Analytical study of the dynamic response of a double-beam model for a geosynthetic-reinforced embankment under traffic loads

Zhang, Ling; Ou, Qiang; Zhou, Shuai

doi:10.1016/j.compgeo.2019.103330

Cited by 39 publications

(6 citation statements)

References 44 publications

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“…The cyclic loading adopted a square wave load at a load frequency of 2 Hz considering the typical range of load frequency in transportation [ 37 , 38 , 39 ]. The dynamic load had load levels of 0.2, 0.5 and 0.8, the same as the static loading tests.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

2022

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Cement-based lightweight materials have received much attention recently in embankment backfill applications, the boundary of which is more close to a plane strain condition. To study the influence of plane strain condition on the behavior and void structure of cement-based lightweight material under cyclic loading, this paper conducted a series of compression tests on foamed cement pastes with densities of 700 and 900 kg/m3 subjected to static and cyclic loading under plane strain conditions. The X-CT technique was adopted to obtain the three-dimensional (3-D) void structures of the specimens before and after the loading tests. The results showed that the plane strain conditions yielded specimen compression strengths 30–50% higher than the unconfined conditions. The specimen integrity endured under load levels of less than 0.5, but failed after approximately 1000 cycles under a load level of 0.8, indicating that cyclic loading could accelerate the degradation of the specimena. The void structures of the specimens showed that the void volumes were featured bfatured an unimodal distribution with unimodal positions in a range of 0.1–0.2 mm3. The unimodal position became higher with the increasing cyclic load level. Slices of the specimens after static and cyclic loading tests suggested that cyclic load could easily lead to the rupture of voids that then merge into bigger voids and the connection of voids forming cracks.

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Section: Methodsmentioning

confidence: 99%

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

2022

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“…For simplicity, the outputs of the present study are obtained considering identical soil stiffness. Following equations are used for calculating soil stiffness, shear parameter and damping coefficients 30 – 32 . where E s and B are the Young’s modulus of soil and width of the beam respectively, γ is the rate at which the vertical displacement in the ground diminishes with depth, ν s and ξ are the Poisson’s ratio of soil and damping ratio respectively.…”

Section: Problem Definitionmentioning

confidence: 99%

Section: Problem Definitionmentioning

confidence: 99%

“…Adopting the similar concept of beam-spring model Wu et al 27 and Chaudhuri and Choudhury 28 examined the dynamic behaviour of buried pipe subjected to surface and subsurface blast loads respectively. Further, Zhang et al 29 , 30 investigated the response of pavement structure on geocell reinforced embankment under vehicle loads (concentrated loads and moving load respectively) using double beam model. As per the author’s knowledge closed-form analytical study on pipe below road pavement with and without intermediate safeguard is not available in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Protection of pipeline below pavement subjected to traffic induced dynamic response

Chaudhuri

Choudhury

2023

Sci Rep

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Failure of pipelines below road pavement results to the disruption of both the traffic movement and the consumers of the pipelines. Intermediate safeguard layer can be used to protect the pipeline from heavy traffic loads. The present study proposed analytical solutions to obtain the dynamic response of buried pipe below road pavement with and without considering safeguard based on the concept of triple and double beam system respectively. Pavement layer, safeguard and the pipeline are considered as Euler Bernoulli’s beam. Advanced soil model is used (viscoelastic foundation with shear interaction between springs) to model the surrounding soil. Self-weight of soil is also considered in the present study. The obtained governing coupled differential equations are solved adopting finite sine Fourier transform, Laplace transform and their inverse transformation. The proposed formulation is initially verified with the past numerical and analytical studies and then validated with the three-dimensional finite element based numerical analysis. From parametric study it is perceived that the stability of the pipe can be significantly increased by providing intermediate barrier. Further, pipe deformation is increases with increasing traffic loads. At very high-speed range (> 60 m s−1), pipe deformation is significantly rises with increasing traffic speed. The present study can be useful in preliminary design stage before performing rigorous and expensive numerical or experimental study.

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“…e deformation control of a deep braced excavation is significant for ensuring excavation stability, reducing construction costs, and protecting nearby structures and facilities. In engineering practice, the commonly adopted measures for controlling deformation of excavation are as (1) increasing the embedded depth of the retaining wall; (2) installing walls or piles between excavation and nearby structures [45,46]; (3) ground improvement; and (4) zoned and staged construction. Moreover, a simple review of the literature as presented in the above sections has indicated that soil creep can induce additional lateral wall deflections, ground surface settlements, and basal heaves.…”

Section: Countermeasures For Mitigating Detrimental Effect Of Soilmentioning

confidence: 99%

Soil Creep Effect on Time-Dependent Deformation of Deep Braced Excavation

Guo

Lei

Luo

et al. 2022

Advances in Materials Science and Engineering

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This paper describes recent advances in the effect of soil creep on the time-dependent deformation of deep braced excavation. The effect of soil creep is generally investigated using the observational method and the plain-strain numerical simulation method. The observational method is more applicable for deep braced excavations in soft clays constructed using the top-down method. The plain-strain numerical simulation method can be conveniently used for parametric analysis, but it is unable to capture the spatial characteristics of soil creep effect on lateral wall deflections and ground movements. The additional lateral wall deflections and ground movements that are generated due to the soil creep effect can account for as large as 30% of the total displacements, which highlights the importance of considering the effect of soil creep in deep braced excavations through soft clays. The magnitude of the displacements due to soil creep depends on various factors, such as excavation depth, elapsed period, unsupported length, and strut stiffness. Parametric analyses have indicated several effective measures that can be taken in practice to mitigate the detrimental effect of soil creep on the deformation of deep braced excavation. Based on the literature review, potential directions of the related future research work are discussed. This paper should be beneficial for both researchers and engineers focusing on mitigating the adverse effect of soil creep on the stability of deep braced excavations.

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Analytical study of the dynamic response of a double-beam model for a geosynthetic-reinforced embankment under traffic loads

Cited by 39 publications

References 44 publications

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

Mechanical Performance and Void Structure Change of Foamed Cement Paste Subjected to Static and Cyclic Loading under Plane Strain Conditions

Protection of pipeline below pavement subjected to traffic induced dynamic response

Soil Creep Effect on Time-Dependent Deformation of Deep Braced Excavation

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