›› 2012, Vol. 33 ›› Issue (S2): 377-383.

• Numerical Analysis • Previous Articles     Next Articles

Numerical analysis of forced convection characteristics of riprap slope embankment in Qinghai-Tibet railway

BIAN Xiao-lin1, HE Ping1, WU Qing-bai2, SHI Ye-hui1   

  1. 1. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China; 2. Tunnel and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044,China; 3. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2011-12-22 Online:2012-11-22 Published:2012-12-11

PDF (Chinese)

915

Abstract: Based on the continuity, non-Darcy momentum and energy equations for fluid convection in porous media, the velocity and temperature fields of riprap slope embankments under strong ventilation condition were studied numerically in permafrost regions in the Qinghai-Tibet railway. The results show that the riprap slope embankments play a significant role in protecting the permafrost, under which the upper limit of permafrost increasing obviously in summer and the re-frozen process is much faster in winter compared to the permafrost under the native ground surface. The cooling effect of riprap slope embankment is limited mainly in the range of near slope embankment; so the centre of embankment can not be protected very well. With the climate warming, a thawing interlayer looks like an eyeball may be formed in the centre of permafrost under the riprap slope embankment, which is not conducive to the stability of slope embankment. The direction of air flow is from down to up along the slope in riprap slope at following wind side; but it is from up to down at counter wind side. The motion type of air flow in the riprap can be defined as roll flow; and the flow velocity is much larger at the surface of riprap than the inner. Besides, the distribution interval of velocity is between 1.24×10-3 m/s and 12.8 m/s; and the numerical result is mainly in accordance with the site test results.

Key words: permafrost, riprap slope embankment, forced convection, cooling effect, temperature field, flow velocity field

CLC Number: 

