Characteristics of subgrade temperature field of gravel road in high altitude permafrost region

BAO Wei-xing; LIU Ya-lun; MAO Xue-song; LI Wei; QIN Chuan; GUO Qiang; CHEN Rui

doi:10.19818/j.cnki.1671-1637.2023.04.004

Volume 23 Issue 4

Aug. 2023

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Article Navigation > Journal of Traffic and Transportation Engineering > 2023 > 23(4): 60-74

BAO Wei-xing, LIU Ya-lun, MAO Xue-song, LI Wei, QIN Chuan, GUO Qiang, CHEN Rui. Characteristics of subgrade temperature field of gravel road in high altitude permafrost region[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 60-74. doi: 10.19818/j.cnki.1671-1637.2023.04.004

Citation:

BAO Wei-xing, LIU Ya-lun, MAO Xue-song, LI Wei, QIN Chuan, GUO Qiang, CHEN Rui. Characteristics of subgrade temperature field of gravel road in high altitude permafrost region[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 60-74. doi: 10.19818/j.cnki.1671-1637.2023.04.004

Citation:

BAO Wei-xing, LIU Ya-lun, MAO Xue-song, LI Wei, QIN Chuan, GUO Qiang, CHEN Rui. Characteristics of subgrade temperature field of gravel road in high altitude permafrost region[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 60-74. doi: 10.19818/j.cnki.1671-1637.2023.04.004

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Characteristics of subgrade temperature field of gravel road in high altitude permafrost region

doi: 10.19818/j.cnki.1671-1637.2023.04.004

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Transportation Construction Administration of Xinjiang Uygur Autonomous Region, Urumchi 830000, Xinjiang, China

Funds:

National Natural Science Foundation of China 51878064

Major Science and Technology Projects of Xinjiang Uygur Autonomous Region 2020A03003-7

Natural Science Basic Research Project of Shaanxi Province 2021JM-180

More Information

Author Bio:
BAO Wei-xing(1979-), male, professor, PhD, baowx@chd.edu.cn
Received Date: 2023-03-15
Available Online: 2023-09-08
Publish Date: 2023-08-25

Abstract

Abstract

In order to study the effect of highway construction on the thermal state of permafrost layer in high altitude area, the investigation on the road diseases in the permafrost regions along the Xinjiang-Xizang Highway was conducted, a temperature monitored cross-section of the ground and meteorological monitoring sites were built in the area with an altitude of 5 400 m, and the air temperature, ground temperature and radiation intensity were monitored. According to the monitoring result, the heat flux at the upper limit of the frozen soil was calculated, and the changing characteristics of ground temperature in permafrost layer were analyzed. Based on the heat conduction theory and heat diffusion theory, a ground temperature-depth theoretical prediction model of the permafrost under natural subgrade and normal subgrade was proposed. Research results show that the road diseases in the permafrost region are mainly caused by the large amount of heat absorption of asphalt pavement. Although the active and passive protection measures such as hot rods and thermal insulation layers have some positive effects, they cannot change the rapid degradation of the permafrost. The largest temperature difference between the natural foundation and the subgrade center in the study area is up to 19.66 ℃ in a day, and the temperature difference between the left and right shoulders is up to 4.94 ℃ in a day. The temperature of the deep permafrost under the natural foundation maintains at about -6.0 ℃, and the temperature of the deep permafrost in the lower part of the subgrade center maintains at about -5.6 ℃. The temperature of the lower part of the subgrade is more drastic than that of the natural foundation, and the temperature of the subgrade of the isothermal layer is higher. The radiation intensity in the study area increases significantly at 10:00-18:00 in a day, the peak radiation intensity is between March and June in a year, and the shallow ground temperature is mainly affected by the annual cycle variation of radiation intensity. The annual heat fluxes of the permafrost layer in the lower part of the natural foundation, subgrade center, shady slope shoulder, and sunny slope shoulder are -4 001, -14 649, -4 487 and 58 303 kJ·m^-2, respectively. The heat dissipation rate of the subgrade center is greater than that of the natural foundation, and a large amount of heat is absorbed at the shoulder of the sunny slope road. The isotherm of the natural foundation appears at a depth of 9.79 m, while the isotherm of the subgrade center appears at a depth of 9.61 m, indicating the isotherm of the subgrade center is shallower. The compaction of the subgrade soil makes the temperature change of the shallow part of the permafrost more obvious, which has a positive effect on the heat dissipation of the lower permafrost in the short term. Under the sunny-shady slopes effect, the increase of the permafrost temperature in the lower part of the slope reduces the thermal stability of the subgrade and results in uneven settlement.
- subgrade engineering,
- permafrost subgrade,
- ground temperature prediction model,
- in-site monitoring,
- heat flux,
- heat diffusion theory

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References(32)

References

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Characteristics of subgrade temperature field of gravel road in high altitude permafrost region

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