Accumulated permanent strain and critical dynamic stress of frozen silty clay under cyclic loading

Wang, Jiahui; Xue, Ling; Li, Qionglin; Zhang, Feng; Li, Yan

doi:10.1016/j.coldregions.2018.05.007

Cited by 37 publications

(13 citation statements)

References 30 publications

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“…[7] differentiated, by conducting tests, three types of behavior in granular materials when these were subjected to numerous load cycles. Such behavior can be seen in Figure 2, separated by the plastic shakedown and creep limits [8]:…”

Section: Evolution Of Long-term Deformation Due To the Number Of Cyclesmentioning

confidence: 87%

“…Mathematical developments and the application of analytical expressions that could predict soil deterioration began with greater interest in roads [5] and, since then, have continued to develop with more interest in the current era due to the interest in build new infrastructure and buildings that are located in soils that experience unstable behavior in the medium to long term [4,8].…”

Section: Empirical-experimental Cumulative Modelsmentioning

confidence: 99%

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State of the Art: Deterioration Models of Railway Ballasts and Subgrades. Recommendations and Applications

Cambronero¹

2020

GJES

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In recent years, rail transport has experienced a great expansion throughout the world, becoming an efficient and competitive transportation system for countries that have thousands of kilometers of tracks. In the coming decades, we contemplate that new and ambitious railway projects will be developed, and the technical difficulties in the interaction with the environment, through which the track aims to circulate and reach greater speeds, make these projects a real challenge for civil engineering. Such are the cases of the expansion of the High-Speed network in China [1] and the expected development of high-speed lines in the UnitedWith respect to high-speed networks, the demographic and economic growth of many of the countries that have a rail network with these characteristics with optimal exploitation conditions and study experience has forced the networks to reach higher speeds to meet the demand and/or economic objectives that are required of this transportation system. The increase in speed could generate an increase in the values of the loads that are transmitted to the railway platform, since the speed is proportional to the value of the loads. This proportion is related to the effect of the weight of the nonsuspense masses of the train, since if this weight does not change but the value of the speed increases, the dynamic effects that occur in the vehicle-track interaction cause this interaction to generate a dynamic overload that increases the value of the loads to be supported by the track. In terms of railway freight transport, the future commercial expansion of several countries can lead to trains having to increase their load and/or transport capacity, either by increasing the number of cars or the axle load that is transmitted to the railway platform [3], thus considering the adaptation of this

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Section: Evolution Of Long-term Deformation Due To the Number Of Cyclesmentioning

confidence: 87%

Section: Empirical-experimental Cumulative Modelsmentioning

confidence: 99%

State of the Art: Deterioration Models of Railway Ballasts and Subgrades. Recommendations and Applications

Cambronero¹

2020

GJES

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“…As stated in the Code for Testing Dynamic Properties of Foundations (GB/T 50269-2015), a stress value corresponding to a CPS of 5% of soil samples was selected as the dynamic strength. The loading frequency selected was 2 Hz like in some other research [42,43,46,47]. prepared with a maximum dry density of 2.14 g/cm3 with reference to that of NSF, and a water content of 12.2% (8.2% + 4%); the sum of the optimum water content and hydration reaction required water.…”

Section: Freeze-thaw Cycle and Loading Processmentioning

confidence: 99%

A Contrast Analysis of Deformation Characteristics and Critical Dynamic Stress of Natural and Fiber-Binder Reinforced Subgrade Filler after Different Freeze-Thaw Cycles

Wang

Ling

et al. 2023

Materials

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To investigate the dynamic stability of natural subgrade filler (NSF) and fiber-binder reinforced subgrade filler (RSF) under cyclic load after freeze–thaw (FT) cycles, a triaxial test was conducted to determine the correlation between cumulative plastic strain (CPS) and the quantity of loading cycles, as well as the evolution law of dynamic strength and critical dynamic stress (CDS) with different FT cycles. The CPS change in the NSF and RSF shows three states (stable, critical, and destructive) with increasing vibration times. However, both fillers have different failure forms, and the curve shapes of the CPS with loading cycle quantities before and after failure are also different. With the number of FT cycles increasing, the requisite dynamic stress threshold for NSF specimen failure decreases continuously. After three FT cycles, the anti-cumulative deformation ability of the NSF decreases by approximately 32%. The anti-cumulative deformation abilities of the NSF after seven and nine FT cycles, respectively, are similar. The amelioration measures could significantly enhance the FT resistance of the NSF. After zero, one, three, five, seven, and nine FT cycles, the requisite dynamic stress threshold for the RSF to reach destruction is increased 1.52, 1.89, 1.98, 2.32, 2.2, and 2.45 times, respectively, compared to that of the NSF. A mechanical model of critical dynamic stress of the NSF and RSF that considers the FT cycle was obtained using a multivariate nonlinear regression method.

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“…Frost et al [ 26 ] presented that the σ cri of fine-grained subgrades is approximately half of the deviator stress corresponding to static destruction. Wang et al [ 27 ] reported that the initial stress state could considerably affect the σ cri of a silty clay. Recently, a few empirical models were developed to predict the σ cri ; Zhang et al [ 28 ] developed a regression model for predicting the σ cri based on the fuzzy linear regression theory and structural element method.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Critical Dynamic Stress and Accumulative Plastic Strain of an Unbound Granular Material Based on Cyclic Triaxial Tests

et al. 2021

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Critical dynamic stress (σcri) and accumulative plastic strain (εp) are primary indicators regarding the dynamic stability of unbound granular materials (UGMs). This study aims to seek an effective method to evaluate the dynamic stability of UGMs used in railway subgrades. First, the dynamic characteristics of an UGM used in railway subgrade bed construction were investigated by performing a series of large-scale cyclic triaxial tests, with the results showing that εp versus cycle number (N) curves can be categorized into stable, failure, and critical patterns. Grey relational analyses were then established, where the analyzed results demonstrated that the εp–N curve pattern and final accumulative plastic strain (εs) of the stable curves are strongly correlated with the moisture content (w), confining pressure (σ3), and dynamic deviator stress (σd). The analyzed grey relational grades distributed in a narrow range of 0.72 to 0.81, indicating that w, σ3, and σd have similar degrees of importance on determining the εp–N curve patterns and the values of εs of the UGM. Finally, a data processing method using a back-propagation (BP) neural network is introduced to analyze the test data, and an empirical approach is developed to evaluate the σcri (considering the effects of σ3 and w) and εs (considering the effects of σ3, w, and σd) of the UGM. The analyzed results illustrated that the developed method can effectively reflect the linear/non-linear relationships of σcri and εs with respect to σ3 and/or σd. The σcri approximately increases linearly with increasing σ3, and a simple empirical formula is proposed for the σcri. In addition, εs and its variation rate increase non-linearly with increasing σd but decrease non-linearly as σ3 increases.

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Accumulated permanent strain and critical dynamic stress of frozen silty clay under cyclic loading

Cited by 37 publications

References 30 publications

State of the Art: Deterioration Models of Railway Ballasts and Subgrades. Recommendations and Applications

State of the Art: Deterioration Models of Railway Ballasts and Subgrades. Recommendations and Applications

A Contrast Analysis of Deformation Characteristics and Critical Dynamic Stress of Natural and Fiber-Binder Reinforced Subgrade Filler after Different Freeze-Thaw Cycles

Evaluation of Critical Dynamic Stress and Accumulative Plastic Strain of an Unbound Granular Material Based on Cyclic Triaxial Tests

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