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4.6 通风参数与环境状况的相关规律 通过对大风量现场测试数据的收集、整理、分析和研究,可以找到在特定的机械化施工条件下,通风参数与环境状况之间的相关规律,现归纳如下: （1）对作业机械在洞外离排气管出口 2～3m处进行尾气测试,结果装碴机和运碴车的废气排放量最大（见表2、表3）,是作业循环中出碴工班污染最重的主要因素,提示机械进洞作业时应加空气净化装置。
4.6 Relevant laws of ventilation parameters and environmental conditions Through the collection, sorting, analysis and research on the field test data of gales, we can find out the relevant rules between ventilation parameters and environmental conditions under certain mechanized construction conditions, which are summarized as follows: (1) Exhaust gas test was carried out on the working machinery at a distance of 2 ~ 3m away from the outlet of the exhaust pipe. As a result, the exhaust emissions of the ballast loading machine and the ballasting car were the largest (Table 2 and Table 3) Job class the most important factor in the pollution, suggesting that the operation of mechanical holes should be added air purification device.