1. Stage height - Generally, the working face is inclined to a length of 40 to 60 meters, and most of them are 30 meters. High phase depending plagioclase face, plagioclase, the smaller of Preparatory work, but mainly by the top face plagioclase slate stone stability, limiting power consumption of the effective consumption transport distance. In addition, pedestrians, transport materials and disassembly of Feng Shui ropes have also increased difficulties with the increase of the slant length. The height of the stages cannot be too large, but it should not be too small.
2. Length of the ore block——Because the longwall working face is continuously propelled, there is no strict requirement for the length of the nugget (long along the strike). Increasing the length of the nugget can reduce the amount of cutting the patio, but the number of nuggets is reduced. The longer the block, the fewer the number of nuggets produced at the same time, which will affect the production capacity of the stage. Therefore, the length of the nugget is generally based on the geological structure (large fault) and is determined by the number of nuggets mined at the same stage. The length of the nugget varies from 50 to 100 meters and the maximum is 200 to 300 meters. (such as the Wangcun clay mine's nuggets and industrial areas 225 to 300 meters long).
3. Stage transportation lane layout
It can be arranged in the rock in the mineral layer or in the bottom plate. When the bottom of the ore body is undulating, the geological damage such as faults is large, the ground pressure is large, and when the multi-layer ore body is mined at the same time, in order to ensure the straightness of the transportation roadway, and reduce the pair The maintenance workload of the roadway generally places the transportation roadway in the floor rock (outside the pulse). But the roadway can't leave the ore body too far (to ensure that the leak is not too high, but not too low, and can guarantee the installation of a train ore).
The mine excavates two monorail lanes at each stage to solve the problem of mine discharge and driving safety, and avoid pollution caused by series ventilation of the working face. A communication tunnel is used every 150 meters between the transportation lane and the loading lane. Each contact lane is 55 meters long.
The mine is arranged in the small quartz rock with good stability, which can serve the mining layer at the same time. At the same time, the ore slipper can also play a certain role in the storage of the mine. The contradiction of uncoordinated loading. At the same time, the ground pressure of the roadway is small and easy to maintain. (Shows the advantages of single track and double lane).
4, ore slipper
Every 5 to 6 meters along the loading lane, an ore slipper is drilled up and cut through the lower part of the stope. The section of the ore slipper is about 1.5×1.5m2, and the unused ore slipper can be used as temporary ventilation and pedestrian access.
5, safety road - every 10 meters or so to dig a safety road, and connected with the upper stage. It is the passage for the upper pedestrians to ventilate the material. Section = 1.5 × 1.8 m2. In order to ensure that the working surface is advanced to any position, there is a safety exit, and the distance between the safety roads is required to be not too large, and generally should not be greater than the maximum ceiling distance.
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