多年冻土区宽幅公路路基的温度特性模拟分析  

Simulation Analysis on Thermal Characteristics of Large-width Subgrade in Permafrost Regions

作　　者：陈佳宇[1,2] 田亚护[1,3] 池秀静 

机构地区：[1]青海省交通科学研究所,西宁810008 [2]北京市科学技术情报研究所,北京100048 [3]北京交通大学土木建筑工程学院,北京100044 [4]大地工程开发(集团)有限公司,北京100102

出　　处：《路基工程》2015年第3期22-29,共8页Subgrade Engineering

基　　金：国家自然科学基金(41271072);中央高校基本科研业务费专项资金(2011JBZ009);多年冻土地区公路建设与养护技术交通行业重点实验室青海研究观测基地开放基金项目(20121208)

摘　　要：为研究多年冻土区G214高等级公路中隔热层、片石层对24 m宽路基的热影响效果,根据多孔介质的热对流及考虑相变的传热理论,分别对两种结构路基的温度场进行了模拟分析。计算结果表明:当路基宽度从12 m增加到24 m时,隔热层厚度应从10 cm增加到30 cm才可确保路基下冻土上限的稳定,但保温层所产生的热积累效应将使路基下冻土温度明显升高,且高温冻土核范围较大。从工程措施的可靠性及工程费用角度考虑,EPS隔热层不适用于G214宽幅路基中。如采用厚度大于1.8 m的片石层,则可稳定路基下冻土上限和增加冻土的冷储量,但同时要加强对路基边坡的热防护。Simulation analysis is respectively performed for the temperature of two subgrade structures according to the thermal convection and thermal conduction theory with phase change in porous media to study the thermal effect of thermal insulating course and flag course on 24m-width subgrade of G214 highway in permafrost region. The numerical results show that the thickness of thermal insulating course only changes from 10cm to 30em to ensure the upper reliability limit of the subgrade on frozen soil when the width of subgrade varies from 12m to 24m. However, the thermal accumulation effect of thermal insulating course may result to the temperature increment of frozen soil and the large scope of warm temperature core in foundation occurs. With considering other factors, such as reliability of construction technology and engineering cost, etc, the thermal insulating course EPS may be not applied to G214 width subgrade. When the thickness of broken rock mass is more than 1.8 m, the broken rock mass subgrade can protect the permafrost table and provide cool energy for the permafrost under the subgrade, meanwhile, the thermal control measures must be enhanced for subgrade slope.

关 键 词：多年冻土 宽幅路基 温度特性 数值模拟 

分 类 号：U416.1[交通运输工程—道路与铁道工程]