A unified viscoplastic model and strain rate–temperature equivalence of frozen soil under impact loading

Zhang, Fulai; Zhu, Zhiwu; Ma, Wei; Zhou, Zhiwei; Fu, Tiantian

doi:10.1016/j.jmps.2021.104413

Cited by 32 publications

(18 citation statements)

References 43 publications

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“…The temperature field generated by the temperature rise causes the phase transition between ice and water and the change of ice content, thus affecting the mechanical properties of permafrost 44 , 45 . Zhang et al 46 proposed the strain rate- temperature equivalence of permafrost by regression analysis of test data, and used the damage caused by adiabatic temperature rise to describe the thermal softening effect of permafrost under impact load, and proposed the damage evolution model of permafrost. In order to minimize the influence of the temperature field generated by the temperature rise on the test results of the bearing capacity of the pile foundation, the test pile head should be reinforced and the pre-strike of the excitation equipment should be carried out before the formal high-strain test.…”

Section: Test Principle and Methodsmentioning

confidence: 99%

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

Yu,

Cao,

Zhao

2023

Sci Rep

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The high-strain dynamic test method possesses the attributes of speed, efficiency, and environmentally-friendly, low-carbon characteristics. To study the reliability of the high-strain dynamic test method in detecting the bearing capacity of pile foundation in permafrost regions, 4 test piles, each with a length of 15 m and a diameter of 1.0 m, were poured based on the actual bridge construction project in the permafrost region of Daxing'an Mountains in China. Based on the temperature data between the piles and soil, the refreezing state of the pile foundation was comprehensively judged. Subsequently, the static method was employed to assess the friction resistance values and single pile bearing capacity of each soil layer on the pile side under different freezing states before and after the pile foundation refreezing. Building upon these findings, the restrictive parameters for soil elastic limit $$q_{(i)}$$ q ( i ) , soil resistance $$R_{U} (i)$$ R U ( i ) and other parameters in the pile-soil model of high-strain dynamic test method are clarified. The test and analysis results indicate that under the condition that the ground temperature of frozen soil is about − 1.9 °C, the pile-soil refreezing takes about 120 days, and the pile-soil refreezing is a slow process; In CAPWAPC calculation program, after the values of soil parameters were constrained by the results of static-load test, the calculated curve is in satisfactory agreement with the measured curve, and the parameters of the pile-soil model are reliable, which can be used for the rapid detection of the ultimate bearing capacity of piles in permafrost regions; In the process of pile-soil refreezing, the change of temperature field affects the freezing strength between pile and soil, the process of pile-soil refreezing is positively correlated with the increase of pile foundation bearing capacity.

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Section: Test Principle and Methodsmentioning

confidence: 99%

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

Yu,

Cao,

Zhao

2023

Sci Rep

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“…The incident bar and transmission bar were 7075-T6 aluminum alloys, whose elastic modulus, Poisson’s ratio, and density were 71 GPa, 0.3, and 2810 kg/m 3 , respectively (Fu et al., 2019a). In accordance with Zhang et al. (2021), a wedge with high stiffness and a copper sheet were added in the experiment as a pulse shaper, which can not only generate incident waves with high amplitudes and long rising edges but also protect the end of the incident bar.…”

Section: Methodsmentioning

confidence: 99%

“…(2018b) proposed a dilation law to explain the evolution in the volume dilation of frozen silty clay with a change in accumulation of plastic shear strain. In terms of impact loading studies, Zhang et al. (2021) established an equivalence relation between the strain rate and temperature based on the thermal activation theory and built a unified viscoplastic constitutive model with heat-related damage to describe the nonlinear strain hardening and strain softening of frozen soil.…”

Section: Introductionmentioning

confidence: 99%

“…From long-term cyclic triaxial tests on frozen silty clay, Li et al (2018b) proposed a dilation law to explain the evolution in the volume dilation of frozen silty clay with a change in accumulation of plastic shear strain. In terms of impact loading studies, Zhang et al (2021) established an equivalence relation between the strain rate and temperature based on the thermal activation theory and built a unified viscoplastic constitutive model with heat-related damage to describe the nonlinear strain hardening and strain softening of frozen soil. Based on the homogenization theory, Fu et al (2021) built a mesoscopic damage model of unsaturated frozen soil that can precisely reflect the mechanical damage, strain rate, and temperature effects of frozen soil subjected to impact loading.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation research on impact mechanical properties of frozen soil based on discrete element method

