摘要
针对寒冷地区隧道洞口段因受洞外气候影响严重而对防冻保温设计要求高的问题,以京沈高速铁路支线天秀山隧道为背景,采用数值模拟方法研究了寒冷地区隧道洞口段温度场及防冻保温措施。研究结果表明:在中心深埋水沟顶部和边墙碎石盲沟外侧设置保温板可以防止负温影响到中心深埋水沟和边墙碎石盲沟;仰拱混凝土无法隔绝负温,仰拱底部的横向排水管、二次衬砌背部的环向透水盲管冬季受负温影响易发生冻结。提出对横向排水管包裹防冻保温层,并将保温板厚度增到8 cm的优化方案。优化后横向排水管和环向透水盲管不再出现负温,满足寒冷地区冬季正常工作要求。
In order to solve the problem of high requirements for anti-freezing and warm-keeping design of tunnel portal section in cold area,taking the Tianxiushan Tunnel of Beijing-Shenyang high speed railway branch line as the background,the temperature field and anti-freezing and warm-keeping measures of tunnel portal section in cold area were studied by numerical simulation method.The results show that setting temperature insulation board at the top of the central deep buried ditch and outside the gravel blind ditch on the side wall can prevent negative temperature from affecting the central deep buried ditch and side wall gravel blind ditch.The concrete of inverted arch cannot be isolated from negative temperature,and the transverse drainage pipe at the bottom of inverted arch and the circumferential permeable blind pipe at the back of secondary lining are easy to freeze due to negative temperature in winter.The optimization scheme that wrap the anti-freezing insulation layer on the transverse drainage pipe and increase the thickness of temperature insulation board to 8 cm is put forward.After optimization,the negative temperature of transverse drainage pipe and circumferential permeable blind pipe no longer appears,which can meet the requirements of normal operation in cold areas in winter.
作者
丁然
DING Ran(China Railway Tunnel Group Erchu Co.Ltd.,Sanhe Hebei 065201,China)
出处
《铁道建筑》
北大核心
2020年第10期68-72,共5页
Railway Engineering
关键词
铁路隧道
防冻保温措施
数值模拟
寒区隧道
温度场
保温板
railway tunnel
anti-freezing and warm-keeping measures
numerical simulation
cold area tunnel
temperature field
temperature insulation board
作者简介
丁然(1992—),男,工程师。E-mail:450191621@qq.com。
