode, and a three-dimensional laser scanner and a foundation synthetic aperture radar are mounted on the fixing platform. The coal mining method is high in adaptability, less in investment, quick in effect, large in output of working face, high in production efficiency, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of mining a huge-thick coal seam in an open-pit coal mine sidewall pressure coal area, in particular to an L-shaped fully mechanized caving mining method and an early warning and monitoring method for a sidewall huge-thick coal seam in an open-pit mine. Background technique [0002] my country's open-pit coal mines are rich in the amount of coal pressed in the side and thick coal seams. According to the statistics of 25 open-pit mines in my country, the amount of coal pressed in the side and side of the thick coal seam has reached 5.237 billion tons. Due to the lack of systematic research and mature technology, it has not been able to be recycled on a large scale. Cause huge waste of coal resources. At present, the commonly used coal mining methods for side-side coal mining in open-pit mines are: side-side coal mining machine mining, and traditional underground U-shaped layout mining. Among them, the end-sid...

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Problems solved by technology

Among them, the end-side coal mining machine is suitable for the mining of multiple coal seams and thin coal seams. This mining method has problems such as large size of coal pillars, small thickness of one-time mining, and low recovery efficiency, which cannot be adapted to the mining of huge thick coal seams under side walls; U-shaped layout mining has the problems of large amount of development engineering and complex production system, and the existence of isolated coal pillars causes unnecessary waste of coal resources

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