A combined method to predict the long-term settlements of roads on soft soil under cyclic traffic loadings

Cai, Yuanqiang; Chen, Yao; Cao, Zhigang; Ren, Chao

doi:10.1007/s11440-017-0616-3

Cited by 33 publications

(9 citation statements)

References 22 publications

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“…Subgrade consisting of saturated soft soil would be softened after it goes through million times of traffic loading in service [1,2]. Such mechanical feature would result in an additional roadway settlement and shortening the road serviceability life [3][4][5]. For example, Saga airport road built on Ariake clay in Japan suffered an astonishing settlement after it went into operation [6].…”

Section: Introductionmentioning

confidence: 99%

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Zhang

Chen

et al. 2020

Advances in Civil Engineering

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Resilient modulus of soil is crucial for the design of a structure on a foundation subjected to a cyclic loading (e.g., traffic load or machine vibration load). This paper conducted a series of dynamic triaxial tests of saturated silty clay, considering the influence of the factors of cyclic stress ratio (CSR), static deviatoric stress ratio (SDR), and overconsolidation ratio (OCR) on the resilient modulus and dynamic damping ratio of the soil. A cyclic loading with a form of half sine wave was used to model the traffic loading. The results showed that the soil was prone to failure under a higher SDR, even though the applied CSR was less than the critical CSR. The saturated silty clay performed a strain softening behavior and its dynamic properties deteriorated significantly when higher CSR and SDR and lower OCR were involved. Based on the test results, an empirical method with a form of exponential function was proposed to evaluate the resilient modulus of the soil, considering the combined effects of CSR and SDR and OCR. The proposed method was verified through a comparison with the test results in this study and from literatures, and some recommendations for its application were offered.

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Section: Introductionmentioning

confidence: 99%

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Zhang

Chen

et al. 2020

Advances in Civil Engineering

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“…The hydraulic pipe was to be cut off so that the paws of all anchor heads would be stuck into the hole wall; (11) Installation was completed. (12) The data collection is shown in Figure 9b. The monitoring results are listed in Table 5.…”

Section: Installation Process Of Internal Settlement Observationmentioning

confidence: 99%

“…In general, settlement prediction methods can be divided into two categories: Numerical calculations and deducing methods based on field data. Numerical methods [11] include the finite element method [12] and difference method, but these methods are limited by the constitutive model, the determination of material parameters, and the boundary conditions. However, deducing methods based on field monitoring data can overcome these issues.…”

Section: Introductionmentioning

confidence: 99%

Settlement Prediction and Differential Settlement Criterion for Heightening and Thickening Levee

Lan

Wang

2018

Applied Sciences

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Owing to the pavement cracking of heightening and thickening levees (HTL) caused by differential settlement, it is necessary to study the settlement prediction and differential settlement criterion for HTLs. In this study, an HTL was taken as the study object. First, leveling observation and layered settlement observation were adopted, and a generalized settlement prediction model (GSPM) that can describe both S-shaped and hyperbolic settlement–time curves was proposed. The physical meanings of GSPM parameters were analyzed. Moreover, the effectiveness of the GSPM was verified using field monitoring data. Second, finite element analysis based on a viscoelastic constitutive model was used to reveal the quantitative relationship between the differential settlement and horizontal stress of the pavement. On this basis, the differential settlement criterion was obtained. The results showed that the GSPM can unify the logistic model and hyperbolic model by introducing two morphological change parameters. In addition, the GSPM can be more widely used, more accurate, and more stable than the traditional logistic model and hyperbolic model. When an asphalt concrete pavement (whose ultimate tensile stress is 0.12 MPa) is used, the corresponding differential settlement criterion is approximately 4.3 cm. The research results can provide a reference for reasonable differential settlement control for HTLs in order to prevent pavement cracking.

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“…Soft soils are usually regarded to be problematic due to their poor engineering properties, for instance, high water content, low undrained shear strength, poor permeability and remarkable rheological properties [ 1 ]. With the increased demand of urbanization, more and more foundations of buildings and infrastructure have been built on soft soil areas [ 2 ]. As a result, a series of practical problems have arisen because of insufficient strength and/or excessive deformation of soft foundations and subgrades [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

An Improved Mechanistic-Empirical Creep Model for Unsaturated Soft and Stabilized Soils

2021

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Soft soils are usually treated to mitigate their engineering problems, such as excessive deformation, and stabilization is one of most popular treatments. Although there are many creep models to characterize the deformation behaviors of soil, there still exist demands for a balance between model accuracy and practical application. Therefore, this paper aims at developing a Mechanistic-Empirical creep model (MEC) for unsaturated soft and stabilized soils. The model considers the stress dependence and incorporates moisture sensitivity using matric suction and shear strength parameters. This formulation is intended to predict the soil creep deformation under arbitrary water content and arbitrary stress conditions. The results show that the MEC model is in good agreement with the experimental data with very high R-squared values. In addition, the model is compared with the other classical creep models for unsaturated soils. While the classical creep models require a different set of parameters when the water content is changed, the MEC model only needs one set of parameters for different stress levels and moisture conditions, which provides significant facilitation for implementation. Finally, a finite element simulation analysis of subgrade soil foundation is performed for different loading levels and moisture conditions. The MEC model is utilized to predict the creep behavior of subgrade soils. Under the same load and moisture level, the deformation of soft soil is largest, followed by lime soil and RHA–lime-stabilized soil, respectively.

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A combined method to predict the long-term settlements of roads on soft soil under cyclic traffic loadings

Cited by 33 publications

References 22 publications

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Settlement Prediction and Differential Settlement Criterion for Heightening and Thickening Levee

An Improved Mechanistic-Empirical Creep Model for Unsaturated Soft and Stabilized Soils

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