Abstract
This study uses a new sampling approach to allow undisturbed sampling without damaging the natural conditions of granular soils, thanks to the artificial ground freezing (AGF) method via a double-independent closed-circulation mechanism, over a 48-h period at − 15 °C. The mechanical properties, textural characteristics, and freezing-thawing observations of three types of granular soils are investigated. The temperature distribution around freezing pipes, the shape of the frost line, and the degree of ice saturation were observed through a thermal simulation by a two-dimensional finite element analysis software, Plaxis 2D. The unconfined compressive strength and strain values of molded and cored specimens are compared. The coring samples are about 2.56 times stronger than the molded ones, depending on the method of soil sampling procedure in the same type of soil. The well-graded sandy samples (SW) achieve up to 1.05 and 2.95 MPa of force values in the molded and coring samples, respectively. Moreover, according to the types of soils, in the SW specimens, 1.57- and 1.39-fold strength values are obtained for poorly graded sand (SP) and well-graded gravel (GW) samples in the molded artificially frozen sampling process, respectively, as well as 1.17- and 1.09-fold strength increments in the coring frozen sampling process within the same order. The results of thermal module simulation nearly match those obtained using laboratory-based tests. The efficiency of the proposed sampling approach has been proven to represent actual on-site behavior. Besides, the strength results are perfect in this method with respect to traditional sampling methods.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- C ice :
-
Specific heat capacity of ice (kJ/t/°K)
- C s :
-
Specific heat capacity of soil (kJ/t/°K)
- C water :
-
Specific heat capacity of water (kJ/t/°K)
- D 10 :
-
Effective particle size, 10% of the soil particles are finer than D10 size
- D 30 :
-
Effective particle size, 30% of the soil particles are finer than D30 size
- D 60 :
-
Effective particle size, 60% of the soil particles are finer than D60 size
- E f,inc :
-
Rate of change in Young’s modulus with temperature (kN/(m2°K))
- E f,ref :
-
Young’s modulus of frozen soil at a reference temperature (kN/m2)
- e 0 :
-
Initial void ratio (%)
- K 0 x ,0 z :
-
Unfrozen soil elastic compressibility coefficient in x and z directions
- K x :
-
Horizontal permeability (m/day)
- K y :
-
Vertical permeability (m/day)
- T water :
-
Water temperature (K)
- Ʋ f :
-
Poisson’s ratio of frozen soil
- w 0 :
-
Initial water content (%)
- w u :
-
Unfrozen water content (%)
- α ice :
-
Thermal expansion coefficient of ice (1/°K)
- α water :
-
Thermal expansion coefficient of water (1/°K)
- α x ,y,z :
-
Thermal expansion coefficient of soil in x, y, and z directions (1/°K)
- ɣ D :
-
Dense unit weight of soil (kN/m3)
- ɣ L :
-
Loose unit weight of soil (kN/m3)
- ɣ sat :
-
Saturated unit weight of soil (kN/m3)
- ɣ unsat :
-
Unsaturated unit weight of soil (kN/m3)
- ɣ water :
-
Unit weight of water (kN/m3)
- λ s :
-
Thermal conductivity of soil (kW/m/°K)
- λ ice :
-
Thermal conductivity of ice (kW/m/°K)
- λ water :
-
Thermal conductivity of water (kW/m/°K)
- ρ s :
-
Soil density (t/m3)
- Day:
-
Time
- K :
-
Temperature with Kelvin
- kJ :
-
Energy
- kN :
-
Force
- kw :
-
Power
- m :
-
Length
- m 2, m 3 :
-
Surface, volume
- t :
-
Mass
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Hani, M., Evirgen, B. A frozen soil sampling technique for granular soils and thermal modeling. Bull Eng Geol Environ 82, 354 (2023). https://doi.org/10.1007/s10064-023-03372-4
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DOI: https://doi.org/10.1007/s10064-023-03372-4