两河口长隧道独头掘进压入式施工通风三维数值模拟  

3D Numerical Simulation on Forced Construction Ventilation of Long Single Head Tunnel of Lianghekou

作　　者：邓祥辉[1,2] 刘钊 刘钊春[4] 

机构地区：[1]长安大学公路学院西安710064 [2]西安工业大学建工学院,西安710032 [3]国电大渡河流域水电开发有限公司,成都610041 [4]西安理工大学水利水电学院,西安710048

出　　处：《土木建筑与环境工程》2014年第2期35-41,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(50579092);交通部西部交通建设科技项目(2013318J12330);陕西省教育厅自然科学基金(2010JK599)

摘　　要：两河口公路隧道埋深大且无条件修建斜竖井,只能独头掘进3 000余m,施工通风问题突出。基于CFD理论,对压入式通风气流运动采用三维紊态RNGk-ε湍流模型进行三维数值模拟,得到了施工期隧道内流场和浓度场随时间在洞内的分布变化规律。研究表明,掌子面附近为回流区,风流结构复杂,回流区以外风流分布逐渐稳定;爆破后的有害气团在隧道内是一个动态"移动"和"扩散"的过程,这个过程中有害气团从爆破掌子面逐渐扩散,并被稀释和排出隧道。同时,在3种工况下,根据CO的进入浓度和允许浓度对工作人员的进洞时间进行了研究。There is no suitable condition to build any shaft（vertical or oblique shafts） due to the complex geological environment of Lianghekou. Furthermore, the tunnel has to be constructed blind heading. So the problem of ventilation is serious. Based on the theory of CFD, the wind current produced in forced ventilation is simulated by 3D RNG k-ε Turbulent Model,and then the Time-dependent Variation Rules of the flow field and the concentration field during the construction period are shown by numerical simulation of 3D. Results show that the backflow area which is located near the working face has the complex situation of wind current, and the air current distribution becomes stable gradually when it is far away from the backflow area. Meanwhile, the movement of the harmful air produced after blasting can be described as ＂moving＂ and ＂diffusing＂. The result of moving makes the harmful air run out of the tunnel from working face. The result of diffusing makes the harmful air deliquated along with the process of moving. In addition, the time that the workers spend on getting into the tunnel has been studied according to the concentrations of CO （in and allowance concentrations respectively）.

关 键 词：长隧道 压入式通风 三维数值模拟 进洞时间 

分 类 号：O319.56[理学—一般力学与力学基础]