A DESIGN METHOD OF ROAD TUNNELS IN COLD REGION

寒冷地区公路隧道设计方法

基本信息

批准号：
09650518
负责人：
MIKAMI Takashi
金额：
$ 1.47万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Icicles and side wall ices in tunnels became a problem for transportation and maintenance. Recently a heat insulator for icicle prevention at the lining surface has been developed in the existing tunnels. The purpose of this study is to propose a simplified design procedure for heat insulator.This project is summarized as follows :(l) A simple practical equation for estimating the thickness of heat insulator is presented. The equation is obtained by using a one-dimensional tunnel-ground model and a non-steady periodic thermal analysis. A comparison with other solutions suggests that the proposed equation provide satisfactory accuracy. By using the equation presented, we can reasonably determine the optimum material of heat insulator and its optimum thickness. In addition, the equation is useful for a better understanding for the thermal characteristics of the tunnel-ground system.(2)In order to identify unknown thermal parameters (thermal conductivity and heat capacity in ground) in appearing the proposed equation, the extended Kalman filter in combination with the one-dimensional finite element thermal analysis is used. A comparison of the temperatures calculated from identified parameters with the measured fild data shows that the method is sufficiently accurate for practical purposes.(3)In order to estimate the unknown temperatures at a planning site of road tunnels, Semi-Yariogram is used on the basis of the a stochastic method. A comparison of the estimated temperatures with the measured fild data gives satisfactory results.

隧道中的冰柱和侧壁冰成为运输和维护的问题。最近，现有的隧道中已经开发出一种用于衬砌表面冰柱预防的热绝缘子。这项研究的目的是为热绝缘体提出简化的设计程序。该项目总结如下：（l）提出了一个简单的实用方程，用于估计热绝缘子的厚度。该方程是通过使用一维隧道地面模型和非稳态的周期热分析获得的。与其他解决方案的比较表明，所提出的方程式提供了令人满意的精度。通过使用提出的方程式，我们可以合理地确定热绝缘子的最佳材料及其最佳厚度。此外，该方程对于更好地理解隧道地面系统的热特性很有用。（2）为了识别未知的热参数（地面的热导率和热容量）在出现所提出的方程式中，使用了与一维有限元元件结合使用的扩展卡尔曼滤波器。从确定的参数与测量的fild数据计算得出的温度的比较表明，该方法对于实际目的而言足够准确。（3）为了估算道路隧道计划地点的未知温度，半Yariogram在A-Yariogram的基础上使用了一种随机方法。估计温度与测量的FILD数据的比较可令人满意。