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矿山井巷断面积一般是由产量决定的。具体地说,一类是产量决定运输设备,再由运输设备决定巷道断面;另一类是由产量决定风量,再由风量确定井巷断面。这后一类就是专用通风井巷。过去设计通风井巷是从满足允许的最大风速要求出发,设计结果是工程量最小,初期投资最小;但风速大,经营费用高。后来又提出了按年费用最小原则设计,即所谓通风经济断面设计。设计结果是,井巷断面积较前一种设计方法的大,初期投资大,风速低,经营费用小,年费用最小。
Mine shaft lane area is generally determined by the output. Specifically, the first category is the output of transport equipment, transportation equipment and then decided by the tunnel section; the other is determined by the volume of wind production, and then by the wind to determine the well section. This latter category is dedicated ventilation shaft. In the past, ventilation shafts were designed to meet the maximum allowable wind speed requirements. The design result was that the project volume was the smallest and the initial investment was the smallest. However, the wind speed was high and the operating cost was high. Later proposed a minimum annual cost of design, the so-called ventilation economy section design. As a result of the design, the broken area of the roadway is larger than that of the former design method, and the initial investment is large, the wind speed is low, the operating cost is small, and the annual cost is the minimum.