What are the advantages and disadvantages of vertical shaft development compared with inclined shaft development?

The adaptability of vertical shaft development is strong, generally not subject to the natural conditions of the coal bed inclination, thickness, gas, hydrology, etc.; the vertical shaft is short, the lifting speed is fast, and the lifting capacity is large, which is especially advantageous as a sub-shaft; for the mines with very large wells, the large section shaft can be used, and equipped with two sets of lifting equipment; the large section can satisfy the requirements of the large air volume; due to the short shaft, the ventilation resistance is small, which is more advantageous for the deeper wells. Therefore, when the terrain and geological conditions of the well field are not favorable for the development of flat or inclined shafts, the development of vertical shafts can be considered. For coal seams buried deeper, thick topsoil layer, complex hydrological conditions, the need for special construction methods or mining near horizontal coal seams and multi-level mining sharp inclined coal seams mine, the general use of vertical shaft development.

Compared with vertical shafts, inclined wells have simpler shaft digging technology and construction equipment, faster digging speed, simpler shaft equipment and ground facilities, and simpler shaft yards and chambers, so the initial investment is less, and the construction period is shorter; in the case of multi-level mining, inclined wells have fewer stone gate projects, fewer transportation costs for stone gates, and inclined wells have convenient depth extensions, which cause less interference with production; and the application of large-capacity, powerful belt conveyors increases the superiority of inclined shafts over other coal mines. The application of large capacity powerful belt conveyor increases the superiority of inclined shaft and expands the application range of inclined shaft. The disadvantages are: when the natural conditions are the same, the shaft of inclined well is long, and it is difficult to maintain the shaft when the surrounding rocks are not stable; when winch is used for hoisting, the hoisting speed is low, the capacity is small, the wire rope is worn out seriously, the power consumption is large, and the cost of hoisting is high; the longer the slanting length of the well field is, the more sections are used for hoisting, and the transferring links are many, the system is complicated, and the occupied equipments and staffs are many; the length of the pipes and cables is large, and the loss of the security pillar is large; for the extra-large inclined well, the auxiliary transportation volume is very large. Inclined shaft, auxiliary transportation is very large, and even need to open a secondary inclined shaft; inclined shaft ventilation route is long, small section, ventilation resistance, such as can not meet the ventilation requirements, need to open another special wind well or also as an auxiliary lifting; when the topsoil for the alluvial or quicksand layer containing water, the inclined shaft construction technology is complex, and sometimes it is difficult to pass.

When the coal seams in the well field are not y buried, the topsoil layer is not thick, the hydrogeology is simple, and the shaft does not require special methods of construction of gently sloping and inclined coal seams, the inclined shafts can be used to open up in general. For the inclined wells which are lifted by string cars or skips, the lifting shall not exceed two sections. With the development of new powerful and large inclined angle belt conveyor, the mining depth of the large inclined shaft greatly increased, the inclined shaft is more widely used.