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Mining layout and recovery sequence of downward stratified filling mining method
The layout of the approach depends on the filling method, the mining method and the roof maintenance method. The layout method should be flexible and easy to change. The way of the way of the way is: parallel or fan-shaped; the upper and lower layers are arranged in parallel or staggered; the slope of the approach is horizontal or inclined (50°~12°).
When a fixed filling roadway and a small well (or drilling) are used to fill the inclined inlet downward, the upper and lower stratified approaches are required or arranged correspondingly or according to the rules. The main advantage of this method is that the filling self-flowing top can be achieved. , such as the dragon head ore and copper ore BEIFANG. If the filling pipe is used to enter the way from the roadway for horizontal filling, the upper and lower layered paths are arranged in parallel or staggered. Staggered roof safety and stability are better than parallel arrangements, such as some mines in Japan's granite mines and Garpenberg in Sweden.
The route layout should ensure the best transportation distance and production capacity. Under the condition of maintaining the roof safety, it can recover 30~50% of the working face at the same time.
Generally, when the thickness of the ore body is below 15-20m, the approach along the ore body is arranged; when the thickness of the ore body is more than 20m, the approach can be determined according to the conditions of the rock, the principal stress direction, the magnitude of the ground pressure, and the mining method. The ore body is oriented or vertically oriented. The intersection of the approach road and the layered roadway is orthogonal (electrical discharge) and oblique (scraper discharge), and the angle of intersection is 120°.
Recovery order: In the same layer, the odd number (1, 3, 5...) approach is used for the first time, and the even number (2, 4, 6...) is the second time for the case, or one for every two. There is also a single-order recovery, after the 1st approach to recovery, after filling, and then take the No. 2 approach.
In the lower high-pass filling mining method, the odd-numbered approach is adopted for the first layer and the even-numbered approach is adopted for the second layer.