隧道数字化火灾预警系统的在线量化评估

为检查和评价隧道及地下空间火灾预警系统的实际功能,需要一套可行的在线评估手段。根据近年来国内外全尺寸隧道火灾发展曲线的试验结果,提出隧道火情的定义依据;引用运营隧道内准分布式光纤光栅感温火灾探测器的实测数据,证明运营中隧道报警系统的个性化现象;提出合格的数字化报警系统应存在一个在统计学意义上使漏报率和误报率同时达到期望值的合理阈值取值区间;建议以该区间的尺度作为该系统功能完好性的评估指标;对日常隧道运行温度数据的统计分析可估计合理阈值取值区间的下限,对规定条件下的现场点火试验温度数据分析可估计合理阈值取值区间的上限。在隧道运营期该区间尺度可实时在线自动更新。

On Line Characterization of Digital Fire Alarm Systems for Road Tunnels

A suit of feasible online evaluation system is needed for check the actual function of fire alarm system of tunnel and underground space. The definition accordance of tunnel fire disaster is put forward based on experimental data of full-scale tunnel fire developing curves in China and abroad; the personalized phenomenon of operational tunnel alarm system is proved by measuring data by quasi-distributed fiber Bragg grating heat fire detector in tunnel; a rational threshold value range that meets the requirement of failed and false alarm rates is proposed for digital alarm system, and the range should be regarded as the evaluation index for the functional integrity of the system; the superior limit of the range can be determined by statistically analyzing the daily tunnel operational temperature data, and the lower limit can be determined by analyzing the fire temperature data under special conditions. The range can be updated in real-time.