scholarly journals TO THE DEFINITION OF DEFORMATION CHARACTERISTICS OF SOILS IN TERMS OF SEASONAL FREEZING AND THAWING

2016 ◽  
Vol 3 (2) ◽  
pp. 87-89
Author(s):  
Александра Мащенко ◽  
Aleksandra Mashchenko
Keyword(s):  
Physical Characteristics ◽  
Clay Soils ◽  
Deformation Characteristics ◽  
Freezing And Thawing ◽  
Seasonal Freezing ◽  
Deformation Properties ◽  
Frozen Clay ◽  
Definition Of

The article presents the method of determining the deformation properties of soils thaw as well as results of the physical characteristics of frozen clay soils and silty sands. The results of the coefficient of compressibility and thawing during thawing soils are given. The article presents the methods for improvement of deformation properties of soils. Keywords: coefficient of thawing, compressibility when thawing, clay soils, silty sands, reinforcement

scholarly journals Influence of low temperatures on aggregate disruption of heavy clay soils

2010 ◽  
Vol 58 (2) ◽  
pp. 161-168 ◽  
Author(s):  
Jana Kozlovsky Dufková
Keyword(s):  
Wind Erosion ◽  
Freeze Drying ◽  
Soil Aggregates ◽  
Early Spring ◽  
Clay Soils ◽  
Late Winter ◽  
Freezing And Thawing ◽  
Heavy Clay ◽  
Frozen Clay ◽  
Erodible Fraction

Heavy clay soils that are normally resistant to wind erosion, from study site Ostrožská Nová Ves si­tua­ted in the foothills of the Bílé Karpaty Mountains, Czech Republic, were a subject of laboratory analyses. The analyses should found out the influence of overwinter processes on disruption of soil aggregates and thus reason of vulnerability to soil loss by wind. Two overwinter processes were observed – freezing and thawing, and freeze-drying of the soil. Both processes have indicated the increasing of erodible fraction in dependence of water content of analysed soils. Exposed frozen clay soils that freeze-dries during the winter in the foothills of Bílé Karpaty, leaves soils highly erodible in late winter and early spring.

scholarly journals Experimental Study on the Creep Behavior of Red Sandstone under Low Temperatures

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Yongjun Song ◽  
Leitao Zhang ◽  
Huimin Yang ◽  
Jianxi Ren ◽  
Yongxin Che
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Deformation Characteristics ◽  
Red Sandstone ◽  
Rock Samples ◽  
Uniaxial Creep ◽  
Deformation Properties ◽  
Accelerated Creep ◽  
Different Temperatures

In cold regions, the deformation characteristics and long-term mechanical properties of rocks under low-temperature conditions are considerably different from those in other regions. To study the deformation characteristics and long-term mechanical properties of rocks in a low-temperature environment and the effect of different temperatures, we perform a multilevel loading-unloading uniaxial creep test on red sandstone samples and obtain the creep curves at different temperatures (20°C, −10°C, and −20°C). The results demonstrate that the total strain at each temperature can be divided into instantaneous and creep strains; the instantaneous strain includes instantaneous elastic and plastic strains, and the creep strain includes viscoelastic and viscoplastic strains. Temperature has a significant effect on the deformation properties of red sandstone. A decrease in temperature reduces the instantaneous and creep deformations of the rocks at all levels of stress. In addition, a decrease in temperature exponentially attenuates the total creep and viscoplastic strains of the rocks. 0°C is a critical point for the reduction of the total creep and viscoplastic strains of the rocks. When the temperature is greater than 0°C, the total creep and viscoplastic strains of the rocks decrease rapidly and linearly with decrease in temperature; however, when the temperature is less than 0°C, the decrease in the total creep and viscoplastic strains of the rocks is slow. The steady-state creep rate of the rock samples decreases with decrease in temperature, whereas the creep duration increases with decrease in temperature, especially in the case of the accelerated creep stage. The accelerated creep durations of the rock samples S4 (20°C) and S7 (–10°C) are 0.07 h and 0.23 h, respectively.

scholarly journals Dielectric constants of deep frozen clay soils of Longgu mine (0.1∼1GHz)

2009 ◽  
Vol 1 (1) ◽  
pp. 519-523 ◽  
Author(s):  
Song Lei ◽  
Zhang Xiao-jun ◽  
Li Hai-peng
Keyword(s):  
Dielectric Constants ◽  
Clay Soils ◽  
Frozen Clay
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