Full-scale model study on variations of soil stress in geosynthetic-reinforced pile-supported track bed with water level change and cyclic loading

Wang, Hanlin; Chen, Ren Peng; Cheng, Wei; Qi, Suitao; Cui, Yu Jun

doi:10.1139/cgj-2017-0689

Cited by 62 publications

(8 citation statements)

References 32 publications

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“…3). The deviator stress amplitude Δq is defined as the difference value between the maximum deviator stress qmax and the minimum deviator stress qmin [40,41,42,43]. A frequency of 1.78 Hz corresponding to a low train speed of 50 km/h was chosen, aiming to guarantee the quality of controlling the pre-defined loading shape.…”

Section: Cyclic Triaxial Testsmentioning

confidence: 99%

Investigation of the parallel gradation method based on the response of track-bed materials under cyclic loadings

Cui

Dupla

et al. 2020

Transportation Geotechnics

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Ballast/fines mixture is often found in railway substructure and the overall behaviour of tracks is strongly dependent on the mechanical behaviour of this mixture. Since directly testing such mixture with large grains is limited with common laboratory equipment, the consideration of a model material at smaller size is advisable. Parallel gradation method is widely used for this purpose. This study assesses the validity of this method in the case of ballast/fines mixture. Large-scale cyclic triaxial tests were carried out on the ballast/fines mixture at six volumetric coarse grain contents. The results obtained were analysed, together with those obtained previously from small-scale triaxial tests on a microballast/fines mixture whose microballast grain size distribution was determined by applying the parallel gradation method. The cyclic parameters (permanent strain and resilient modulus) were obtained for the two types of mixture. Results show that for all mixtures two distinct soil fabrics can be identified according to the variations of permanent strain and resilient modulus with the volumetric content of coarse grains fv: a fine-fine contact structure for fv ≤ 20% and a grain-grain contact structure for fv ≥ 35%. In the case of fine-fine contact structure, the permanent strains and resilient modulus values of the ballast specimens are consistent with those of the microballast specimens, evidencing the validity of the parallel gradation method. In the case of grain-grain contact structure, the permanent strains and resilient modulus values are found to coincide globally at the two scales, also justifying the validity of the parallel gradation method, the slight differences between the two scales being attributed to the irregular grain sliding and the 3 distribution of the fines soils.

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Section: Cyclic Triaxial Testsmentioning

confidence: 99%

Investigation of the parallel gradation method based on the response of track-bed materials under cyclic loadings

Cui

Dupla

et al. 2020

Transportation Geotechnics

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“…In the field of geotechnical and geological engineering contents such as piled foundations, geosynthetic-reinforced structures, soil nailing projects and retaining walls, the soil-structure interaction plays a key role in the long-term performance of these constructed facilities (Abu-Farsakh et al 2007;Zhou and Yin 2008;Yin and Zhou 2009;Zhou et al 2011;Anubhav and Basudhar 2013;Chen et al 2013;Qian et al 2013;Zhou et al 2013;Arulrajah et al 2014;Divya et al 2014;Venkateswarlu et al 2018;Wang et al 2018a;Goodarzi and Shahnazari 2019;Wang and Chen 2019;Wang et al 2019aWang et al , 2019bWang et al , 2019c. Among the mechanical behaviors for the soil-structure interface, assessing the shearing behavior is of paramount importance, which thus attracts increasing attentions from researchers in the recent decades.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size Distribution of Sandy Soil on Shearing Behaviors at Soil–Structure Interface

Wang

Zhou²,

Yin

et al. 2019

J. Mater. Civ. Eng.

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For the geotechnical construction and maintenance, assessing the shearing behavior at the soil-structure interface is significant. This study presents an experimental investigation about the effect of the grain size distribution of a sandy soil on the shearing behaviors at the soil-structure interface, using a modified direct shear apparatus. Five soil samples with different coefficients of uniformity were prepared.The normalized roughness of the structure surface (the ratio between the maximum roughness of the structure plate and the mean grain size of the soil), the relative density, the maximum, the mean and the minimum grain sizes of all samples were controlled the same. During the tests, the shear force, the shear displacement and the vertical displacement were monitored. The results show that at a given shear displacement and normal stress, the sample with lower coefficient of uniformity Cu presents higher shear stress and more pronounced dilative behavior. The increase of Cu leads to the decrease of the friction angle for the soil-structure interface (at both peak and ultimate states) and the decrease of the maximum vertical deformation of the soil sample during the shearing process. As Cu increases, the main force chain at the soil-structure interface turns from the contact between the coarser grains to that mainly formed by the finer grains, resulting in the decrease of the shearing resistance. In comparison with the previous relevant studies, the decreasing trend of the friction angle with the increase of Cu is strongly supported.

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“…Wang et al [122] performed a full-scale model analysis of soil stress variations in a geosynthetic-reinforced piled railway foundation at varying water levels and loading cycles. A schematic diagram of this model is illustrated in Figure 14.…”

Section: Selected Applications In Practice and Challenges Facedmentioning

confidence: 99%

A Critical Review on the Performance of Pile-Supported Rail Embankments under Cyclic Loading: Numerical Modeling Approach

et al. 2021

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Searching for economical and practical solutions to increase any transport substructure’s protection and stability is critical for ensuring the long-term viability and adequate load-bearing capacity. Piles are increasingly being used as an economical and environmentally sustainable solution to enhance the strength of soft subgrade soils on which embankments are raised. As per the available literature, there are two main strategies used to explain railway embankments’ performance: experimental approaches and numerical simulations on a broad scale. The purpose of this study is to examine the state-of-the-art literature on numerical modeling methods adopted to assess the performance of pile-supported rail embankments subjected to cyclic loading. The paper addresses the main results from various numerical methods to explain the appropriate mechanisms associated with the load deformation response. It also presents the key issues and drawbacks of these numerical methods concerning rail embankment development while outlining the specific shortcomings and research gaps relevant to enhanced future design and analysis.

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Full-scale model study on variations of soil stress in geosynthetic-reinforced pile-supported track bed with water level change and cyclic loading

Cited by 62 publications

References 32 publications

Investigation of the parallel gradation method based on the response of track-bed materials under cyclic loadings

Investigation of the parallel gradation method based on the response of track-bed materials under cyclic loadings

Effect of Grain Size Distribution of Sandy Soil on Shearing Behaviors at Soil–Structure Interface

A Critical Review on the Performance of Pile-Supported Rail Embankments under Cyclic Loading: Numerical Modeling Approach

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