However, in general there was no obvious damage to the surrounding rock of the roadway during the coal extraction period, the amount of deformation was small, and the transportation and ventilation requirements was fully able to be met.
Excavation of shafts and other vertical structures in mining and civil engineering fields for material and human transportation and ventilation purposes is a difficult job taking quite long time to realize.
These include a internal and external power supply network of buildings; lighting network of urban infrastructure; internal and external heat network; water supply and sewage networks; gas supply network; oil transportation network; engineering ventilation and air conditioning of buildings.
His criminal organization — the Sinaloa Cartel — has made a particular speciality of moving drugs across the border with the United States through long and sophisticated underground passages that include railed transportation, electricity and ventilation.
In addition to the means of transport used and the transport duration, the qualification of transportation personnel, technical equipment, ventilation parameters and the incidence of critical events were recorded.
A sufficient CO2 extraction and improvement in oxygenation enabled the safe transportation and lung protective ventilation.
However, ventilation and transportation are two main functions of retained entry, thus it is impractical to take a relatively small value of entry width.
For example, at position where coordinate is −136 m, the floor heave in No. 1 site unexpectedly reaches 1694.82 mm, This value is obvious not applicable for the normal ventilation and transportation of the entry in view of the original sizes of retained entry in Table 2.
P138 High-frequency percussive ventilation during neonatal transportation: a pilot study.
