摘要
为解决黄土高原既有铁路路基在冬季低温状态下反复冻胀的痼疾,以准池铁路K44+970~K45+020冻害路段为依托,开展了季节性冻土地区铁路路基人工供热防冻胀技术的现场应用研究。基于地源热泵技术,设计路基分布式供热系统,并对其施工步骤、运行控制方案进行了详细介绍。建立了温度和变形自动监测系统。在11月至4月采取人工供热方式防止路基冻胀,基于现场数据得到供热系统日换热温度、供热路基断面的地温、冻结深度、轨道冻胀变形量等随时间变化规律,分析供热性能与冻害整治效果。结果证明:供热系统在冬季严寒环境下的供热温度可达50℃以上;与天然断面相比,供热路基冻结深度和冻胀量显著减小,最大冻结深度由197 cm减小为88 cm,冻胀量从9.4 mm降低为±3 mm,有效抑制了冻害发育。
In order to solve the persistent problem of repeated frost heave of existing railway subgrade in low winter temperature,the field application research of artificial heating and frost heaving technology of railway subgrade in seasonal frozen soil area was carried out based on the K44+970~K45+020 frost-damaged section of Jungar-Shenchi Railway.Based on the ground source heat pump technology,the roadbed distributed heating system is designed,and its construction steps and operation control scheme are introduced in detail.An automatic monitoring system for temperature and deformation was established.From November to April,artificial heating was adopted to prevent frost heave of the roadbed,and based on the on-site data,the daily heat exchange temperature of the heating system,the ground temperature of the section of the heating subgrade,the freezing depth,the orbital frost heave deformation and other time changes were obtained,and the heating performance and frost damage remediation effect were analyzed.The test results prove that the heating temperature of the heating system in the cold winter environment can reach more than 50℃.Compared with the natural section,the freezing depth and frost heave amount of the heating subgrade were significantly reduced,the maximum freezing depth was reduced from 197 cm to 88 cm,and the frost heave amount was reduced from 9.4 mm to±3 mm,which effectively inhibited the development of frost damage.The use of roadbed active heating technology in the frozen area is an effective frost damage prevention and control scheme.
作者
何宝华
He Baohua(National energy group Xinshuo Jungar Banner-Shenchi Railway(Shanxi)Co.,Ltd.,Shuozhou,Shanxi 036002,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2023年第S02期920-925,954,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(42001059)
中央引导地方科技发展资金项目(226Z5402G)
关键词
路基冻胀
分布式供热系统
地源热泵
供热温度
冻结深度
冻胀量
Embankment frost heave
distributed artificial heating system
ground-source heat pump
heating temperature
freezing depth
frost heave deformation
