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Sciences in Cold and Arid Regions ›› 2021, Vol. 13 ›› Issue (5): 366-371.doi: 10.3724/SP.J.1226.2021.21029.

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Rationale for creation of capillary breaking layers in cold regions subgrade by pressure injection of waterproofing compounds

D. A. Razuvaev,A. L. Lanis,M. G. Chakhlov()   

  1. Siberian Transport University, Dusi Koval'chuk Street, 191, Novosibirsk 630049, Russian
  • Received:2021-04-25 Accepted:2021-07-21 Online:2021-10-31 Published:2021-12-03
  • Contact: M. G. Chakhlov E-mail:mik404@mail.ru

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Abstract:

In the presents work, the authors have carried out a field study of moisture transfer processes in highway subgrades in a cold region during freezing and laboratory experiments on freezing samples of silicified soils used as a capillary barrier. The study showed that the creation of a capillary barrier from an injected solution, blocking the access of groundwater to the freezing zone, will reduce the amount of heaving to permissible values. Based on the results of laboratory studies, an exponential dependence of the relative deformation due to frost heaving on the relative height of soil silicatization in the freezing zone has been established. For creating a capillary barrier in the already existing subgrade, the authors have proposed designs of injection-silicified soils and substantiated the use of such soils.

Key words: capillary barrier, subgrade, soil injection, silicified soil, cold regions

Figure 1

Methods to combat the destruction of pavement by frost heaving"

Figure 2

The investigated road sections. (a) Road section No. 1 with deep groundwater ("closed" freezing); (b) road section No. 2 with a high groundwater level ("open" freezing)"

Figure 3

Sampling of soil from study road sections using a hand drill (d=40 mm)"

Figure 4

Drilling holes in the subgrade(a) road section No. 1 with deep groundwater ("closed" freezing); (b) road section No. 2 with shallow groundwater ("open" freezing)"

Figure 5

The established dependences of the relative humidity of the soil (W/WL) with depth under the pavement in autumn and spring. (a) road section No. 1 with deep groundwater ("closed" freezing); (b) road section No. 2 with shallow groundwater ("open" freezing) 1 the beginning of soil freezing period (November); 2 the period of soil freezing to the maximum depth (March)"

Figure 6

Generalized CBS designs (a) for embankments; (b) for depressions 1 axes of injectors; 2 elements of the capillary breaking screen; 3 embankment base; 4 groundwater level (GWL)"

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