一、前言 在井下进行掘进的矿山中,除水平巷道外,如立井、斜井等其地下构筑物很复杂,在很多地方设置了坑木等可燃物,并且进行强制通风或自然通风,所以,在很大范围内存在火灾易于扩大的潜在危险,特别是斜井,进行上向通风时,火灾蔓延速度很快,下向通风时,由于火灾与气流相互作用而出现不稳定的燃烧特性。这种倾斜巷道特有的火灾性状是由实验而明确的,获得各种巷道条件下的火灾蔓延特性值或因火灾通风变化等定量性数据,目的是为了建立防火、防火灾蔓延措施。笔者首先报告了水平巷道的火灾蔓延度特性的研究(以下将该报告称之为前报),所以,本报告中阐 I. Introduction In mines for underground excavation, in addition to horizontal tunnels, underground structures such as vertical shafts and inclined shafts are complex and many places are equipped with combustibles such as pits and are forcibly or naturally ventilated. Therefore, In a wide range, there is a potential danger of fire being easily enlarged. Especially for inclined shafts, when the ascending ventilation is carried out, the fire spreads rapidly and when the ventilation is downward, unstable combustion characteristics occur due to the interaction between the fire and the air flow. The unique fire characteristics of this inclined roadway are experimentally clear and obtain quantitative values ​​of fire spread values ​​under various roadway conditions or due to changes in fire ventilation in order to establish measures for preventing fires and fires from spreading. The author first reported the study of the characteristics of the degree of fire spread in horizontal roadways (this report will be called the first report below). Therefore, in this report