―, pulsed inclined well development method
When the ore body is not undulating along the slope , there is no wrinkles and faults, it is possible to use the intrapulmonary inclined well to develop. As shown in Figure 1 , the inclined well is mined along the floor of the ore body. Some of our small coal mines, pioneering the use of this method. Since the metal deposit generally vary widely, the pulse required to keep security inclined pillar, but also by rejection and lane restrictions, so the use of the metal ore vein little inclined to open up. It can be used as appropriate in the following cases .
(1) The ore body has a large range, the thickness is small, the rock in the lower plate is not stable, the ore is stable, and the value of the ore is not good ;
(2) mine shaft in urgent need of short-term operation, as soon as possible for the ore, the need for supplementary exploration wells;
(3) The open-pit mining will be converted to underground mining. The slope from the inclined wellhead to the surface of the ground can use the slope of the open-pit mine to connect the slope and the inclined shaft floor into a ramp.
Fig.1 Explosion method of intraductal inclined wellFig.2 Development method of inclined shaft in the lower part
1-pulse inclined well 2- along the vein roadway
Second, the lower inclined shaft development method
Figure 2 shows the method of developing the inclined shaft in the lower plate. Its stone door is much shorter than the stone door developed by the lower shaft . The inclination of the inclined well is generally the same as the inclination of the ore body. But in a few cases, it may also be pseudo-inclined inclined, such as a large mining, ore body is longer, but also using steel belt conveyor, can be tilted pseudo inclined, shown in Figure 3. At this angle of inclination γ with the relation between the solid ore standard wells Oblique angle β α and the inclination angle inclined to the horizontal line and the line of projection, as shown in FIG. 4, the following relationship is as follows:
Tg γ = sin β tg α :
The lifting method used in the inclined well depends mainly on the inclination of the inclined shaft :
When the inclination angle of the inclined shaft is ≥2 5 °~ 30° , it is generally lifted by a bucket or a trolley;
When the inclination angle of the inclined shaft is ≤ 25° ~ 30° , it is lifted by the train;
When the inclination angle of the inclined shaft is <18° , it can be transported by wire rope conveyor.
When the inclined shaft adopts the wire rope belt conveyor, the production capacity is large, the process system is simple, and the automation is easy .
Fig. 3 Schematic diagram of pseudo-slanted inclined well developmentFig . 4 Pseudo-inclined relationship diagram
A-vertical projection projection b-pseudo-tilt relationship diagram
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