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Dynamic Mechanical Properties and Energy Dissipation Characteristics of frozen soil Under Passive Confined Pressure

Acta Mechanica Solida Sinica 2021年第2期34卷 184-203页

作者： Jinxuan Jia Huaiping Tang Huijian Chen Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Impact compression tests on frozen soil samples with different freezing temperatures and subjected to passive confined pressure were performed using a split Hopkinson pressure bar at different loading strain *** three-dimensional stress-strain curves of the frozen soil samples under the corresponding conditions were *** experimental results showed that,when the frozen soil was loaded to its elastic limit,shear failure occurred,the bearing capacity of pore ice was lost,and the thawed soil functioned as the main stress-bearing ***,the capacity of frozen soil to withstand hydrostatic pressure continued to *** dynamic mechanical properties of the frozen soil under passive confined pressure were observed to be strongly related to the loading strain rate and freezing *** the loading strain rate increased,the secant modulus,elastic modulus,and strength(including the shear strength)of the frozen soil increased,whereas its Poisson^ratio and coefficient of lateral pressure *** the freezing temperature decreased,the secant modulus,elastic modulus,and shear strength of the frozen soil increased;however,its Poisson5s ratio and coefficient of lateral pressure *** the frozen soil was subjected to impact loading under passive confined pressure,energy dissipation occurred due to plastic deformation,mesoscopic damage evolution,and ice-water phase *** shear failure occurred,the absorption energy per unit volume of frozen soil increased as the freezing temperature decreased and the loading strain rate increased.

关键词： frozen soil Split Hopkinson pressure bar Passive confined pressure Dynamic mechanical properties Energy dissipation

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Dynamic Deformation of frozen soil at a High Strain Rate:Experiments and Damage-Coupled Constitutive Model

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Acta Mechanica Solida Sinica 2021年第6期34卷 895-910页

作者： Z.W.Zhu W.R.Tang G.Z.Kang Applied Mechanics and Structural Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu610036China Northwest institute of Eco-Environment and Resources State Key Laboratory of Frozen Soil EngineeringChinese Academy of SciencesLanzhou730000China

The dynamic compressive deformation of frozen soil was investigated by conducting the split-Hopkinson pressure bar(SHPB)experiments at three temperatures and different high strain rates,and the dynamic stress–strain responses and failure modes of the frozen soil were *** experimental results demonstrate that the frozen soil exhibits evident dependence on the strain rate and temperature under the dynamic loading *** dynamic compressive stress–strain curve of the frozen soil was divided into three parts:the linear,nonlinear rising,and strain softening *** nonlinear rising and strain softening parts were both caused by the damage attributed to the debonding between the ice particles and soil matrix,from which a rate-dependent damage evolution equation was ***,a damage-coupled dynamic viscoelastic constitutive model of frozen soil at high strain rate was derived.A comparison between the theoretically predicted results and the experimental ones showed that the developed dynamic viscoelastic model could well describe the dynamic mechanical behavior of frozen soil at high strain rate.

关键词： frozen soil Dynamic compression High strain rate Damage Constitutive model

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A Dynamic Micromechanical Constitutive Model for frozen soil under Impact Loading

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Acta Mechanica Solida Sinica 2016年第1期29卷 13-21页

作者： Qijun Xie Zhiwu Zhu Guozheng Kang School of Mechanics and Engeering Southwest Jiaotong University State Key Laboratory of frozen soil Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academic Sciences State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

By taking the frozen soil as a particle-reinforced composite material which consists of clay soil （i.e., the matrix） and ice particles, a micromechanical constitutive model is established to describe the dynamic compressive deformation of frozen soil. The proposed model is constructed by referring to the debonding damage theory of composite materials, and addresses the effects of strain rate and temperature on the dynamic compressive deformation of frozen soil. The proposed model is verified through comparison of the predictions with the corresponding dynamic experimental data of frozen soil obtained from the split Hopkinson pressure bar （SHPB） tests at different high strain rates and temperatures. It is shown that the predictions agree well with the experimental results.

关键词： frozen soil dynamic micromechanical model debonding damage theory SHPB

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Integrating MODIS LST and Sentinel-1 InSAR to monitor frozen soil deformation in the Qumalai-Zhiduo area, Qinghai-Tibet Plateau .

