Review of research on high-speed railway subgrade settlement in soft soil area

Zhou, Shunhua; Wang, Binglong; Shan, Yao

doi:10.1007/s40534-020-00214-x

Cited by 80 publications

(29 citation statements)

References 105 publications

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“…(1) e subgrade and foundation soils are homogeneous, continuous, and isotropic elastoplastic materials. (2) e yield criterion of the material is combined with the Mohr-Coulomb ideal elastoplastic constitutive model to form a constitutive soil model [14,15]. (3) e contact between the subgrade and foundation soil is continuous and completely bonded.…”

Section: Subgrade Finite Element Modelmentioning

confidence: 99%

“…is results in great differences in the settlement, as well as the additional stress of the widened subgrade and pavement. us, soft soil foundation treatment is currently the focus of much academic interest [1][2][3]. Tan et al employed the finite element method to analyze the settlement deformation of the widening subgrade with PTC piles and compared the results with measured values [4].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Embankment Settlement on Soft Soil Subgrade with a Cement Mixed Pile

Yang

2021

Advances in Civil Engineering

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The settlement of the widening of soft soil subgrade highways is typically associated with different treatment positions of cement mixed piles. In order to overcome this, in the current paper we employ the finite element method to simulate and analyze the influence of piles under an existing road slope and under an existing subgrade and new embankment on the settlement characteristics of the subgrade and foundation. In particular, we focus on the influence of the pile length and pile spacing on the subgrade and foundation settlements based on a northern high-speed reconstruction and expansion project. The subgrade and foundation soils in the finite element analysis are considered to be homogeneous, continuous, and isotropic elastoplastic materials. The Mohr–Coulomb ideal elastoplastic constitutive model is implemented as the constitutive soil model. The impact of piles under an existing subgrade and new embankment on the settlement is observed to be more significant than that of piles under the existing road slope. Moreover, the subgrade and foundation settlements increase with the pile spacing under the existing road slope and under the existing subgrade and new embankment. More specifically, an increase of the pile spacing from 200% to 400% of the pile diameter is associated with an increase in the maximum settlement of the foundation surface from 1.76 to 1.85 cm (existing road slope) and from 1.44 to 1.96 cm (existing subgrade and new embankment). In addition, the subgrade and foundation settlements decrease for increasing pile lengths under the existing road slope and under the existing subgrade and new embankment, the pile length increases from 4.7 to 9.2 m, and the maximum foundation surface settlement is reduced from 6.2 to 5.52 cm and from 9.73 to 5.43 cm, respectively. The results can provide reference for future subgrade widening projects.

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Section: Subgrade Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Embankment Settlement on Soft Soil Subgrade with a Cement Mixed Pile

Yang

2021

Advances in Civil Engineering

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“…Owing to the continuing development of high-speed rail projects in China and other countries, track substructures require careful attention to ensure the safe delivery of passengers [1]. In the case of a high-speed rail embankment, two major challenges may arise when weak foundation soil occurs: low strength and high compressibility of weak soils that poses geotechnical problems to infrastructures and control of post-construction settlement [2,3]. Embankment reinforced with rigid piles has been universally recognized as an effective solution to minimize the settlement of weak subsoil, which contributes greatly to deformation [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Simplified analytical solution for stress concentration ratio of piled embankments incorporating pile–soil interaction

Luo

Wei

et al. 2021

Rail. Eng. Science

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Piled embankments have been extensively used for high-speed rail over soft soils because of their effectiveness in minimizing differential settlement and shortening the construction period. Stress concentration ratio, defined as the ratio of vertical stress carried by pile heads (or pile caps if applicable) to that by adjacent soils, is a fundamental parameter in the design of piled embankments. In view of the complicated load transfer mechanism in the framework of embankment system, this paper presents a simplified analytical solution for the stress concentration ratio of rigid pile-supported embankments. In the derivation, the effects of cushion stiffness, pile–soil interaction, and pile penetration behavior are considered and examined. A modified linearly elastic-perfectly plastic model was used to analyze the mechanical response of a rigid pile–soil system. The analytical model was verified against field data and the results of numerical simulations from the literature. According to the proposed method, the skin friction distribution, pile–soil relative displacement, location of neural point, and differential settlement between the pile head (or cap) and adjacent soils can be determined. This work serves as a fast algorithm for initial and reasonable approximation of stress concentration ratio on the design aspects of piled embankments.

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“…More and more buildings, roads and railways are built on soft soil, and their construction schemes and use functions require more accurate determination of their settlement in the construction period and operation period [1]. Now there are effective stabilization technologies to reduce settlement, such as the realization of pile foundations [2,3].…”

Section: Introductionmentioning

confidence: 99%

Research on HC-LSSVM Model for Soft Soil Settlement Prediction Based on Homotopy Continuation Method

et al. 2021

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Prediction of soft soil settlement is an important research topic in the field of civil engineering, and the least square support vector machine is one of the commonly used prediction methods at present. Nonetheless, the existing LSSVM models have problems of low search efficiency in the search process and lack of global optimal solution in the search results. In order to solve this problem, based on the leave-one-out cross-validation method, the homotopy continuation method was used to optimize the LSSVM model parameters, and then the HC-LSSVM model was constructed with the goal of minimizing the sum of squares of the prediction error of the full sample retention one. Finally, the rationality and correctness of the model are verified by engineering application. The results show that the HC-LSSVM model constructed in this study can accurately predict the settlement of soft ground, which is superior to the common LSSVM model and solves the problem that the parameters of LSSVM model cannot be solved optimally. The research results provide a new method for prediction of soft soil settlement.

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Review of research on high-speed railway subgrade settlement in soft soil area

Cited by 80 publications

References 105 publications

Analysis of the Embankment Settlement on Soft Soil Subgrade with a Cement Mixed Pile

Analysis of the Embankment Settlement on Soft Soil Subgrade with a Cement Mixed Pile

Simplified analytical solution for stress concentration ratio of piled embankments incorporating pile–soil interaction

Research on HC-LSSVM Model for Soft Soil Settlement Prediction Based on Homotopy Continuation Method

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