Dynamic Mechanical Behavior and Numerical Simulation of Frozen Soil under Impact Loading

Zhang, Dan; Zhu, Zhiwu; Liu, Zhijie

doi:10.1155/2016/3049097

Cited by 12 publications

(11 citation statements)

References 8 publications

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“…It shows an obvious segmental character and can be divided into four stages: nonlinear compaction stage, linear elastic stage, plastic development stage, and rapid failure stage. is type of sandstone shows obvious initial nonlinear compaction characteristics in statics [19][20][21]. However, the proportion of the nonlinear compression segment is very small in the dynamics, which is basically not shown in the stress-strain curves.…”

Section: Stress-strain Curve Analysismentioning

confidence: 99%

“…Furthermore, Xie et al [20] built a micromechanical constitutive model to describe the dynamic compressive deformation of frozen soil and proved the model well reflects the experimental results of frozen soil at different high strain rates and temperatures. Zhang et al [21] analyzed the dynamic mechanical properties of frozen soil based on HJC constitutive model and used LS-DYNA to simulate the results. According to the dynamic mechanical properties of marble treated at different high temperatures, Wang [22] established a damage evolution equation considering the temperature effect and strain rate effect, which combined the damage theory and strain equivalence principle.…”

Section: Introductionmentioning

confidence: 99%

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Study on Dynamic Constitutive Model of Weakly Consolidated Soft Rock in Western China

Wang

Qin

et al. 2020

Shock and Vibration

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To obtain the impact mechanical response and establish the dynamic damage constitutive relationship of frozen sandstone at low temperature conditions, the impact test of Cretaceous red sandstone under different temperatures was conducted using a split Hopkinson pressure bar (SHPB) device. According to the characteristics of the stress-strain curves obtained by the test, a constitutive model considering the damage effect, temperature effect, and strain rate effect was established, which was improved by Zhu–Wang–Tang (Z–W–T) constitutive model. It was proved that the fitting curves of constitutive equation were in good agreement with the test curves. The fluctuation amplitude of fitting error was controlled within ±4 MPa. The physical meaning of each parameter of the constitutive model is clear, and most of them are fixed values. The selection range of variable parameters and the related change rules are confirmed, which improves the practicability of constitutive model. The constitutive equation can well describe the nonlinear features of this kind of frozen sandstone under impact loading. It was also found that the constitutive equation was applicable to express the dynamic mechanical properties of rock-like materials such as hard rock, soft rock, frozen soil, raw coal, and concrete. It can be referred to the parameter determination method in this paper to study and determine the parameters, reduce the difficulty of parameter selection, and improve the practicability of the constitutive model and parameters, so as to guide the engineering practice better.

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Section: Stress-strain Curve Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Constitutive Model of Weakly Consolidated Soft Rock in Western China

Wang

Qin

et al. 2020

Shock and Vibration

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“…Similarly, in order to take the temperature effect into consideration, a temperature softening factor can be added. Zhang et al. (2012) conducted a series of tests on frozen soil under uniaxial impact and claimed that the relation between peak stress and temperature is linear; thus, a linear form can be applied where t , tr, and tm are the actual temperature, reference temperature, and melting point of ice, respectively, and n is the temperature softening coefficient.…”

Section: Dynamic Constitutive Modelmentioning

confidence: 99%

“…Similarly, in order to take the temperature effect into consideration, a temperature softening factor can be added. Zhang et al (2012) conducted a series of tests on frozen soil under uniaxial impact and claimed that the relation between peak stress and temperature is linear; thus, a linear form can be applied…”

Section: Dynamic Constitutive Modelmentioning

confidence: 99%

A constitutive model for frozen soil based on rate-dependent damage evolution

Cao

Zhu

et al. 2017

International Journal of Damage Mechanics

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The deformation of frozen soil under impact loading is usually accompanied by the evolution of internal defects and microdamage. By taking the strain and strain rates into account, a rate-dependent damage evolution law is proposed in this study, under the assumption of equivalent strain. Subsequently, a damage-modified rate-dependent constitutive model is proposed to describe the dynamic mechanical properties of frozen soil. A split Hopkinson pressure bar is utilized to test the dynamic mechanical response of frozen soil at different temperatures and high strain rates. The experimental results show that frozen soil produces obvious strain rate and temperature effects, and that there is a linear relationship between the peak stress and temperature. The theoretical results of the proposed constitutive model agree well with the experimental results, verifying the applicability of the model.

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“…e literature [18][19][20][21] studied the temperature effect, strain rate effect, the destruction process, and energy transfer characteristics of different types of soil under freezing. e law of dynamic mechanical parameters of a coal specimen changing from room temperature to a negative temperature was analyzed by Wang et al [22], and the coal-rock stress-strain curve characteristics subject to the low-temperature-impact loading coupling effect were discussed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Dynamic Mechanics Characteristics of Saturated Marble under Low Temperature

Yang

Wang

2021

Shock and Vibration

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The effect of low temperature on dynamic mechanical properties of low-temperature frozen marble at a high strain rate was studied by a dynamic impact test. The influence of temperature changes (25°C–40°C), especially negative temperature changes, on dynamic strength, peak strain, and failure mode of the marble was analyzed. Combined with the fracture morphology, the reasons for the deterioration of dynamic mechanical strength of water-saturated marble at lower negative temperatures were investigated. The experimental results show that the dynamic mechanical properties of marble are significantly affected by the change of freezing temperature. The dynamic strength firstly decreases and then increases with the decrease of temperature in the range of 25°C to −20°C, but the dynamic strength decreases sharply after −20°C. The peak strain increases first, then decreases, and then increases, and the inflection point temperature of the change is −5°C and −20°C, respectively, which is completely different from the static load test results of frozen rock at low temperature. According to fracture morphology analysis, water-ice phase transformation at −5°C leads to the nucleation and expansion of a large number of microcracks and micropores in marble, and the interaction between slip separation cracks and microstructures caused by shear deformation under impact separates the massive crystals inside the rock into microscopic crystals, thus reducing the bearing capacity and strength of marble. From −5°C to −20°C, the ice medium and marble matrix contract when cooled, and the microcracks and micropores caused by the phase transition gradually close during the contraction process, the integrity of the rock is restored, and the dynamic strength of the rock is increased. At −20°C, there is a great difference in the shrinkage rate of the marble matrix and the ice medium, and the internal microstructure increases. Meanwhile, the impact amplifies the brittleness of the rock at low temperatures, leading to a sharp decrease in the dynamic strength of the marble.

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Dynamic Mechanical Behavior and Numerical Simulation of Frozen Soil under Impact Loading

Cited by 12 publications

References 8 publications

Study on Dynamic Constitutive Model of Weakly Consolidated Soft Rock in Western China

Study on Dynamic Constitutive Model of Weakly Consolidated Soft Rock in Western China

A constitutive model for frozen soil based on rate-dependent damage evolution

Experimental Study of Dynamic Mechanics Characteristics of Saturated Marble under Low Temperature

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