水电站调压室施工通风数值模拟与检测反馈研究

发布时间：2018-05-03 03:33

  本文选题：地下洞室群 + 调压室　； 参考：《工程科学与技术》2017年03期

【摘要】：大型地下洞室群施工期通风散烟效果直接影响施工效率和施工人员安全,结合黄金坪水电站地下厂房调压室工程,借助数值模拟和现场检测方法动态调整通风方案。采用FLUENT软件模拟洞室内通风流场,结果表明在初始通风方案下调压室风速总体满足规范要求,但在洞室交叉等边角处风速小于0.25 m/s,建议在洞室交叉处增设负压风机和射流风机,并封闭已完工且无后续通风需求的上层施工支洞,从实测结果来看,以上措施取得了良好的效果,洞室边角处的风流速度明显加快,均达到了规范要求。对地下洞室群通风质量进行现场跟踪检测,结果表明:初始通风方案经过优化后,洞室群风速总体有一定的增加;分析风速、风温、粉尘浓度3要素的相关性发现风速与粉尘浓度和风温呈明显的负相关;从风流要素沿程变化趋势来看,当洞室群内整体或局部区段风速低于0.5 m/s时,洞内温度基本都高于规范规定的28℃,粉尘浓度均大幅超过国家安全标准10 mg/m~3,故针对工程实际情况,为有效保证通风质量,建议工程中地下洞室群在开挖时洞内风速应不低于0.5 m/s。从实测数据可以发现,现场通风环境复杂,各洞室交叉处通风流场很不稳定,因此建议同类工程在有条件的情况下,在施工现场增设风流要素实时检测点,根据现场检测结果对通风方案进行动态优化,以全方位保证通风质量。
[Abstract]:The ventilation effect of large underground caverns during construction period has a direct impact on the construction efficiency and safety of construction personnel. Combined with the surge chamber project of underground powerhouse of Jinping Hydropower Station, the ventilation scheme is dynamically adjusted by means of numerical simulation and field detection method. The FLUENT software is used to simulate the ventilation flow field in the cavern. The results show that the initial ventilation scheme can meet the requirements of the specifications, but the wind speed is less than 0.25 m / s at the intersection of the cavern. It is suggested that the negative pressure fan and the jet fan should be added at the intersection of the cavern. The upper construction branch tunnel which has been completed and has no subsequent ventilation requirement has been closed. The measured results show that the above measures have achieved good results and the wind flow velocity at the edge corner of the tunnel has obviously accelerated and all of them have met the requirements of the specifications. The results show that after the initial ventilation scheme is optimized, the overall wind speed of the underground cavern group increases, the wind speed and temperature of the initial ventilation group are analyzed, and the ventilation quality of the underground cavern group is tested on the spot, and the results show that the initial ventilation scheme is optimized. The correlation of three elements of dust concentration showed that the wind speed was negatively correlated with the dust concentration and the wind temperature, and from the trend of the wind flow elements along the course, when the wind speed in the whole or local section of the cavern group was less than 0.5 m / s, The temperature in the tunnel is basically higher than the 28 鈩，

本文编号：1836813