Cooling effect of ripped-stone embankments on Qing-Tibet railway under climatic warming

被引:93
作者
Lai, YM [1 ]
Zhang, LX
Zhang, SJ
Mi, L
机构
[1] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China
[2] No Jiaotong Univ, Dept Civil Engn, Beijing 100044, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 2003年 / 48卷 / 06期
关键词
cooling effect; ripped-stone embankment; climatic warming;
D O I
10.1360/03tb9127
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The heat convection in ballast mass and ripped-stone mass in railway embankments is the problem of heat convection in porous media. In order to calculate the temperature distribution of Qing-Tibet railway embankment, from the governing equations used to study forced convection for incompressible fluids porous media, the finite element formulae for heat convection in porous media are derived by using Galerkin's method. The temperature fields of the traditional ballast embankment and the ripped-stone mass embankment, constructed on July 15, have been analyzed and compared under the case that the air temperature in Qinghai-Tibetan Plateau will be warmed up by 2.0degreesC in the future 50 years. The calculated results indicate that, the permafrost 5 m below the traditional ballast embankment will be thawed in the regions in which the air yearly-average temperature is larger than -3.5degreesC or the yearly-average temperature at the native surface is larger than -1degreesC. The embankment will cause large thawing settlement. The railway embankment will be damaged by permafrost degradation. The ripped-stone mass embankment can not only resist the effect of climatic warm up on it but also provide cool energy for the permafrost under it. It can assure permafrost stability and not subjected to thawing. Therefore, it is highly recommended that the ripped-stone mass embankment be taken as the Qing-Tibet railway embankment structure in high-temperature permafrost regions so that permafrost embankment can be protected as possible as we could.
引用
收藏
页码:598 / 604
页数:7
相关论文
共 11 条
[1]   ANALYSIS OF DISPERSION EFFECTS AND NONTHERMAL EQUILIBRIUM, NON-DARCIAN, VARIABLE POROSITY INCOMPRESSIBLE-FLOW THROUGH POROUS-MEDIA [J].
AMIRI, A ;
VAFAI, K .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1994, 37 (06) :939-954
[2]   A GENERAL ANALYTICAL APPROACH TOWARD THE THERMAL-CONDUCTIVITY OF POROUS-MEDIA [J].
BAUER, TH .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1993, 36 (17) :4181-4191
[3]   MODIFIED ZEHNER-SCHLUNDER MODELS FOR STAGNANT THERMAL-CONDUCTIVITY OF POROUS-MEDIA [J].
HSU, CT ;
CHENG, P ;
WONG, KW .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1994, 37 (17) :2751-2759
[4]   COUPLED HEAT AND MASS-TRANSFER BY NATURAL-CONVECTION FROM VERTICAL SURFACES IN POROUS-MEDIA [J].
LAI, FC ;
KULACKI, FA .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1991, 34 (4-5) :1189-1194
[5]   THEORETICAL AND EXPERIMENTAL HEAT AND MASS-TRANSFER IN HIGHLY POROUS-MEDIA [J].
LEE, KB ;
HOWELL, JR .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1991, 34 (08) :2123-2132
[6]   ESTIMATION OF THE STAGNANT THERMAL-CONDUCTIVITY OF SATURATED POROUS-MEDIA [J].
NIELD, DA .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1991, 34 (06) :1575-1576
[7]   NATURAL-CONVECTION IN VERTICALLY AND HORIZONTALLY LAYERED POROUS-MEDIA HEATED FROM THE SIDE [J].
POULIKAKOS, D ;
BEJAN, A .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1983, 26 (12) :1805-1814
[8]  
Qin D., 2002, COMPREHENSIVE EVALUA, P57
[9]   2-DIMENSIONAL NATURAL-CONVECTION IN AN ANISOTROPIC AND HETEROGENEOUS POROUS-MEDIUM WITH INTERNAL HEAT-GENERATION [J].
ROYER, JJ ;
FLORES, L .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1994, 37 (09) :1387-1399
[10]   SLIP AND NO-SLIP TEMPERATURE BOUNDARY-CONDITIONS AT THE INTERFACE OF POROUS, PLAIN MEDIA - CONVECTION [J].
SAHRAOUI, M ;
KAVIANY, M .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1994, 37 (06) :1029-1044