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The mining work of the shallow hole retention method mainly includes: stage transportation and alley, ventilation pedestrian patio, contact road, etc.
( 1 ) Stage transportation lane
[Note] Some transportation lanes belong to development, and some are used when they are used. The typical operation of the operation, it is not certain whether it is excavated at the time of development or on time. The complete ore block can not be lack of stage transportation lanes, so the stage can be transported into the roadway.
The main factors affecting the location of the transport lane are:
1 the nature of the veins and the two plates of rock;
2 the thickness of the veins and the industrial value of the ore;
3 mineralization of surrounding rock;
4 Ways of support for the roadway; the period of use and the amount of ore transported in the roadway.
When mining thin veins, the veins are generally located in the center of the roadway. This is conducive to prospecting and is not easy to lose the veins, so it is used more in production.
When the flat road is biased to the lower part of the vein, it is more convenient to open the patio and arrange the mining funnel.
If the disk has a rock footwall mineralization, drift should be biased towards a side mineralization, so as to be the way metal ore recovery section.
When using the pulse-out arrangement, the roadway should be placed on the lower side of the vein as much as possible, which is beneficial to release the ore in the stope and reduce the flat-field workload of the lower part.
In short, when the ore body is relatively deep, the stage transport roadway is generally arranged in the ore body and close to the contact line of the lower plate; when mining the medium or thick ore body, the transport roadway can be digged into the lower plate rock. The use of extra-pulse mining time makes the transportation lanes relatively flat, which is conducive to transportation work. Especially when the transportation is busy, it shows its superiority and so on.
( 2 ) Ventilation pedestrian patio
1) The location of the patio - the patio is mostly placed in the column, the purpose is to create conditions for the back and forth mining columns, and some depending on the specific situation, the patio is placed in the rock, or one is in the center of the mine, the other is placed in In the surrounding rock on the side of the mine.
The patio can be placed in the middle of the vein or on the lower disc side (intrapulse). This mainly depends on the width of the vein and the arrangement of the lanes in the entire block. The patio Gongchangling iron ore Shrinkage Method is disposed intermediate between the veins in the column, namely:
as the picture shows:
2) For smaller thickness ore bodies, the patio can be divided into an advanced patio and a patio.
1Advanced Patio - refers to the patio that is excavated in the rock before the mining block is harvested;
2 Bypass Patio - refers to the patio that is erected with the cross bracing in the stope;
Advanced patios are usually available in two configurations, one with a central advanced patio and the other with an advanced side patio.
Advantages and Disadvantages of Digging Central Advanced Patio and Applicable Conditions:
[Advantages] 1 Cutting the central advanced patio can improve ventilation conditions;
2 It is convenient to use the central advanced patio as the free surface, and it is convenient to dig into the forming working surface on both sides, and no special grooving is required.
3 Conducive to the transport of materials and equipment, but also added a safe exit.
[Disadvantages] It is difficult to manage the roof at the central advanced patio opening
[Applicable conditions] When the length of the mine is relatively large, more than 50 meters, in order to improve the ventilation conditions of the stope and ensure safe working conditions, the patio is often opened in the center of the mine.
Advantages of setting up a parallel patio:
[Advantages] 1 Increased safety exits;
2 Improved working surface ventilation conditions;
3 shortened the preparation and end of working hours;
[Applicable conditions] When mining thin veins, set up a smooth patio.
Dig into the patio on one side of the nugget and the shallow hole to retain the ore on the other side . Do not leave a column, only the top column. In the middle of the mine, the tunnel is digging into the courtyard, and the shallow hole retaining method of the paved patio is provided on both sides .
( 3 ) Pedestrian ventilation corridor
In the vertical direction, on both sides of the pedestrian patio, a contact road is opened every 4-5 meters to make the patio and the mine. The cross section of the contact road can be 1.8 x 1.5 meters, or 1.8 x 1.8 meters.
[Note] Whether the pedestrian ventilation links on both sides of the mine should be staggered:
The key issue is not a staggered or a good opening problem. The key issue is how to ensure that there are two safety exits in the mine. As long as there are always two safe exits, it is good to open.
Some of the stopholes in the shallow hole retention method of Gongchangling Iron Mine are staggered, and some are not staggered.
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