  • TU471.7
[1] WANG Qing-zhi, FANG Jian-hong, CHAO Gang. Analysis of cooling effect of block-stone expressway embankment in warm temperature permafrost region [J]. Rock and Soil Mechanics, 2020, 41(1): 305-314.
[2] LIU Wei-jun, ZHANG Jin-xun, SHAN Ren-liang, YANG Hao, LIANG Chen, . Experiments on temperature field of multi-row-pipe partial horizontal freezing body in Beijing sand-gravel stratum under seepage [J]. Rock and Soil Mechanics, 2019, 40(9): 3425-3434.
[3] WANG Hong-lei, SUN Zhi-zhong, LIU Yong-zhi, WU Gui-long, . The monitoring analysis of the thermal-mechanical response on embankment with thawed interlayer along Qinghai-Tibet Railway [J]. Rock and Soil Mechanics, 2019, 40(7): 2815-2824.
[4] ZHANG Ming-li, WEN Zhi, DONG Jian-hua, WANG De-kai, HOU Yan-dong, WANG Bin, GUO Zong-yun , WEI Hao-tian, . Mechanism of climate warming on thermal-moisture dynamics of active permafrost layer considering effect of rainfall [J]. Rock and Soil Mechanics, 2019, 40(5): 1983-1993.
[5] GAO Qiang, WEN Zhi, WANG Da-yan, NIU Fu-jun, XIE Yan-li, GOU Ting-tao,. Study on the instability process of slopes in permafrost regions by direct shear test of freezing-thawing interface [J]. , 2018, 39(8): 2814-2822.
[6] ZHANG Pei-ran, HUANG Xue-feng, YANG Xiao-hui, LIU Zi-long, ZHU Zhong-hua，. Experiment on coupling effect of water and thermal field and salt-expansion deformation of salty soil [J]. , 2018, 39(5): 1619-1624.
[7] ZHANG Yu-wei, XIE Yong-li, LI You-yun, LAI Jin-xing，. A frost heave model based on space-time distribution of temperature field in cold region tunnels [J]. , 2018, 39(5): 1625-1632.
[8] TIAN Ya-hu, HU Kang-qiong, TAI Bo-wen, SHEN Yu-peng, WANG Teng-fei, . Influence of different factors on horizontal frost heaving force against canal [J]. , 2018, 39(2): 553-560.
[9] REN Jian-xi, SUN Jie-long, ZHANG Kun, WANG Jiang, WANG Dong-xing. Mechanical properties and temperature field of inclined frozen wall in water-rich sand stratum [J]. , 2017, 38(5): 1405-1412.
[10] SHI Rong-jian, YUE Feng-tian, ZHANG Yong, LU Lu, . Model test on freezing reinforcement for shield junction Part 1: Distribution characteristics of temperature field in soil stratum during freezing process [J]. , 2017, 38(2): 368-376.
[11] ZHANG Kai-jian, SUN Hong, NIU Fu-jun, GE Xiu-run，. Seismic response of low-angle soil slope in permafrost regions [J]. , 2017, 38(12): 3469-3475.
[12] SHU Cai, WANG Hong-tu, SHI Feng, HU Guo-zhong ，. A fully coupled thermal-hydrological-mechanical model for gas seepage based on binary-energy-state heat theory [J]. , 2017, 38(11): 3197-3204.
[13] LIU Ming-hao, NIU Fu-jun, LIN Zhan-ju, LUO Jing. Long-term cooling effect and deformation characteristics of a U-shaped crushed rock embankment in warm permafrost regions [J]. , 2017, 38(11): 3304-3310.
[14] SHEN Yan-jun，YANG Geng-she，RONG Teng-long，LIU Hui. Analysis of evolution of temperature field and frost heaving in hard rock with surface cracks under low temperature environment [J]. , 2016, 37(S1): 521-529.
[15] TIAN Bao-zhu , LIU Shan-jun , ZHANG Yan-bo , LIANG Peng , LIU Xiang-xin , . Laboratory simulation of temporospatial evolution characteristics of infrared radiation in the process of rockburst in granite tunnel [J]. , 2016, 37(3): 711-718.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] XIANG Tian-bing, FENG Xia-ting, CHEN Bing-rui, JIANG Quan, ZHANG Chuan-qing. Rock failure mechanism and true triaxial experimental study of specimens with single structural plane under three-dimensional stress[J]. , 2009, 30(10): 2908 -2916 .
[2] ZHANG Chang-guang，ZHANG Qing-he，ZHAO Jun-hai. Unified solutions of shear strength and earth pressure for unsaturated soils[J]. , 2010, 31(6): 1871 -1876 .
[3] YANG Tian-hong, CHEN Shi-kuo, ZHU Wan-cheng, LIU Hong-lei. Coupled model of gas-solid in coal seams based on dynamic process of pressure relief and gas drainage[J]. , 2010, 31(7): 2247 -2252 .
[4] HU Xiu-hong，WU Fa-quan. Research on two-parameter negative exponential distribution of discontinuity spacings in rock mass[J]. , 2009, 30(8): 2353 -2358 .
[5] LI Wei-chao, XIONG Ju-hua, YANG Min. Improved method for calculating anti-overturning safety factor of cement-soil retaining wall in layered soil[J]. , 2011, 32(8): 2435 -2440 .
[6] ZHANG Gui-min , LI Yin-ping , SHI Xi-lin , YANG Chun-he , WANG Li-juan. Research on a model material preparation method for alternate layered rock mass and preliminary experiment[J]. , 2011, 32(S2): 284 -289 .
[7] LI Shu-cai , ZHAO Yan , XU Bang-shu , LI Li-ping , LIU Qin , WANG Yu-kui . Study of determining permeability coefficient in water inrush numerical calculation of subsea tunnel[J]. , 2012, 33(5): 1497 -1504 .
[8] Lü Ya-ru , DING Xuan-ming , SUN Jia , KONG Gang-qiang . Analysis of ultimate bearing capacity of X-section cast-in-place concrete pile composite foundation under rigid load[J]. , 2012, 33(9): 2691 -2696 .
[9] WANG Hong-xin , SUN Yu-yong . Test study and bar system FEM for foundation pits considering excavation width[J]. , 2012, 33(9): 2781 -2787 .
[10] LIU Fei-yu , YU Wei , CAI Yuan-qiang , ZHANG Meng-xi . Model test and numerical analysis of geogrid-reinforced pile-supported foundation[J]. , 2012, 33(S1): 244 -250 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd