Experimental and numerical analyses on traditional embankment of Qinghai-Tibet Railway

被引：0

作者：

Sun Z.-Z. ^{[1
]}

Ma W. ^{[1
]}

Wen Z. ^{[1
]}

Li D.-Q. ^{[1
]}

Feng W.-J. ^{[1
]}

机构：

[1] State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Acad. of Sci.

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2010年 / 32卷 / 03期

关键词：

Ground temperature; Permafrost; Qinghai-Tibet Railway; Traditional embankment;

D O I：

10.3969/j.issn.1001-8360.2010.03.013

中图分类号：

学科分类号：

摘要：

The Qinghai-Tibet Railway passes through permafrost regions in the form of traditional embankments, for some parts of sections. Thermal stability of such embankments is closely related to normal operation of the Railway. A test section of traditional embankments was constructed in the year of 2002~2003 to monitor the thermal regime of traditional embankments. On the basis of measured temperature data, the temperature variation processes of slope surfaces, temperature field distribution in embankment and underlayer soil body and heat flux into perennially frozen soil are analyzed. The results show as follows: The difference of heat transfer between the south-facing slope and north-facing slope is very obvious and the mean annual temperature of the south-facing slope surface is 2.9°C higher than that of the north-facing slope surface and the annual range of temperature of the north-facing slope surface is 2.2°C higher than that of the south-facing slope surface; attributing to the temperature boundary conditions at the surface of embankment, the thawing depth of the soil body beneath the south-facing slope surface is larger than that beneath the north-facing slope surface and the thermal regime of the subsoil body is in an increasing state; the heat absorbing intensity of the different parts of the subsoil body decreases gradually year after year. The temperature field distribution in the embankment is simulated with the finite element software under the assumption that the air temperature rises by 1.0°C for the period of 50 years. The simulated results show that the upper boundary of permafrost descends significantly and the temperature of permafrost mainly lies in the range between 0°C and -0.5°C.

引用

页码：71 / 76

页数：5

共 16 条

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