کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9521795 | 1347823 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Numerical analysis for critical height of railway embankment in permafrost regions of Qinghai-Tibetan plateau
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Numerical analysis for critical height of railway embankment in permafrost regions of Qinghai-Tibetan plateau Numerical analysis for critical height of railway embankment in permafrost regions of Qinghai-Tibetan plateau](/preview/png/9521795.png)
چکیده انگلیسی
In permafrost regions of Qinghai-Tibetan plateau, the critical embankment height must be considered in the process of the construction of railway, especially for the global climatic warming. In this paper, the two-dimensional numerical analysis for the critical embankment height (for coarse-grained soil) has been performed by using the finite element method. The mean annual air temperatures used in the calculation are â6.5, â6.0, â5.5, â5.0, 4.5 and â4.0 °C, respectively, and the value of temperature rise is taken as 1.10 °C in the coming 50 years. The minimum embankment heights derived from the analysis are 0.85, 0.92, 1.01, 1.18, 1.60 and 2.66 m for the different mean annual air temperatures, and the maximum embankment heights are 7.68, 7.55, 7.34, 7.00, 6.45 and 5.85 m, accordingly. On condition that the service life of railway embankment is 50 years, the critical value of the mean annual air temperature is â3.5 °C. Namely, in the areas where the mean annual air temperature is higher than â3.5 °C, the critical embankment height does not exist. Furthermore, by calculating, we can find that no matter whether high or low embankment is constructed, the ground temperature under the embankment will rise, and the permafrost will be in a degradation situation, which has been confirmed by the field observation data at Qinghai-Tibetan railway test sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cold Regions Science and Technology - Volume 41, Issue 2, February 2005, Pages 111-120
Journal: Cold Regions Science and Technology - Volume 41, Issue 2, February 2005, Pages 111-120
نویسندگان
Mingyi Zhang, Jianming Zhang, Yuanming Lai,