双洞单向公路隧道互补式通风横通道相关参数研究

发布时间：2018-04-06 06:22

本文选题：公路隧道　切入点：双洞单向　出处：《兰州交通大学》2014年硕士论文

【摘要】：对于公路隧道通风系统通风方式的选择，在满足正常运营安全的情况下，力求通风方式简单，通风系统规模小，运营费用低。公路隧道双洞单向互补式通风技术在国内外隧道工程中已经得到了实施，这种新的通风方式逐渐成为双洞单向公路隧道通风的主要研究方向。本文依托福建某双洞单向公路隧道对互补式通风技术关键因素——横通道及其相关参数进行研究。双洞单向互补式通风技术适用于有一定坡度、左右线需风量差异大、且线间距较近的隧道。论文根据隧道远近期交通量，按照《公路隧道通风照明设计规范》（JTJ026.1－1999）分别计算出了该隧道左右两线的需风量。根据横通道位置的选取计算方法确定了横通道的合理位置，同时计算分析了横通道间距改变对交换风量大小的影响，结合CFD进行数值模拟计算结果，分析研究了横通道的间距、数目及位置对通风效果的影响。根据物理模型相似律，建立了隧道模拟试验模型。针对一条车行横通道、一条人行横通道的工况进行模型试验。左右线入口处风机模拟车辆活塞风，采集分析车辆活塞风作用下模型不同位置处断面速度分布。根据模型试验结果验证了数值模拟方法的可行性，同时分析了数值模拟结果误差产生的原因。运用ANSYS/FLOTRAN单元，根据隧道实际尺寸采用直角坐标系建立几何模型，针对长度为1000m的隧道，横通道数目相同工况下，模拟分析了横通道间距对隧道内速度场的影响；在横通道间距不变的工况下，模拟分析了横通道的数目改变对隧道速度场的影响。针对长为1500m的隧道，对横通道的数目、位置及间距分别进行模拟，分析不设置风机、依靠车辆活塞风作用下，横通道数目、位置及间距改变对通风速度场的影响。对比各工况得出结论，在此基础上分析了不同长度隧道自然通风的可能性，，为相关研究及实际工程设计提供参考。
[Abstract]:In the light of the selection of ventilation mode of highway tunnel ventilation system , the ventilation mode is simple , the scale of ventilation system is small and the operation cost is low . The two - hole unidirectional complementary ventilation technology of highway tunnel has been implemented in tunnel engineering at home and abroad . This new ventilation method gradually becomes the main research direction of double - hole unidirectional highway tunnel ventilation .

The two - hole one - way complementary ventilation technology is suitable for tunnels with a certain slope , a large difference in air volume between the left and right lines , and a close line spacing . According to the recent traffic volume of the tunnel , the reasonable positions of the transverse channels are calculated according to the selection calculation method of the cross - channel position , and the influence of the change of the cross - channel spacing on the size of the exchanged air quantity is calculated .

According to the similarity law of the physical model , the tunnel simulation test model is established . A model test is carried out for the working condition of a pedestrian crossing channel and a pedestrian cross - channel . The model test is carried out for the fan at the inlet of the left and right line . The velocity distribution of the cross section at different positions of the model under the action of the piston wind of the vehicle is collected . The feasibility of the numerical simulation method is verified according to the model test results , and the cause of the error of the numerical simulation result is analyzed .

According to the actual size of the tunnel , the geometric model is established by using ANSYS / FLOOD unit , and the influence of the cross - channel spacing on the velocity field in the tunnel is simulated under the same working conditions as the tunnel with length of 1000 m and the number of transverse channels .
The influence of the number of transverse channels on the tunnel velocity field is simulated under the condition of constant cross - channel spacing . For the tunnel with length of 1500m , the number , location and spacing of transverse channels are simulated respectively . The influence of the number , position and spacing of transverse channels on the ventilation velocity field is analyzed . The possibility of natural ventilation of different length tunnels is analyzed and the reference is provided for relevant research and practical engineering design .

【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U453.5

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