Determination of the critical dynamic stress for airport subgrade based on the serviceable performance

Yu, Lei; Zhang, Sheng; Ye, Xinyu; Xuan, Mingmin; Liu, Xizhong

doi:10.1016/j.trgeo.2022.100832

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…To the analysis of the confining pressure of silt at the field subgrade depth of 1- 5 m, the confining pressure of soil is approximately in the range of 30–90 kPa according to the code [ 21 ] (MH/T 5010-2017), which considering the thickness of the pavement structure and the bulk density of the silt in the subgrade. The confining pressure of 60 kPa was used to investigate the plastic strain development law of the silt in the literature [ 22 ]. In this paper, the same confining pressure of 60 kPa was selected to qualitatively study the dynamic characteristics of the salinized silt in the subgrade.…”

Section: Soil Properties and Test Schemementioning

confidence: 99%

Study on dynamic characteristics of salinized silt under cyclic loading

Wu,

Kou,

Xuan

et al. 2024

PLoS ONE

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Under the repeated action of aircraft taxiing load, the subgrade plastic deformation becomes the key factor affecting the service performance of the airfields when salinized silt is used to fill the subgrade. In this study, the dynamic triaxial tests were carried out on a region in the northern part of China to study the effects of different salt contents on the dynamic characteristics of silt under cyclic loading. A prediction model for the salinized silt dynamic strength with a plastic strain of 4% as the failure criterion for the subgrade was thus proposed. It is found that with the increase of dynamic stress amplitude, the salinized silt plastic deformation transforms gradually from plastic deformation to incremental failure. The salt contents significantly influence the plastic strain and critical dynamic stress of silt. The strength of the salinized silt specimen is related to the ion concentration in the soil pores and the arrangement pattern of soil particles, as indicated by the progressive strength increase of the salinized silt at the low salt content of 1% and a further gradual decrease at high salt content.

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Section: Soil Properties and Test Schemementioning

confidence: 99%

Study on dynamic characteristics of salinized silt under cyclic loading

Wu,

Kou,

Xuan

et al. 2024

PLoS ONE

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“…It is classified as sandy-silty soil. methods, including the study of critical dynamic stresses [20] and the prediction of deformation [21].…”

Section: Properties Of Soil Samplesmentioning

confidence: 99%

“…Lv [19] explored the macroscopic physical properties of Hangzhou silty soil and their relationship with the microstructure through the SEM tests on silty soil samples. In addition, studies have been carried out on the effect of dynamic properties caused by different sample preparation methods, including the study of critical dynamic stresses [20] and the prediction of deformation [21].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence Mechanism of Sample Preparation Method on the Shear Strength of Silty Soil

Qian²,

Xuan

et al. 2023

Sustainability

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During the compaction of silty soil subgrade, different filling methods are adopted, which will significantly impact the subgrade performance, but few studies have been applied to quantify this influence. To explore the influence mechanism of dry density and sample preparation method (compaction and static compression method) on the shear strength of silty soil, the consolidated undrained shear test (CU test), dynamic triaxial test, and nuclear magnetic resonance microscopic test on silty soil were carried out in this study. The test results show that the shear strength of the sample is positively correlated with the dry density. The influence of the sample preparation method on shear strength is mainly reflected in the cohesion. The pore size distributions obtained by different sample preparation methods had smaller differences before the CU test. However, significant differences were observed after the CU test, indicating that the influence of the sample preparation method on the shear strength of the sample is not on the initial pore distribution but on the residual stress and overall uniformity. The dynamic triaxial tests show that a differential settlement may occur when multiple sample preparation (soil-filling method in subgrade practice) methods are adopted.

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