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International Journal of Digital Earth 2023年第1期16卷 1923-1943页

作者： Wenyan Yu Mi Jiang Xiao Cheng School of Geospatial Engineering and Science Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiPeople’s Republic of China Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University) Ministry of EducationZhuhaiPeople’s Republic of China

Owing to continuous global warming,frozen soil degradation has become a universal phenomenon,leading to large-scale ground deformation that affects engineering construction and the fragile ecological *** observations,especially temporal InSAR,can quantify ground ***,the accuracy of InSAR modelling in capturing the spatial–temporal variability of the freeze–thaw process depends on the spatial resolution of temperature *** paper proposes a freeze–thaw amplitude model incorporating MODIS LST based on a single-master InSAR time-series deformation to calculate frozen soil *** applied this model to the Qumalai-Zhiduo area of the Qinghai-Tibet Plateau and compared its results with those of the model using weather station temperature in terms of frozen soil deformation parameters,RSME,and characteristic *** study found that the model incorporating MODIS LST performed better in areas far from weather stations,while both models produced similar results in areas of close ***,we evaluated another commonly used method for calculating frozen soil deformation parameters and found that the method incorporating MODIS LST based on a single-master time-series deformation is more accurate and precise than the method based on a multi-master SBAS network.

关键词： InSAR deformation monitoring Qinghai Tibet plateau MODIS LST frozen soil

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Unified creep model of frozen soil under uniaxial compressive stress

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Progress in Natural Science:Materials International 1997年第1期7卷 65-69页

作者：盛煜吴紫汪苗丽娜马巍 China Chinese Academy of Sciences Lanzhou 730000 Lanzhou Institute of Glaciology and Geocryology State Key Laboratory of frozen soil Engineering

Due to the similarity of the creep curves of frozen soil, a unified model for the non-attenuation creep of the frozen soil under uniaxial stress is proposed, which is expressed by a normalized equation and some creep indexes. The normalized equation represents the natural rheological property of the frozen soil and is independent of the applied stress which affects only the creep indexes.

关键词： creep index frozen soil

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Mechanical behaviors of warm and ice-rich frozen soil stabilized with sulphoaluminate cement

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Journal of Mountain Science 2024年第1期21卷 335-345页

作者： WANG Honglei ZHANG Hu ZHANG Jianming ZHANG Qi YIN Zhenhua State Key Laboratory of frozen soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China School of Civil Engineering and Transportation Northeast Forestry UniversityHarbin 150040China National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment CCCC First Highway Consultants Co.LtdXi'an 710065China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China

The warm and ice-rich frozen soil is characterized by high unfrozen water content, low shear strength and large compressibility, which is unreliable to meet the stability requirements of engineering infrastructures and foundations in permafrost regions. In this study, a novel approach for stabilizing the warm and ice-rich frozen soil with sulphoaluminate cement was proposed based on chemical stabilization. The mechanical behaviors of the stabilized soil, such as strength and stress-strain relationship, were investigated through a series of triaxial compression tests conducted at -1.0℃, and the mechanism of strength variations of the stabilized soil was also explained based on scanning electron microscope test. The investigations indicated that the strength of stabilized soil to resist failure has been improved, and the linear Mohr-Coulomb criteria can accurately reflect the shear strength of stabilized soil under various applied confining pressure. The increase in both curing age and cement mixing ratio were favorable to the growth of cohesion and internal friction angle. More importantly, the strength improvement mechanism of the stabilized soil is attributed to the formation of structural skeleton and the generation of cementitious hydration products within itself. Therefore, the investigations conducted in this study provide valuable references for chemical stabilization of warm and ice-rich frozen ground, thereby providing a basis for in-situ ground improvement for reinforcing warm and ice-rich permafrost foundations by soil-cement column installation.

关键词： Permafrost regions frozen soil Mechanical behavior Chemical stabilization Ground improvement Ground modification

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Dynamic behavior of frozen soil under uniaxial strain and stress conditions

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Applied Mathematics and Mechanics(English Edition) 2013年第2期34卷 229-238页

作者：张海东朱志武宋顺成康国政宁建国 Traction Power State Key Laboratory Southwest Jiaotong University State Key Laboratory of frozen soil Engineering Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academic Sciences State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

The split Hopkinson pressure bar （SHPB） method is used to investigate the dynamic behavior of the artificial frozen soil under the nearly uniaxial strain and uniaxial stress conditions. The tests are conducted at the temperatures of -3 ℃, -8 ℃, -13℃, -17℃, -23℃, and -28℃ and with the strain rates from 900 s^-1 to 1500 s^-1. The nearly uniaxial stress-strain curves exhibit an elastic-plastic behavior, whereas the uniaxial stress-strain curves show a brittle behavior. The compressive strength of the frozen soil exhibits the positive strain rate and negative temperature sensitivity, and the final strain of the frozen soil shows the positive strain under the nearly uniaxial strain is greater rate sensitivity. The strength of the frozen soil than that under the uniaxial stress. After the negative confinement tests, the specimens are compressed, and the visible cracks are not observed. However, the specimens are catastrophically damaged after the uniaxial SHPB tests. A phenomenological model with the thermal sensitivity is established to describe the dynamic behavior of the confined frozen soil.

