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| Numerical Simulation of the Temperature Field and Deformation of Subgrade for Sunny-Shady Slopes in a Seasonal Frozen Region |
| WANG Wei-na1,2, QIN Yu3, LI Xiao-fei2, CHEN Hui-qiang2, WANG Di4 |
1. National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China;
2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
3. CREEC(Chongqing) Survey, Design and Research Co. Ltd, Chongqing 400023, China;
4. Pavement Engineering Center, Technical University of Braunschweig, Braunschweig 38106, Germany |
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Abstract The second and third types of boundary conditions were mixed to simulate the change rule for the subgrade temperature field under the actual climate condition in a seasonal frozen region. The temperature difference between sunny and shady slopes was also analyzed. The freezing and thawing coefficients were introduced to compute the subgrade deformation caused by temperature differences considering the location and shape of the freezing fringe. Then, the mechanism of subgrade deformation was discussed. Results show the following conditions. (1) When groundwater exists, an uneven horizontal deformation is strongly affected by the temperature difference caused by slopes. (2) The deformations of the shoulder and bottom of the northern slope are greater during the freezing process than during the thawing process, and maximum deformation occurs at the top of the northern slope during the thawing process. Meanwhile, tension damage is likely to appear on both sides of the slope and at the top of the subgrade near the northern slope. Thus, for subgrade design and maintenance in a seasonal frozen region, the northern slope and the shoulder near the northern slope can be treated separately. Different designs and maintenance procedures can be applied to decrease temperature difference.
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Received: 19 September 2016
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| Fund:Supported by the National Science Foundation of China (51508064, 51408083); the Postdoctoral Science Foundation of China (2014M562287); Frontier and Applied Basic Research Projects of Chongqing (cstc2014jcyjA30018, cstc2016jcyjA0128); the Special Foundation for Postdoctoral Science Foundation of Chongqing (Xm2014094), and State and Local Engineering Laboratory for Civil Engineering Material of Chongqing Jiaotong University (LHSYS-2016-01) |
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Corresponding Authors:
WANG Wei-na
E-mail: qinyubridge@163.com
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2018, Vol. 12 
