摘要
寒区隧道冻害问题与围岩温度及水压分布关系密切,采用铂金属热敏电阻元件与渗压计测试某寒区隧道的围岩温度与水压分布,以此为基础结合隧道实际,采用数值方法系统分析考虑渗流条件的温度场及冻胀力。研究结果表明:围岩水压力随时间变化基本稳定,在隧道边墙处约为60 k Pa,在隧底处约为80 k Pa,且在测试段落内水压沿隧道结构分布一致,地下水补给与排放处于平衡状态,基于实际入渗状态下的隧道洞口最大冻深达6.1 m,得到了最大冻深条件下冻胀力沿洞身的大小与分布。研究结果可为类似寒区隧道工程的设计与施工提供参考。
The frost damage problem of tunnel in cold area is closely related to surrounding rock temperature and water pressure distribution. The temperature and water pressure distribution of a cold area tunnel were tested by platinum metal thermistor element and osmometer. On this basis, combined with the actual tunnel, the temperature field and frost heaving force were analyzed by numerical method under the condition of seepage. The results show that the water pressure of surrounding rock is basically stable with time, and the water pressure is about 60 k Pa at the tunnel side wall and about 80 k Pa at the bottom of the tunnel. The distribution of water pressure is consistent along the tunnel structure in the test section, and groundwater recharge and emissions are in balance. The frozen depth of the tunnel entrance reaches 6.1 m in the actual infiltration state. Based on this the value and distribution of frost heaving force along the tunnel body are obtained under the condition of maximum frozen depth. The results can provide reference for the design and construction of similar cold area tunnels.
作者
李又云
张玉伟
赵亚伟
李盈灿
LI Youyun;ZHANG Yuwei;ZUAO Yawei;LI Yingcan(Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang＇an University,Xi＇an 710064,China;School of Civil Engineering,Xi＇an University of Architecture and Technology,Xi＇an 710055,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2018年第7期1778-1785,共8页
Journal of Railway Science and Engineering
基金
四川省交通运输厅科技资助项目(2012C5-3)
关键词
隧道工程
温度场
现场测试
数值模拟
渗流
tunnel engineering
temperature field
field test
numerical analysis
seepage