Chunyu

Zhu

et al. 2022

International Journal of Damage Mechanics

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Many engineering activities have been conducted on permafrost. Frozen soil is subjected to impact loading, particularly during blasting and excavation projects. Thus, it is essential to study the impact mechanical properties of frozen soil. A split Hopkinson pressure bar (SHPB) experiment was conducted to investigate the mechanical responses of frozen soil specimens subjected to impact loading under different strain rates at different temperatures. Evident strain rate and temperature effects were also observed. As crack development in the specimens could not be observed experimentally, a two-dimensional particle flow code was utilized to numerically simulate SHPB impact experiments on frozen soil. A contact bonding model was used for the simulation. We assumed that only temperature could change the particle parameters. The parameters and establishment of the geometric model in the simulation were calibrated and validated by comparing them with the experimentally obtained impact stress–strain curves and wave signals. More influences of strain rate and temperature on crack development were presented intuitively in this study, in combination with the propagation of stress waves. The results of the numerical simulation demonstrated that when the frozen soil specimen was subjected to impact loading, shear failure was the primary failure in the specimen. For a given temperature, a lower strain rate decreased the number of cracks generated, increased the duration of crack generation, and delayed the formation of cracks. For a given strain rate, a lower temperature decreased the number of cracks generated and the duration of crack generation; however, the number of tensile cracks was negligibly affected by changes in temperature.

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“…Relevant research on materials under high impact loading conditions has generally used split Hopkinson pressure bar (SHPB) devices (Chen and Song, 2011;Chunyu et al, 2022;Fu et al, 2019;Leclair et al, 1999;Li et al, 2023;Long et al, 2022;Shangguan et al, 2020;Tao et al, 2023;Yu et al, 2023;Zhao et al, 2022). Researchers have conducted detailed investigations of impact dynamic constitutive models through damage mechanics (Cao et al, 2017;Zhang et al, 2021;Zhu et al, 2019Zhu et al, , 2020, macroscopic-mesoscopic mechanics (Xie et al, 2016;Zhu et al, 2018), and energy characteristic theories (Ma et al, 2021;Shangguan et al, 2020). Zhu et al (2018) studied the evolution equation of the damage mechanism of microcracks and the influence of soil particle size and they established a macroscopic-mesoscopic constitutive model of frozen soil.…”

Section: Introductionmentioning

confidence: 99%

Dynamic constitutive model of saturated saline frozen soil under uniaxial impact loading

Shang,

Zhu,

et al. 2024

International Journal of Damage Mechanics

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The soil matrix, salt crystals, ice crystals, and pore solutions constitute the composite geological material of saturated saline frozen soil. The destruction mode and dynamic constitutive model of saturated saline frozen soil need to be studied because infrastructure construction is increasingly being extended to regions with saturated saline frozen soil. Based on the split Hopkinson pressure bar device, uniaxial impact compression tests were conducted on frozen soil samples with different salt contents under different strain rates. The strain rate of saturated saline frozen soil must be emphasized based on the results. The gradient of the elastic segment and maximum stress of the soil are negatively correlated with the salt content increase. To further explore the failure mechanism, the study examined the damage and failure behavior of saturated saline frozen soil, along with the absorption energy in the failure process. According to the test results, the saturated saline frozen soil was similar to a particle-reinforced composite. Subsequently, the debonding damage of the ice–salt eutectic and the mechanical–chemical damage of the soil matrix were considered. The test results could be predicted accurately from the results of the model, verifying that the influences of the salt content and strain rate are reasonably considered by the constructed model.

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A unified viscoplastic model and strain rate–temperature equivalence of frozen soil under impact loading

Cited by 32 publications

References 43 publications

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method

Numerical simulation research on impact mechanical properties of frozen soil based on discrete element method

Dynamic constitutive model of saturated saline frozen soil under uniaxial impact loading

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