Thermal monitoring of frozen wall thawing after artificial ground freezing: Case study of Petrikov Potash Mine

Levin, L. Yu.; Golovatyi, Ivan; Av, Zaĭtsev; Pugin, A.V.; Семин, М. А.

doi:10.1016/j.tust.2020.103685

Cited by 34 publications

(13 citation statements)

References 28 publications

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“…The freezing temperatures were set to −10, −20 and −30 • C, respectively. After 48 h of freezing, the specimens were melted at 20 • C. Based on the temperature variation measured by Levin et al [7], the melting time was set to 48 h. Finally, all samples of group A and groups B, C, and D after freezing-thawing were subjected to triaxial loading. 2 is a damage diagram of quasi-sandstone after thawing for various freezing temperatures.…”

Section: Testing Schemementioning

confidence: 99%

“…However, when the fissure water of a rock mass freezes after freezing of the mining shaft, the volume expansion of joint filling is constrained by the surrounding rock mass, resulting in a frost-heaving force [6]. The temperature of the frozen walls changes with time and space in the process of wellbore construction [7][8][9]. The decrease in temperature will increase the frost-heaving pressure [10], resulting in irreversible damage, such as an increase of rock porosity [11].…”

Section: Introductionmentioning

confidence: 99%

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Triaxial Compression Fracture Characteristics and Constitutive Model of Frozen–Thawed Fissured Quasi-Sandstone

et al. 2022

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The artificial frozen wall crossing the water-rich sand layer is prone to failure during thawing. To study the loading fracture characteristics and damage evolution of single-fissured sandstone after thawing, quasi-sandstones with prefabricated single fissure at different angles were prepared using the sandstone of the Luohe Formation as the original rock to conduct freeze–thaw tests with various temperature differences, and triaxial compression tests were performed on the samples. Based on the distribution theory of rock micro-element strength and static elastic modulus, a damage constitutive model of single-fissured quasi-sandstone under freezing–thawing and confining pressure was established. The results show that with the decrease in freezing temperature, the amount of flake spalling on the sample surface increases, and the frost-heaving cracks of quasi-sandstone become more numerous and longer, which makes the single-fissured quasi-sandstone tend to have a more complex tensile–shear hybrid failure than a shear failure. Moreover, with the increase in fissure angle, the absolute value of the freezing temperature required to produce frost-heaving cracks increases. An S-shaped damage evolution curve corresponds to each stage of triaxial compression of single-fissured quasi-sandstone. With the decrease in freezing temperature, the strength of rock after thawing decreases, and the brittleness characteristics strengthen.

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Section: Testing Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Triaxial Compression Fracture Characteristics and Constitutive Model of Frozen–Thawed Fissured Quasi-Sandstone

et al. 2022

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“…In this case, assumptions are often made about the absence of latent heat of the phase transition of moisture in the soil and the stationarity of heat transfer processes. Numerical methods for calculating heat transfer in 2D [11,12] and 3D [13][14][15] are also used. They are most common today in the practice of building mine shafts.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Temperature Anomalies during Thermal Monitoring of Frozen Wall Formation

Семин

Golovatyi²,

Pugin

2021

Fluids

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The paper describes a distributed temperature sensing system that was used to monitor the artificial freezing of soils during the construction of a potash mine shaft. The technique of reconstructing the temperature field by solving the inverse problem in the entire volume of frozen soils using the measured temperatures in four thermal monitoring (TM) wells is described. Two local anomalies in temperature distributions in TM wells are described and analyzed theoretically using thermo-hydraulic modeling. The first anomaly concerns the asymmetric temperature distribution in one of the soil layers and is associated with the influence of natural groundwater flow in the horizontal direction. The second anomaly consists of a sharp decrease in water temperature in the section of the TM well located inside the freezing contour. Calculations showed that it is most likely associated with the entry of cold groundwater from the overlying layers of soils through a well filter at a depth of 160 m and the subsequent movement of the water up the well.

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“…To construct tunnels and mine shafts under hard hydrogeological conditions some activities for soil reinforcement have to be conducted. Artificial Ground Freezing (AGF) is an effective engineering technique which enables to prevent failure of an excavation and its water flooding [1]. A decrease in ground temperature leads to freezing of pore water and generating ice crystals which improve strength and stiffness properties of the freezing ground and obstruct a water flow in the pore space.…”

mentioning

confidence: 99%

Numerical Simulation of Coupled Thermo-Hydro-Mechanical Processes in Freezing Soils

Zhelnin¹,

Kostina²,

Plekhov³

et al. 2021

14th WCCM-ECCOMAS Congress

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In the study a thermo-hydro-mechanical model of freezing of saturated soil is presented, with focus on numerical simulation of artificial ground freezing (AGF). Artificial freezing of saturated soils induces such process in the soils as water migration, frost heave and consolidation which can have an effect on the freezing process and surrounding areas. To take into account the important from geotechnical point of view processes the thermo-hydromechanical model was developed. The model is based on the fundamental balance equations of continuum media mechanics. The Clausius-Clapeyron equation and constitutive relations of poromechanics are used for describing a relationship between pore pressure, temperature, stress and strain fields. Also an inelastic strain is included accounting for an effect of frost heave. The equations of the model were implemented in Comsol Multiphysics® software and solved using the finite element method relative to variables of porosity temperature and displacement. Numerical simulation of artificial freezing of a soil stratum for a vertical shaft sinking was carried out. A mesh convergence of numerical solution was analyzed. Results of the simulation have shown the model enables to describe a frozen wall formation with a coupled change of porosity, water pore pressure, volumetric strain and mean stress.

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Thermal monitoring of frozen wall thawing after artificial ground freezing: Case study of Petrikov Potash Mine

Cited by 34 publications

References 28 publications

Triaxial Compression Fracture Characteristics and Constitutive Model of Frozen–Thawed Fissured Quasi-Sandstone

Triaxial Compression Fracture Characteristics and Constitutive Model of Frozen–Thawed Fissured Quasi-Sandstone

Analysis of Temperature Anomalies during Thermal Monitoring of Frozen Wall Formation

Numerical Simulation of Coupled Thermo-Hydro-Mechanical Processes in Freezing Soils

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