严寒地区铁路隧道中心深埋水沟设置长度计算方法

严寒地区铁路隧道防寒措施的合理设置直接关系到铁路运营安全。通过对已建成严寒地区隧道排水通道局部结冰情况和太阳辐射对应关系进行分析,隧道洞口的太阳辐射大小是影响隧道排水通道局部结冰的关键因素。为降低隧道冻害在铁路安全运营中产生的危害,量化计算严寒地区铁路隧道中心深埋水沟的设置长度,建立了隧道洞口太阳辐射评价标准,并基于已建成的位于严寒地区铁路隧道优化后的中心深埋水沟设置长度,结合太阳辐射指标、最冷月平均气温,采用麦夸特法(Levenberg-Marquardt)非线性回归计算出公式待定参数,得到了严寒地区隧道中心深埋水沟设置长度计算公式。

Research on Calculation Method of Setting Length of Central Deep Buried Ditch of Railway Tunnel in Severe Cold Area

The setting of reasonable cold protection measures in railway tunnels in severe cold regions is directly related to the operational safety of the railway. This paper analyzes the local ice formation in the drainage channel of a tunnel that has been built in severe cold regions and its corresponding relationship with solar radiation. The results show that the solar radiation at the tunnel entrance is a key factor affecting the local ice formation in the tunnel drainage channel. In order to reduce the damage caused by tunnel freezing in railway operation,the setting length of the central deep buried ditch of railway tunnel in severe cold area is quantitatively calculated. The solar radiation evaluation standard is formulated for the tunnel entrance based on the established depth of the deep buried ditch in the center of the railway tunnel after the optimization of the tunnel. With reference to the solar radiation index and the coldest monthly average temperature,Levenberg-Marquardt nonlinear regression is used to calculate the undetermined parameters of the formula,and the formula for calculating the setting depth of the deep buried ditch at the tunnel center in severe cold area is obtained.