高速公路隧道施工压入式通风系统参数优化与数值计算  

Parameter Optimization and Numerical Calculation of Forced Ventilation System for Expressway Tunnel Construction

作　　者：罗刚[1] 宋子源 游鸿达 杨云生 严荔 张宇航[1] LUO Gang;SONG Zi-yuan;YOU Hong-da;YANG Yun-sheng;YAN Li;ZHANG Yu-hang(Chang'an University,Xi'an 710064,China)

机构地区：[1]长安大学,西安市710064

出　　处：《公路》2024年第9期393-400,共8页Highway

基　　金：国家自然科学基金项目,项目编号51708042;陕西省自然科学基础研究计划项目,项目编号2019JQ-008;陕西省自然科学基金项目,项目编号2023-JC-YB-392。

摘　　要：为了理清压入式通风系统参数对隧道施工通风效果的影响规律,利用流体力学软件Fluent建立压入式通风计算模型,研究全断面施工和台阶法施工时,风管布设角度、风管出口距离及上台阶高度、台阶长度等4个因素对流场特性的影响。结果表明:全断面施工时,风管布设角度为30°时掌子面通风效率最高;台阶法施工时,风管布设角度在50°时掌子面通风效率最高;上台阶高度在4 m左右时,在台阶与射流之间的空间涡流范围最小;台阶长度为10 m左右时通风效率最高;全断面施工并采用压入式的通风方式时,风管中心与隧道中线的夹角应在30°左右为宜;台阶法施工并采用压入式的通风方式时,风管中心与隧道中线的夹角应在50°左右为宜;上台阶的高度在4 m左右时风管下方和台阶前方的涡流最小;台阶长度为10 m左右时通风效率最高,射流可以得到充分发展。In order to clarify the influence of the parameters of the pressure ventilation system on the ventilation effect during tunnel construction,the fluid mechanics software Fluent is used to establish a calculation model for pressure ventilation,the flow field characteristics are affected by four factors:the angle of duct arrangement,the distance of duct exit,the height of upper step and the length of step.The results show that the ventilation efficiency is the highest when the air duct angle is 3o°in full-section construction,and the ventilation efficiency is the highest when the air duct angle is 50°in step construction.When the height of the upper step is about 4 m,the space vortex between the step and the jet is the smallest,and when the length of the step is about 1o m,the ventilation efficiency is the highest.Therefore,the angle between the center of the air duct and the middle line of the tunnel should be about 3o°when the full-section construction and the pressing ventilation method are adopted,and when the step construction and the pressing ventilation method are adopted,the angle between the center of the air duct and the middle line of the tunnel should be about 5o°.The height of the upper step should be about 4 m,at which time the eddy current below the air duct and in front of the step is the smallest.The ventilation efficiency is the highest when the length of the step is about 1o m,the jet can be fully developed.

关 键 词：公路隧道 压入式通风 数值模拟 参数优化 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]