Study on Cold Resistance Performance of Composite Subgrade Structure in Seasonal Frozen Regions

Han, Leilei; Wei, Haibin; Zhang, Yong; Zhang, Ji; Wang, Fuyu

doi:10.3390/app10134681

Cited by 7 publications

(3 citation statements)

References 20 publications

(10 reference statements)

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“…The monitoring points of A 1 , B 1 , and C 1 were directly above the right tube, and the monitoring points of A 2 , B 2 , and C 2 were directly above the left tube. According to the existing literature [30] and to experience, the freezing depth in Changchun area is about 1.7 m below the ground. In order to reduce the effect of seasonal frost heaving, the rebar should be inserted below the frost line.…”

Section: Methodsmentioning

confidence: 99%

Investigation on Response of Site of Typical Soil–Rock Composite Strata in Changchun Induced by Shield Construction of Parallel Twin Tunnels

Li,

Yao

2024

Applied Sciences

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Underground engineering construction will inevitably change the stress state of surrounding strata, which will force a negative impact on the surrounding environment, even leading to the large deformation and damage of some adjacent structures. With a focus on the deformation of a typical soil–rock composite stratum site in the construction of Changchun Metro, relying on the shield construction of a parallel twin tunnel project between Northeast Normal University Station and Gong-Nong Square Station, which belongs to the Changchun Metro Line 1, the site deformation characteristics during the shield driving process of parallel twin tunnels were studied. Based on the data obtained from field monitoring and numerical simulation, ground settlement in shield driving was analyzed, the settlement trough was studied with the Peck formula, and the action of shield driving on the adjacent tunnel was discussed. Moreover, the influence range of shield driving was suggested, and the interaction between the twin tunnels with different axis spacings in shield driving was discussed. Some regular results obtained can provide support through data for similar projects in Changchun, China.

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Section: Methodsmentioning

confidence: 99%

Investigation on Response of Site of Typical Soil–Rock Composite Strata in Changchun Induced by Shield Construction of Parallel Twin Tunnels

Li,

Yao

2024

Applied Sciences

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“…This leads to the pavement structure being very prone to folding, cracking, and various other issues, which seriously affect the safety, comfort, and durability of the highway [6,7]. Roadbeds in cold regions are even more susceptible to damage of road pavements due to cyclic temperature changes during the freezing and thawing process [8,9].As shown in Table 1, scholars around the world have studied the mechanical properties and deformation mechanism of railway roadbeds in cold regions, and have made certain academic achievements [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Highway Subgrade in Cold Regions under Different Conditions

Wang,

Li,

Jia

et al. 2024

Applied Sciences

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In order to study the changes in the mechanical properties of road subgrade in cold areas after the freezing and thawing of highways in cold areas, indoor mechanical tests were carried out to investigate the effects of the number of freeze–thaw cycles, freezing temperature, water content, and circumferential pressure on the mechanical properties of road subgrade soil in cold areas after thawing. The mechanical properties of road subgrade soil in cold areas after thawing were measured under different conditions. The test results show that, within the study range: (1) After 7 freeze–thaw cycles, the destructive stress of the subgrade soil decreased from 321.7 kPa to 289.9 kPa, a decrease of 9.9%, and the elastic modulus decayed by 19.9%. (2) When the freezing temperature was reduced from −5 °C to −15 °C, the destructive stress of the subgrade soil decreased from 303.9 kPa to 290.1 kPa, a decrease of 13.8 kPa, approximately 4.5%, and the decrease in modulus of elasticity was about 1.6%. (3) The water content increased from 6% to 12%, and the destructive stress decreased from 405.43 kPa to 288.4 kPa, a decrease of 29.1%, and the modulus of elasticity decreased approximately linearly, with an attenuation of 50.4%. (4) The peripheral pressure increased from 50 kPa to 150 kPa, and the destructive stress increased from 194.7 kPa to 367.7 kPa, a growth of 88.8%, and its modulus of elasticity increased with the increase in peripheral pressure, an increase of 154.1%. The results of this research can provide a reference for highway and engineering construction in the western silt–soil distribution area.

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“…As shown in Table 1, although domestic and foreign scholars have done a lot of research on the mechanical properties and deformation mechanism of railway subgrade in cold regions, and have made some academic achievements (12)(13)(14)(15). However, there are few studies on highway subgrade in cold regions, especially on the mechanics and deformation mechanism of thawed soil after freeze-thaw cycles.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on mechanical properties of subgrade soil in cold region under different conditions

Wang,

Li,

Jia

et al. 2023

Preprint

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In order to study the change of mechanical properties of subgrade under the condition of thawing after the highway in cold region is subjected to freeze-thaw action all the year round. In this paper, the effects of freeze-thaw cycles, freezing temperature, water content and confining pressure on the mechanical properties of subgrade soil in cold regions after thawing were studied by carrying out indoor mechanical tests, and the mechanical properties of subgrade soil in cold regions after thawing under different conditions were measured. The test results show that : 1 ) after 7 freeze-thaw cycles, the failure stress of subgrade soil decreases from 321.7 kPa to 289.9 kPa, with a decrease of 9.9%, and the elastic modulus decreases by 19.9%. 2 ) When the freezing temperature is reduced from − 5°C to − 15°C, the failure stress of subgrade soil is reduced from 303.9 kPa to 290.1 kPa, which is reduced by 13.8 kPa. The reduction range is about 4.5%, and the elastic modulus is about 1.6%;3 ) When the water content increased from 6–12%, the failure stress decreased from 405.43 kPa to 288.4 kPa, with a decrease of 29.1%, and the elastic modulus decreased approximately linearly, with a decrease of 50.4%. 4 ) When the confining pressure increases from 50 kPa to 150 kPa, the failure stress increases from 194.7 kPa to 367.7 kPa, and the failure stress increases by 88.8%. The elastic modulus increases by 154.1% with the increase of confining pressure. The research results can provide reference for highway and engineering construction in the western silty sand distribution area.

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Study on Cold Resistance Performance of Composite Subgrade Structure in Seasonal Frozen Regions

Cited by 7 publications

References 20 publications

Investigation on Response of Site of Typical Soil–Rock Composite Strata in Changchun Induced by Shield Construction of Parallel Twin Tunnels

Investigation on Response of Site of Typical Soil–Rock Composite Strata in Changchun Induced by Shield Construction of Parallel Twin Tunnels

Experimental Study on Mechanical Properties of Highway Subgrade in Cold Regions under Different Conditions

Experimental study on mechanical properties of subgrade soil in cold region under different conditions

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