According to the burial conditions of the deposit and the parameters of the open space, the layout of the vehicle transportation development pit line (ie, the entrance and exit trench) is divided into return type, spiral type and joint type. In addition, there are open pit underground slopes.
(1) Return to the pit line
The return-type pit line development is shown in Figure 1. When the car is running on the pit line, it needs to change the running direction through the return curve of a certain radius of curvature to reach the corresponding working level.
Figure 1 returning pit line development
(2) spiral pit line development
The spiral pit line development is to arrange the transport channel along the periphery of the open pit mine (Figure 2). The car is straight on the pit line, and there is no need to change the running speed frequently. The turning radius of the spiral pit line is large, the driver's field of vision is good, and the line passing ability is large.
Figure 2 spiral pit line development
(3) Joint pit line development
The upper part of the stope is developed with the return pit line. As the mining depth decreases, the plane size of the stope decreases. When the car cannot return to operation, the spiral pit line is used to develop (Fig. 3).
Figure 3 return pit line and spiral pit line joint arrangement
(4) Underground slope development
As shown in Figure 4, the underground slope development method is set up. Under the open-pit mining boundary, underground slopes are set up, and there are entrances and exits at the corresponding elevations leading to various mining levels. The vehicles are transported from the mine through the entrances and exits and ramps to the surface.
Figure 4 underground slope development
a — spiral slope development; b — return slope development
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