A Freezing-Thawing Damage Characterization Method for Highway Subgrade in Seasonally Frozen Regions Based on Thermal-Hydraulic-Mechanical Coupling Model
| Autor: | Chao Zeng, Xiao Liu, Qingsong Deng, Chen Fengguang, Xianzhi He, Siyu Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
China
Freezing thawing Convective heat transfer TP1-1185 Biochemistry Article Analytical Chemistry Thermal hydraulics Soil Freezing Coupling (piping) COMSOL multi-physics Geotechnical engineering highway subgrade frost heave Electrical and Electronic Engineering Instrumentation thermal–hydraulic–mechanical coupling freeze–thaw damage degree Chemical technology Frost heaving Water Subgrade Thermal conduction Atomic and Molecular Physics and Optics Environmental science seasonally frozen soil human activities |
| Zdroj: | Sensors (Basel, Switzerland) Sensors Volume 21 Issue 18 Sensors, Vol 21, Iss 6251, p 6251 (2021) |
| ISSN: | 1424-8220 |
| Popis: | Seasonally frozen soil where uneven freeze–thaw damage is a major cause of highway deterioration has attracted increased attention in China with the rapid development of infrastructure projects. Based on Darcy’s law of unsaturated soil seepage and heat conduction, the thermal–hydraulic–mechanical (THM) coupling model is established considering a variety of effects (i.e., ice–water phase transition, convective heat transfer, and ice blocking effect), and then the numerical solution of thermal–hydraulic fields of subgrade can be obtained. Then, a new concept, namely degree of freeze–thaw damage, is proposed by using the standard deviation of the ice content of subgrade during the annual freeze–thaw cycle. To analyze the freeze–thaw characteristics of highway subgrade, the model is applied in the monitored section of the Golmud to Nagqu portion of China National Highway G109. The results show that: (1) The hydrothermal field of subgrade has an obvious sunny–shady slopes effect, and its transverse distribution is not symmetrical (2) the freeze–thaw damage area of subgrade obviously decreased under the insulation board measure (3) under the combined anti-frost measures, the maximum frost heave amount of subgrade is significantly reduced. This study will provide references for the design of highway subgrades in seasonally frozen soil areas. |
| Databáze: | OpenAIRE |
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