关键词： frozen soil dynamic loading split Hopkinson pressure bar (SHPB) con-finement high strain rate

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A rate-dependent constitutive model for saturated frozen soil considering local breakage mechanism

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2458-2474页

作者： Pan Wang Enlong Liu Bin Zhi Bingtang Song School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an710054China Northwest Institute of Eco-Environment and Resources State Key Laboratory of Frozen Soil EngineeringChinese Academy of SciencesLanzhou730000China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resources and HydropowerSichuan UniversityChengdu610065China

A rate-dependent constitutive model for saturated frozen soil is vital in frozen soil mechanics,especially when simultaneously describing the nonlinearity,dilatancy and strain-softening *** distribution of the non-uniform strain rate of saturated frozen soil at the meso-scale due to the local icecementation breakage is described by a newly binary-medium-based homogenization *** on the field-equation-based approach of the meso-mechanics theory,the interaction expression of the strain rate at macro-and meso-scale is derived,which can give the strain rate concentration tensor at different crushed *** the thermodynamics and empirical assumption,a breakage ratio in the rate-dependent form is *** overcomes the limitations of the existing binary-medium-based models that are difficult to simulate rate-dependent mechanical *** on these assumptions,a newly binary-medium-based rate-dependent model is proposed considering both the ice bond breakage and material composition characteristics of saturated frozen *** proposed constitutive model has been validated by the test results on frozen soils with different temperatures and strain rates.

关键词： Binary-medium-based model Rate-dependency frozen soil Grain debonding effect Multi-scale constitutive model

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A New Model for the Characterization of frozen soil and Related Latent Heat Effects for the Improvement of Ground Freezing Techniques and Its Experimental Verification

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Fluid Dynamics & Materials Processing 2019年第1期15卷 63-76页

作者： Daoming Shen Hua Si Jinhong Xia Shunqun Li Xinxiang University 191 Jinsui AvenueXinxiang453000China Tianjin Chengjian University 26 Jinjing RoadTianjin300384China

The correct determination of thermal parameters,such as thermal conductivity and specific heat of soil during freezing,is the most important and basic problem for the construction of an appropriate freezing *** this study,a calculation model of three stages of soil temperature was *** the unfrozen and frozen stages,the specific temperatures of dry soil,water,and ice are *** to the principle of superposition,a calculation model of unfrozen and frozen soils can be *** by a laboratory experiment,the latent heat of the adjacent zone was calculated for the freezing stage based on different water contents in the temperature *** the latent and specific heat of water,ice,and particles were calculated via superposition of the weight percentage content.A calculation model of the specific heat of the freezing stage was built,which provides both guidance and theoretical basis for the calculation of the specific heat of frozen soil.

关键词： Freezing construction latent heat frozen soil specific heat

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A Water-Heat-Force Coupled Framework for the Preparation of soils for Application in frozen soil Model Test

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Fluid Dynamics & Materials Processing 2021年第1期17卷 21-37页

作者： Daoming Shen Xia Zhang Jinhong Xia Shunqun Li College of Civil Engineering and Architecture Xinxiang UniversityXinxiang453000China School of Journalism and Communication Xinxiang UniversityXinxiang453000China College of Civil Engineering and Architecture Tianjin Chengjian UniversityTianjin300384China

The freezing of soil containing a liquid is a complex transient heat conduction problem involving phase change and release or absorption of latent *** efforts have essentially focused on theoretical research and numerical *** the present study,the problem is approached from an experimental point of view using the so-called“freezing model test”*** particular,in order to establish a precise relationship between the model and the prototype,a temperature similarity criterion is derived using the condition of an equal number of *** is also established with respect to other aspects.A similarity criterion for the water field is determined on the basis of relevant partial differential *** criteria for the stress field and load are derived using an elastic *** validity of this approach is experimentally *** research results provide a practical and reasonable method for calculating the parameters for preparing model *** also constitute a theoretical basis and a technical support for the design and implementation of a water-heat-force similarity coupled framework.

关键词： Latent heat frozen soil temperature field water-heat-force coupled framework

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