Temperature and deformation analysis on slope subgrade with rich moisture of Qinghai-Tibet railway in permafrost regions

被引：0

作者：

Zhang M. ^{[1
,2
]}

Wen Z. ^{[1
]}

Xue K. ^{[1
,2
]}

Chen L. ^{[1
,2
]}

Li D. ^{[1
,2
]}

Gao Q. ^{[1
,2
]}

机构：

[1] State Key Laboratory of Frozen Soil Engineering C, old and Arid Regions Environmental Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, Gansu

[2] University of Chinese Academy of Sciences, Beijing

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2016年 / 35卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Numerical simulation; Permafrost; Qinghai-Tibet railway; Slope seepage; Slope subgrade; Soil mechanics;

D O I：

10.13722/j.cnki.jrme.2015.1437

中图分类号：

学科分类号：

摘要：

To analyze the stability of Qinghai-Tibet Railway (QTR) which was constructed on the slopes with rich moisture and high temperature in permafrost regions, a test section of traditional slope subgrade in K1139+940 of QTR was seleted to monitor temperature and deformation. A coupled heat-moisture-deformation model was used to simulate the influence of seepage on temperature and deformation of subgrade with the finite element method. The results showed that the temperature difference between the shady and sunny slopes was marked and the annual mean temperature at the depth of 0.5 m in the sunny slope could be over 2.5℃ higher than that in the shady slope. At the early operation of QTR, the artificial permafrost table moved downward and the ground temperatures rised under the left shoulder, and opposite under the right shoulder. The temperature difference between the shady and sunny slopes led to the uneven settlements transversely. Seasonal water flow in active layer had more remarkable effects on the temperature and deformation of the sunny slope than those of the shady slope. Moreover, water flow accelerated the warming and subsiding process of subgrade and intensified the asymmetrical distribution of thermal regime and deformation regime in subgrade. The ice-rich layer under the embankment will thaw completely and the maximum lateral deformation difference will be 18cm in 50 years after the constuction. The settlement due to thawing and compression of ice-rich layer and high temperature permafrost will dramatically reduce the stability of the subgrade slope.The effect of seepage on the thermal and deformation regimes should not be neglected for the subgrade slope with rich moisture and high temperature in permafrost regions. © 2016, Science Press. All right reserved.

引用

页码：1677 / 1687

页数：10

共 30 条

[1]

Yu Q., Fan K., Qian J., Et al., Key issues of highway construction in permafrost regions in China, Science China (Seris E), 44, 4, pp. 425-432, (2014)

[2]

Li Y., Wu Z., Wang Y., Et al., Test study on the application effect of the thermal pipes on the roadbed in the permafrost region along Qinghai-Tibet Railway, China Railway Science, 29, 6, pp. 6-11, (2008)

[3]

Cheng G., Sun Z., Niu F., Application of roadbed cooling methods in the Qinghai-Tibet Railway construction, Journal of Glaciology and Geocryology, 28, 6, pp. 797-808, (2006)

[4]

Su Q., Zhong B., Wang X., Et al., Instable deformation characteristics of sloping subgrade in permafrost region for Qinghai-Tibet Railway, Journal of Central South University: Science and Technology, 41, 5, pp. 1938-1944, (2010)

[5]

Xiong Z., Liao X., Xu B., Et al., Summary on research on slope and slope embankment in permafrost region of Qinghai-Tibet Railway, Journal of the China Railway Society, 32, 4, pp. 102-107, (2010)

[6]

Niu F., Ma W., Wu Q., Thermal stability of roadbeds of the Qinghai-Tibet Railway in permafrost regions and the main freezing-thawing hazards, Journal of Earth Sciences and Environment, 33, 2, pp. 196-206, (2011)

[7]

Shen Y., Study ofstability of embankment upon the slope in the permafrost area atAnduo sectionof Qinghai-Tibet Railway, (2007)

[8]

Yang R., Zhu B., Stability analysis of Qinghai-Tibet Railway slope embankment in permafrost regions, Rock and Soil Mechanics, 32, 7, pp. 2117-2122, (2011)

[9]

Jin H.J., Yu Q.H., Wang S.L., Et al., Changes in permafrost environments along the Qinghai-Tibet engineering corridor induced by anthropogenic activities and climate warming, Cold Regions Science and Technology, 53, 3, pp. 317-333, (2008)

[10]

Sheng Y., Ma W., Wen Z., Et al., Analysis of difference in thermal stable of railway embankments in permafrost regions, Chinese Journal of Rock Mechanics and Engineering, 24, 17, pp. 3197-3201, (2005)

← 1 2 3 →