随着地下矿井开采技术的发展，无轨胶轮车在矿井的使用极大的改变了传统矿井的运输模式，不仅提高了工作进度，而且节约了人力并降低了劳动强度。但其排放的尾气严重威胁人体健康。论文对矿井内柴油机尾气排放特性的分布进行实验研究，分析尾气中可吸入颗粒物及有害气体在矿井不同风速和不同车速下的分布规律。研究结果可预测井下柴油机尾气在巷道中的分布规律，对保护人体健康，保障井下安全作业有一定意义。 参照陕西红石岩煤矿实际巷道尺寸，根据相似理论搭建了1:10的模拟巷道实验系统。通过对模拟巷道内不同风速和不同车速下的相似模拟，研究了在不同实验条件下柴油机尾气中可吸入颗粒物和CO、CO2及CH4气体的浓度分布，揭示了风速和车辆运行速度对尾气中的可吸入颗粒物和CO、CO2及CH4气体浓度在矿井巷道内分布的影响。 实验结果表明：尾气浓度中，CO2整体浓度是最大的，CH4的浓度在所测气体中的浓度是最小的。风速对柴油机尾气的浓度分布影响较大。在巷道同一测点处，可吸入颗粒物和CO、CO2及CH4的浓度随风速的增加而减小，但不呈线性关系，说明在矿井中，按照节能及控制污染物浓度的要求，风速应控制在适当的范围内。在巷道同一截面上，在风速作用下，由于高温导致了巷道上部气体浓度大，下部空间浓度小，使得气体浓度在巷道内上下分层现象比较明显。在巷道同一高度的走向上，由于气体密度的不同，导致风速和车速对各种气体的浓度分布规律差异较大。在巷道同一截面上，在车辆怠速时，由于扩散作用，靠近小车前端处可吸入颗粒物、CO和CO2浓度是最大的；在正常行驶时，相同测点处，可吸入颗粒物和CO2的浓度随车速增加而增大，CO和CH4浓度随车速增加而逐渐减小，且在车速为0.5m/s时CH4的浓度最小。车速为0.5m/s时的速度是中速行驶，即无轨胶轮车在实际矿井下中速行驶时柴油机尾气中的CH4浓度最小。

With the development of technology in underground mines, trackless rubber-tyred vehicle widely used in mine and greatly changed the traditional mode of transport,it not only improve the progress of work, but also saves a lot of manpower and reduce labor intensity. But trackless rubber-tyred vehicle exhaust emissions seriously threatened staff health in mine. The thesis aim at the experimental analysis on exhaust emission characteristics of the distribution for diesel in mine, and research exhaust distribution of the inhalable particulate matter and harmful gases in different ventilation speed and different vehicle operation speed for mine. The results can predict the distribution of diesel exhaust in mine, protect the workers' health and provide the safe operation environment have a certain significance. We designed and built a 1:10 tunnel system of simulation experiments referring to the actual size of Hongshiyan mine roadway in Shaanxi and similarity theory. Through the different ventilation speed and different vehicle operation speed within the simulated tunnel to study concentration distribution of the inhalable particulate matter and CO, CO2 and CH4 gas distribution under different experimental conditions to reveal the ventilation rate and vehicle speed for inhalable particulate matter and CO, CO2 and CH4 gas concentration spatial distribution in mine tunnel. Experimental results show that: For the exhaust gas concentration, CO2 is the largest concentration, the concentration of CH4 in the exhaust gas is a minimum concentration. Ventilation rate for the concentration of diesel exhaust distribution have a great impact. Increasing the ventilation rate, inhalable particulate matter and CO, CO2 and CH4 concentrations decreases at the same measuring point of the roadway, but not a linear relationship, according to energy conservation and control of pollutant concentration requirements in mine, wind speed should be controlled within an appropriate range. In the same section of mine, the gas concentration in the roadway more obvious stratification，due to wind speed and high temperatures result in the upper roadway large gas concentration, the low concentration in down space, toward the roadway in the same height, in the role of wind speed and vehicle speed, due to the different gas density, resulting in the distribution of the various gas concentrations are quite different. In the same section of roadway, when the vehicle is idling, due to diffusion, inhalable particulate matter, CO and CO2 concentration is greatest in the front of the car, in normal driving speed, with the vehicle speed increases, in the same measurement points, the concentration of inhalable particulate matter and CO2 increased, CO and CH4 concentration gradually decreases, and the vehicle speed for 0.5m/s concentration of CH4 is minimum. Speed of 0.5m/s is the moderate speed when trackless rubber-tyred vehicle traveling in actual mine, that is to say, when trackless rubber-tyred vehicle driving speed of 0.5m/s CH4 concentration of diesel exhaust is minimal.