1) There are sufficient industrial sites to accommodate the relevant buildings (structures);
2) The distance between the selected plants is short and the ore is convenient to transport, or there are better external transportation conditions;
3) There is a waste rock site;
4) There are flood control conditions (generally 2m above the maximum flood peak) and are not affected by the collapse of mountain rocks;
5) There are good geological conditions, and try to avoid the main development of roadways through faults, aquifers and other unfavorable strata;
6) Minimize the amount of pioneering work.
In short, when selecting a reasonable position, it is impossible to analyze all the above-mentioned influencing factors, and the designer must grasp several main contradictions for analysis, and then obtain a reasonable position.
In Figure 7-23, the method of exploiting the deposit has been developed for the development of the lower shaft. According to the principle of minimum moving power in the underground, the position 1 is reasonable. There are good waste rock sites at 1 and 3, and there are ideal industrial sites. However, if the shaft is set to position 1, it must form two-wing ventilation. Ventilation wells need to be dug in both wings, so the amount of infrastructure construction is large, the construction period is long, and it is conducive to management. This will be the main contradiction in determining the position of the shaft. Finalization of the main shaft dug, dug in position 3 main air shaft, forming a corner ventilation, greatly reducing the amount of infrastructure projects and funding, shorten the cycle of infrastructure.
After considering this condition, the location of the main roadway is determined. In order to understand the condition of the rock formation that the wellbore will pass through, check whether it is beneficial to the wellbore and maintenance factors. Generally, it needs to play more than 10~15m and be deeper than the wellbore 3~5m. When the main roadway is an inclined shaft, it is necessary to drill holes that are not more than 50m apart and perpendicular to the wellbore. In mines with more complex lithology, the necessity of playing is obvious. For example, if an asbestos mine has not been drilled in advance, a thicker fracture zone is encountered during the excavation of the shaft. As a result, special methods have to be adopted. This not only delays the construction period, increases the cost of excavation, but also breaks through the budgetary estimate of infrastructure investment. .
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