Dynamic behaviors of coarse granular aggregates in high-speed railway subgrades

Zhang, Fei; Wang, Tianliang; Bu, Jianqing; Yin, Zhaoai

doi:10.1016/j.soildyn.2021.107046

Cited by 14 publications

(2 citation statements)

References 15 publications

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“…In this paper, the axial dynamic strain of the specimen reached 5% is selected as the failure standard 26,39,43,44 Eq. ( 7) actually reflects the influence of d E to d  .…”

Section: Dynamic Elastic Modulus Edmentioning

confidence: 99%

Dynamic elasticity modulus of weathered red sandstone soil subject to drying-wetting cycles

Yun-ye

2023

Preprint

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The drying-wetting cycles has a significant effect on the dynamic behavior of the weathered red sandstone soil. A series of the unconsolidated undrained dynamic triaxial tests were conducted on the weathered red sandstone soil samples under different numbers of drying-wetting cycles N, and the hysteresis curves and dynamic backbone curves were obtained under different confining pressures σ3. A hyperbolic model of dynamic backbone curve based on Hardin-Drnevich model was proposed, and the regression expressions between the parameters of the proposed model and N were presented. The relation between the maximum dynamic elasticity modulus Edmax and N, σ3 was analyzed based on the proposed hyperbolic model. The fitting equation of dynamic elasticity modulus Ed and dynamic stress σd was put forward, and the relation between dynamic elasticity modulus Ed and N was studied. The main conclusions from this work as follows: (1) Hardin-Drnevich model can well express the hyperbolic behaviors of dynamic backbone curves of the weathered red sandstone soil. The proposed hyperbolic model and the expressions of Edmax and Ed can well reflect the influences of the numbers of drying-wetting cycles and σ3 on Edmax and Ed respectively. (2) Edmax and Ed increase with the increase of σ3 under certain N; and decrease with N under a certain σ3. (3) Ed of the weathered red sandstone soil increases non-linearly with the increase of dynamic strain εd. The introduced factor β can quantitatively reflects the influences of N on Edmax .

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“…In this paper, the axial dynamic strain of the specimen reached 5% is selected as the failure standard 26,39,43,44 Eq. ( 7) actually reflects the influence of d E to d  .…”

Section: Dynamic Elastic Modulus Edmentioning

confidence: 99%

Dynamic elasticity modulus of weathered red sandstone soil subject to drying-wetting cycles

Yun-ye

2023

Preprint

View full text Add to dashboard Cite

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“…Mei et al [13] studied the influences of confining pressure and stress level on the deformation behavior of coarse-grained soil. Zhang et al [14] used the power function model, which considers the effect of dynamic and confining stresses, to describe the accumulative plastic strain development of coarse granular aggregates. In addition to power law models, other models have also been documented to describe the accumulative deformation behavior of coarse-grained soil.…”

Section: Introductionmentioning

confidence: 99%

Accumulative Plastic Deformation of the Improved Completely Weathered Granite Subgrade in High-Speed Railway

Zhao

Wang

et al. 2022

Advances in Materials Science and Engineering

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The improvement and reuse of completely weathered granite (CWG) with poor engineering properties for backfilling embankments can help protect the environment and bring great economic benefits. The embankment of high-speed railways demands an extremely low additional subgrade settlement under long-term dynamic loads. To analyze the applicability of the improved CWG used for subgrade filling, a series of laboratory dynamic triaxial and field cyclic loading tests were carried out. On the basis of the test results, a calculation model of accumulative plastic strain considering the dynamic stress ratio and the cement content was established. Using the proposed model and the numerically calculated dynamic stress, the accumulative plastic deformation of an embankment filled with improved CWG under various driving conditions was calculated and discussed. The variation of accumulative plastic deformation of the improved CWG with loading cycles could be described by a power function. The dynamic stress level had a significant influence on the accumulative plastic strain, and the strain in the bottom layer of the subgrade bed was greatly attenuated. Accordingly, most of the accumulative plastic deformation attenuation occurred within the depth range of the subgrade bed. The final total accumulative plastic deformations of the embankment were less than 2 mm (5 mm for the limit value) after 4 million times of high-speed train loadings, proving that the improved CWG can be used for subgrade filling. The influence of the axle load on accumulative plastic deformation was more significant than that of the train speed. The proposed calculation model of the accumulative plastic strain could provide valuable reference for similar railway engineering.

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Study on the effects of drying–wetting cycles on the dynamic elasticity modulus of weathered red sandstone soil

Deng

2023

SN Appl. Sci.

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In this paper, the effect of drying–wetting cycles on the dynamic elasticity modulus of weathered red sandstone soil was studied based on a series of unconsolidated undrained dynamic triaxial tests under different confining pressures and with the help of the Hardin–Drnevich model. The main results from this work as follows: (1) Hardin–Drnevich model can well express the hyperbolic behaviors of dynamic backbone curves of the weathered red sandstone soil exposed to drying–wetting cycles. (2) Both the maximum dynamic elasticity modulus and the dynamic elastic modulus of the weathered red sandstone soil decreased linearly with numbers of drying–wetting cycles under a certain confining pressure. The dynamic elasticity modulus decreased non-linearly with the increase of dynamic strain. (3) The maximum dynamic elastic modulus of the weathered red sandstone soil decreased by 19.62% to 70.91%, 21.16% to 71.07%, and 29.53% to 77.36%, respectively after 3 to 12 drying–wetting cycles under confining pressures of 100, 200, and 300 kPa. The rate at which the maximum dynamic elastic modulus decreases is basically the same under different confining pressures.

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Dynamic behaviors of coarse granular aggregates in high-speed railway subgrades

Cited by 14 publications

References 15 publications

Dynamic elasticity modulus of weathered red sandstone soil subject to drying-wetting cycles

Dynamic elasticity modulus of weathered red sandstone soil subject to drying-wetting cycles

Accumulative Plastic Deformation of the Improved Completely Weathered Granite Subgrade in High-Speed Railway

Study on the effects of drying–wetting cycles on the dynamic elasticity modulus of weathered red sandstone soil

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