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Sciences in Cold and Arid Regions ›› 2021, Vol. 13 ›› Issue (5): 419-429.doi: 10.3724/SP.J.1226.2021.21026.

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Study on thermal-state variation of high-grade highway embankment under different pavement conditions

QingZhi Wang1(),AnHua Xu2,KeJin Wang3   

  1. 1.School of Civil Engineering, Qinghai University, Xining, Qinghai 810016, China
    2.Qinghai Communications Technical College, Xining, Qinghai 810016, China
    3.Qinghai Transportation Holding Group Co. LTD, Xining, Qinghai 810016, China
  • Received:2021-04-20 Accepted:2021-09-14 Online:2021-10-31 Published:2021-12-03
  • Contact: QingZhi Wang E-mail:wangqingzhi87@qhu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (Nots. 41801046, 42161026), the Natural Science Foundation of Qinghai Province(2021-ZJ-716);the Transportation Science and Technology Project of Qinghai Province(2019-06 & 2018-02)

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Abstract:

The research shows that the selection of pavement type is very important for the thermal stability of high-grade highway embankment in permafrost regions because of the different solar absorption rates between asphalt concrete and asphalt concrete pavement. In this paper, the common embankment of high-grade highway in permafrost regions is selected as the research object to study the influence of asphalt concrete and cement concrete pavement on the embankment temperature, freeze-thaw cycle process and the change law of the permafrost table, which provides a basis for the use of reasonable pavement materials in permafrost regions.

Key words: high-grade highway embankment, pavement, thermal-state, permafrost table

Figure 1

The geographical location of Study and Observation Base of Permafrost in Qinghai (Wang et al., 2020)"

Figure 2

The High-grade highway embankment under different pavement"

Figure 3

The High-grade highway embankment under asphalt and cement concrete pavement"

Figure 4

The embankment with temperature monitor"

Figure 5

The monitored temperature under 0.5 m from pavement"

Table 1

The temperature under 0.5 m from pavement in shady-sunny shoulder"

VariationAsphalt concrete pavementCement concrete pavement
Shady-shoulderSunny-shoulderShady-shoulderSunny-shoulder
Average temperature (℃)0.711.510.961.35
Amplitude (℃)9.219.039.7110.91

Table 2

The temperature under 0.5 m from pavement in shady-sunny shoulder"

VariationAsphalt concrete pavementCement concrete pavement
Sunny-shoulderShady-shoulderSunny-shoulderShady-shoulder
Average temperature (°C)0.291.510.251.29
Amplitude (°C)3.414.013.524.88

Figure 6

The monitored temperature under 0.5 m from natural ground"

Figure 7

The monitored temperature under 5.5 m from natural ground"

Figure 8

Variation of annual mean temperature with depth on shoulder of shady-sunny shoulder under asphalt concrete pavement"

Figure 9

Variation of annual mean temperature with depth on shoulder of shady-sunny shoulder under cement concrete pavement"

Figure 8

Freeze-thaw cycle process of embankment center under asphalt concrete pavement"

Figure 10

Comparison of freeze-thaw cycle process of shady-sunny shoulder"

Figure 11

Comparison of freeze-thaw cycle processes on sunny-shoulder shoulder of embankment"

Figure 9

Freeze-thaw cycle process of embankment center under cement concrete pavement"

Figure 12

Permafrost table of embankment under asphalt concrete pavement"

Figure 13

Degradation of permafrost table of subgrade under asphalt concrete pavement"

Figure 15

Degradation of permafrost table of subgrade under cement concrete pavement"

Table 3

Permafrost degradation rate"

ItemNatural groundEmbankmentShady-shoulderCenterSunny-shoulder
Degradation rate (cm/a)0.075asphalt concrete pavement0.210.280.32
cement concrete pavement0.230.310.33

Figure 12

Permafrost table of embankment under cement concrete pavement"

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