在矿井通风风量测定中须知道巷道断面积S。我矿绝大部分巷道为1/3拱高的圆弧拱,如附图所示,其断面积S=B(H+0.24B)故需量出墙高 H,还要乘上0.24,计算不便;而且由于拱与墙分界也不明显,墙高不大好量。所以我们采用了简便方法,即在离巷道一帮距离为0.2B 处量出平均高 h,再乘上巷道宽度,得断面积。证明如下: In the mine ventilation air flow measurement to know the cross-sectional area S. I mine most of the roadway is 1/3 arch arc arch, as shown in the figure, the cross-sectional area S = B (H + 0.24B) so the amount required wall height H, but also multiplied by 0.24, calculated Inconvenience; and because of the boundary between the arch and the wall is not obvious, the wall is not good. Therefore, we adopted a simple method, that is, a distance from the roadway a bunch of 0.2B at the average high h, multiplied by the width of the roadway, get broken area. Prove as follows: