|Table of Contents|

Calculation model of permafrost table of XPS insulated board subgrade in warm permafrost regions(PDF)

《长安大学学报》自然版[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2017年04期
Page:
1-11
Research Field:
冻土路基专栏
Publishing date:

Info

Title:
Calculation model of permafrost table of XPS insulated board subgrade in warm permafrost regions
Author(s):
TAI Bo-wen LIU Jian-kun FANG Jian-hong XU An-hua LIU Lei WANG Teng-fei
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. Key Laboratory of Highway Construction & Maintenance Technology in Permafrost Region, Qinghai Research Institute of Transportation, Xining 810008, Qinghai, China
Keywords:
road engineering calculation model of permafrost table numerical calculation Gonghe-Yushu Expressway
PACS:
U416.168
DOI:
-
Abstract:
In order to reveal the decline laws of permafrost table of expressway subgrades in warm frozen soil regions of Qinghai-Tibet Plateau, ensure the long-term thermal stability of subgrades in warm permafrost regions and reduce subgrade diseases which caused by the degradation of artificial permafrost table, firstly, the longitudinal and lateral distributions of ground temperature of XPS insulated board subgrade and degradation characteristics of artificial permafrost table at early stage of subgrade construction were analyzed. Secondly, the moisture-heat coupling differential equation of permafrost was solved through unsaturated soil seepage and heat transfer theory, to realize the unity coupling of moisture field and temperature field of frozen soils. The temperature field simulated by moisture-heat model was compared with the measured temperature field to verify the correctness of the model. Then, the degradation laws of artificial permafrost table of XPS insulated board subgrade under five conditions (filling type, annual mean ground temperature, height of subgrade, laying location of XPS thermal insulation board and climate warming) were analyzed. Finally, main factors influencing the degradation of artificial permafrost table were calculated by MATLAB, and the multivariate linear regression was carried out, so as to establish the calculation model for artificial permafrost table of XPS insulated board subgrade in warm permafrost regions. The results show that temperatures on the left side of XPS insulated board subgrade is higher than that on the right side within a certain range. The artificial permafrost table lifts 60 cm at the early stage of subgrade construction, then, decreases gradually with a speed of 10 cm per year. The change of permafrost table leads to a certain increase of temperature in deep permafrost. Under the five conditions, the artificial permafrost table of XPS insulated board subgrade in warm permafrost regions increases linearly with time. Filling type and climate warming are two major factors affecting the decline of permafrost table. The model can provide favorable references for prediction and prevention of long-term deformation of highway subgrades in warm permafrost regions.

References:

-

Memo

Memo:
-
Last Update: 2017-07-17