高寒地区高速铁路路基冻深试验研究  

Experimental Study on Frost Depth of High Speed Railway Subgrade in Cold Region

作　　者：闫宏业[1,2] 蔡德钩[1,2] 杨国涛[3,4] 姚建平[1,2] 叶阳升[5] 张千里[1,2] 

机构地区：[1]中国铁道科学研究院高速铁路轨道技术国家重点实验室,北京100081 [2]中国铁道科学研究院铁道建筑研究所,北京100081 [3]中国铁路总公司科技管理部,北京100844 [4]北京交通大学土木建筑工程学院,北京100044 [5]中国铁道科学研究院,北京100081

出　　处：《中国铁道科学》2015年第3期1-6,共6页China Railway Science

基　　金：铁道部科技研究开发计划项目(Z2012-062);中国铁路总公司科研试验任务(Z2013-038);中国铁道总公司科技研究开发计划项目(2013G009-G;2014G009-A);中国铁道科学研究院基金项目(2013YJ032);铁道科学技术研究发展中心科研项目(J2014G003)

摘　　要：根据自动监测的哈大高速铁路沿线不同区段大气温度和路基冻深数据,研究哈大高速铁路沿线路基冻深的发展变化特征。结果表明：路基的冻深发展过程可分为快速发展和双向融化2个阶段,最大路基冻深可达300cm;在路基冻深快速发展阶段,路基冻深的发展速率随着里程的增大而增大,全线路基冻深的发展速度在1.11~2.89cm·d-1之间;在双向融化阶段,深层融化线的上升速度约为1.36cm·d-1,而表层融化线的上升速度约为3.86cm·d-1;由于大气温度波动较大,很难直观反映其对路基冻深的影响,因此采用冻结指数分析大气温度对路基冻深的影响,冻结指数与路基冻深的关系可用对数函数拟合;与土壤最大冻深相比,路基最大冻深普遍偏大,这是由于在哈大高速铁路的路基冻深范围内所用非冻胀填料与天然土壤相比细颗粒少、含水率低、导热系数高所致,因此,在进行冻深计算时应充分考虑填料的热物特性。According to the automatic monitoring data of atmospheric temperature and subgrade frost depth of Harbin-Dalian high speed railway along different sections, the development and change characteristics of subgrade frost depth along Harbin-Dalian high speed railway were researched. Results show that the de- velopment process of subgrade frost depth can be divided into two stages： the fast development stage and the bi-directional melt stage, with the maximum frost depth of 300 cm. In fast development stage, the de- velopment rate of subgrade frost depth increases with the increase of mileage, the daily development rate ranges from 1.11 cm to 2.89 cm. In bi-directional melt stage, the rising velocity of deep melting line is about 1.36 cm · d-1 , and the rising velocity of surface melting line is about 3.86 cm · d-1. Due to the sig- nificant fluctuation of atmospheric temperature, it is difficult to reflect the temperature effect on subgrade frost depth. Therefore, the freezing index is used to analyze the influence of atmospheric temperature on subgrade frost depth. The relationship between freezing index and subgrade frost depth can be fitted with logarithmic function. Compared with the maximum frost depth of soil, the maximum subgrade frost depth is generally larger. This is because the use of non-frost heave filling in the subgrade of Harbin-Dalian high speed railway. The non-frost heave filling has less fine particles, low water content and high coefficient of heat conductivity compared with natural soil. Therefore, in the calculation of frost depth, both the ther- mal and physical properties of filling should be fully considered.

关 键 词：高速铁路 路基 防冻胀结构 冻深 季节性冻土 冻结指数 融化线 填料 

分 类 号：U213.14[交通运输工程—道路与铁道工程]