Present situation and prospect of mechanical research on frozen soils in China

Lai, Yuanming; Xu, Xingkai; Dong, Yuanhong; Li, Shuangyang

doi:10.1016/j.coldregions.2012.12.001

Cited by 146 publications

(36 citation statements)

References 13 publications

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“…With the engineering structures constructed, the pre-existing hydrothermal balance of natural foundation has been seriously disturbed. Coupled with frequent freeze-thaw cycles, the thermal imbalance of engineering structures will lead to uneven degradation of the underlying permafrost, then resulting in different degrees of engineering diseases [2][3][4][5]. Thermal conductivity is a prime influence factor of permafrost response to the external thermal disturbance and also a determining parameter of the freeze-thaw circle, which governs the unsteady heat-transfer process of soil [7,8].…”

Section: Research Significancementioning

confidence: 99%

“…A rammed soil foundation is a widely utilized construction and building foundation type in permafrost regions and its thermal response to external heat disturbance determines the stability and sustainability of engineering applications to a certain extent [1,2]. Due to the temperature sensitivity of frozen soil, the mechanical properties differ greatly before and after freezing and thawing, which tends to induce various engineering diseases characterized by thaw settlement and frost heave [3]. Thermal conductivity is one of the most important parameters of frozen soil, which is also a prime influencing factor of engineering structural damage caused by thaw settlement and frost heave [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Test and Prediction Model of Soil Thermal Conductivity in Permafrost Regions

et al. 2020

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Soil thermal conductivity is a dominant parameter of an unsteady heat-transfer process, which further influences the stability and sustainability of engineering applications in permafrost regions. In this work, a laboratory test for massive specimens is performed to reveal the distribution characteristics and the parameter-influencing mechanisms of soil thermal conductivity along the Qinghai–Tibet Engineering Corridor (QTEC). Based on the measurement data of 638 unfrozen and 860 frozen soil specimens, binary fitting, radial basis function (RBF) neural network and ternary fitting (for frozen soils) prediction models of soil thermal conductivity have been developed and compared. The results demonstrate that, (1) particle size and intrinsic heat-conducting capacity of the soil skeleton have a significant influence on the soil thermal conductivity, and the typical specimens in the QTEC can be classified as three clusters according to their thermal conductivity probability distribution and water-holding capacity; (2) dry density as well as water content sometimes does not have a strong positive correlation with thermal conductivity of natural soil samples, especially for multiple soil types and complex compositions; (3) both the RBF neural network method and ternary fitting method have favorable prediction accuracy and a wide application range. The maximum determination coefficient (R2) and quantitative proportion of relative error within ±10% ( P ± 10 % ) of each prediction model reaches up to 0.82, 0.88, 81.4% and 74.5%, respectively. Furthermore, because the ternary fitting method can only be used for frozen soils, the RBF neural network method is considered the optimal approach among all three prediction methods. This study can contribute to the construction and maintenance of engineering applications in permafrost regions.

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Section: Research Significancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Test and Prediction Model of Soil Thermal Conductivity in Permafrost Regions

et al. 2020

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“…Currently, besides a series of formulations that have been proposed for describing the mechanical behaviour of frozen ground and permafrost subjected to uniaxial loads (Zhu and Carbee, 1987;Zhu et al, 1992), long-term loads (Goughnour and Andersland, 1968;Ladanyi, 1972;Sayles, 1973;Fish, 1983Fish, , 1984Zhu and Carbee, 1983;Gardner et al, 1984;Cai et al, 1990;Domaschuk et al, 1991;Wijeweera and Joshi, 1991;Miao et al, 1995;He et al, 2000;Yang et al, 2004;Wang et al, 2006Wang et al, , 2014, and evolutionary thermal fields (Arenson and Springman, 2005b;Li et al, 2009;Yang et al, 2010) with the consideration of a number of associated problems (Nishimura et al, 2009;Thomas et al, 2010;Zhang and Michalowski, 2015;Zhang et al, 2016), models for capturing the effects of confining loads have been presented Lai et al, 2009Lai et al, , 2010Lai et al, , 2013Lai et al, , 2016Yang et al, 2010;Li et al, 2010;. However, when attempting to capture the highly nonlinear mechanical behaviour of frozen ground and permafrost under variations of confining pressure, there is the main issue of needing to use complex mathematical formulations that rely on many material parameters.…”

Section: Introductionmentioning

confidence: 97%

A non-linear constitutive model for describing the mechanical behaviour of frozen ground and permafrost

Loria

Frigo

Chiaia

2017

Cold Regions Science and Technology

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“…Permafrost and seasonal permafrost cover about 50% of the Earth's land area, mainly in Russia, Canada, China, the United States, Alaska, and Northern Europe. China has a wide cold area (Figure 1(a)), with permafrost and seasonal frozen-soil area accounting for more than 70% of the total region [6][7][8]. Rock and soil mass are affected by freeze-thaw cycles year-round in the seasonal frozen-soil area, and superstructure stability and safety are directly influenced by temperature changes during the freeze-thaw process [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Unloading Creep of Tuffaceous Sandstone in East Tianshan Tunnel under Freeze-Thaw Cycles

Zhou

Zhan

et al. 2019

Advances in Materials Science and Engineering

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e physicomechanical properties of tunnel surrounding rock are influenced by many factors such as the external environment and freeze-thaw cycles, especially in engineering in high cold regions. To understand the characteristics of freeze-thaw cycles on the creep properties of rocks in high cold regions, a freeze-thaw test, SEM test, triaxial compression test, and triaxial unloading creep test were carried out for tuffaceous sandstone in the G575 East Tianshan Tunnel in Hami, Xinjiang. e results show the following: (1) the freeze-thaw cycle reduces the degree of cementation of mineral particles in a microcosm, manifested on a macro scale by the scaling mode and crack propagation mode; (2) the effect of freeze-thaw cycles reduces the compressive strength and shear strength of rock samples (i.e., ductility enhancement); (3) for tuffaceous sandstone, the unloading process and freeze-thaw cycle each lead to improved creep deformation in rock samples, and radial deformation is more sensitive to rock deformation and failure; and (4) the creep rate of surrounding rock can be reduced by confining pressure. e peak creep rate increased with freezethaw time, as did the overall creep rate. Attention should be paid to deformation within a short period, and necessary supporting and protection measures should be taken to reduce creep.

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Present situation and prospect of mechanical research on frozen soils in China

Cited by 146 publications

References 13 publications

Experimental Test and Prediction Model of Soil Thermal Conductivity in Permafrost Regions

Experimental Test and Prediction Model of Soil Thermal Conductivity in Permafrost Regions

A non-linear constitutive model for describing the mechanical behaviour of frozen ground and permafrost

Characteristics of Unloading Creep of Tuffaceous Sandstone in East Tianshan Tunnel under Freeze-Thaw Cycles

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