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Sublevel column caving method
1) The role of the sectional transport link
It is used to connect the roadways and chutes, ventilation patios and equipment wells. To form a complete delivery system, its main role is to transport, and thus called the transport link.
2) Section size of the transport link
Basically the same as the mining approach, because the equipment has to travel the same way, when the transport corridor is placed in the vein, in fact, part of it is a mining lane.
3) Arrangement of transport corridors
It can be divided into two types: intrapulmonary and extrapulmonary.
1 pulse arrangement
Advantages: (a) can obtain ore produced; (b) reduce rock excavation; (c) improve the stability of the contact when the surrounding rock is unstable and the ore is stable; (d) cloth in the vein, contact It can double as a mining roadway, which can reduce the amount of mining work.
Disadvantages: (a) When the ore body is irregular, it often affects the upper and lower sections in a strictly diamond-shaped arrangement; (b) when the contact road is placed in the vein, it is often the last to recover this roadway, which is subject to high pressure. It is easy to be crushed, so sometimes it has to collapse multiple rows at a time, causing a large loss of ore. (That is, the normal collapse of the mine is not falling, the frontal loss is large, and the safety is not good. The intersection of the mining contact road and the approach intersection has to increase the step of the collapse, once 4 to 5 rows, also causing the loss. Increase; (c) poor ventilation (the contact road becomes a single lane).
2 pulse arrangement
Judging from the shortcomings of the arrangement inside the pulse, the segmental contact channel is still arranged outside the pulse. Although the amount of rock excavation is increased, other conditions are better. However, when the thickness of the ore body is large and the type of ETQ-14 is selected, it is limited by the effective transportation distance of the equipment. At this point, the transport link had to be placed in the vein.
4) Requirements for the turning radius of the sectional transport link - In order to make the turn smooth, the turning radius R is required to be > 6.5 ~ 8 meters. (refers to ZYQ-14 type) If the scraper R is used, it should be returned.
There should be certain restrictions on the angle of intersection between the section transport corridor and the mining lane. Generally α≤90°, the purpose is to operate conveniently.