Numerical analysis for widening embankments over soft soils treated by PVD and DJM columns

Jiang, Xin; Jiang, Yifan; Wu, Chaoyang; Wang, Wenqi; Geng, Jian-Yu; Qiu, Yanjun

doi:10.1080/10298436.2018.1461869

Cited by 21 publications

(10 citation statements)

References 6 publications

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“…The subsoil consists of 14 m of untreated silty clay, and 5 m of dense sand lowers it in the model (Jiang et al, 2020). The embankment height is 4 m. The slope gradient is 1:1.5.…”

Section: Geometry Modelmentioning

confidence: 99%

“…Many researchers have paid attention to it at present. The theoretical research is relatively mature, especially in ground improvements for reducing differential settlement between new and existing embankment, including gapmethod (Van Meurs et al, 1999), foundation columns (Han et al, 2007), prefabricated vertical drains (PVD) and dry jet mixing (DJM) columns (Jiang et al, 2020). The other is to construct an entirely new wide embankment directly.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Settlement Behaviour of Soft Ground Under Wide Embankment

Jiang

Chen

et al. 2021

BJRBE

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An elastoplastic numerical model for calculating the consolidation settlement of wide embankment on soft ground is established using PLAXIS finite element software to investigate the settlement behaviour of soft ground under the wide embankment. The distribution rules are analysed and compared to narrow embankments, such as surface settlements of ground and embankment, lateral displacement of soft ground at the foot of embankment slope and excess pore pressure in soft ground. The influence rule of elastic modulus of soft ground on the settlement of soft ground under wide embankment is discussed. The results show that the settlement distributions of wide and narrow embankments on soft ground are “W” and “V” shapes, respectively. The maximum settlement of wide embankment is near the foot of the embankment slope, which is unequal to the settlement at the centreline of the embankment. The lateral displacement distribution rules of soft ground are both “belly” shaped at the foot of two types of embankments slope. However, the lateral displacement of the wide embankment is larger in each corresponding stage. During the construction period, the excess pore pressure in the soft ground under the wide embankment is much higher than that of the narrow embankment, so the post-construction consolidation time of the wide embankment is longer. Moreover, the macroscopic settlement rule of the wide embankment is still the same with the increase of elastic modulus of soft ground.

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“…The subsoil consists of 14 m of untreated silty clay, and 5 m of dense sand lowers it in the model (Jiang et al, 2020). The embankment height is 4 m. The slope gradient is 1:1.5.…”

Section: Geometry Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Settlement Behaviour of Soft Ground Under Wide Embankment

Jiang

Chen

et al. 2021

BJRBE

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“…Shi et al (2020) obtained similar conclusions. Using PLAXIS, Jiang et al (2020) established a finite element model for embankment treatment with prefabricated vertical drains (PVD) and dry jet mixing (DJM) columns in the soft ground of highway widening engineering. It shows that DJM treatment greatly reduces the settlement during construction, the settlement and differential settlement after construction, and the lateral displacement compared to PVD.…”

Section: Research Progress Of Embankment Separated Widening and Isolating Wallmentioning

confidence: 99%

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Jiang

et al. 2021

BJRBE

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In this paper, the typical cases of subgrade separated widening project in China are summarised. The research progress of subgrade separated widening and isolating wall applications are reviewed in highway reconstruction and extension. A numerical model is established based on the PLAXIS finite element software, considering both material nonlinearity and geometric nonlinearity. The effect mechanism of the isolating wall is discussed on the settlement control of the new and existing embankment on soft ground. The effect rule of the core design parameters of the isolating wall is revealed on the settlement disturbance of the existing embankment, such as location, depth, thickness and elastic modulus, and the weight rank of the influence is analysed. The results indicate that the isolating wall effectively reduces the lateral displacement and vertical settlement of the existing embankment, and there is an optimal design location for the isolating wall. In addition, with the increase of design parameters of the isolating wall, including depth, thickness and elastic modulus, the overall settlement of the existing embankment tends to be uniform, and there are optimal values. Furthermore, the depth of isolating wall is given priority, compared to location, thickness and elastic modulus during the isolating wall design process. The research results lay a theoretical foundation for the design optimisation of the isolating wall in the separated widening project of soft ground.

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“…In order to solve this problem of inconsistent settlement, model tests 19 , 20 and numerical analyses 21 – 24 have been carried out to evaluate the deformation of widened expressways. Generally, inconsistent settlements are induced by soils 25 – 30 and water 31 .…”

Section: Introductionmentioning

confidence: 99%

Embankment deformation characteristics analysis of an expressway widening project near a pond

Zhang²,

Xiao

et al. 2023

Sci Rep

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New and old subgrade stability is a crucial problem for widening projects in soft soil foundations because uncoordinated deformations can cause serious engineering accidents, even disasters. In order to ensure the stability of a widening expressway project near a pond in the Qinbei section, a series of on-site investigations, lab tests, and numerical analyses was performed. The settlement and displacement of on-site monitoring were carried out during the construction period to verify the analyzed results. It was found that the uneven settlement caused heavy settlement and displacement of the embankment; thus, net cracks and longitudinal cracks occurred in the expressway. The new embankment was also affected by the weak foundation; therefore, the foundation should be reinforced before the construction of the widening part. Considering the economy and effectiveness of the widening project, the replacement method was recommended for the weak foundation reinforcement based on the numerical analysis and on-site motoring results. Water pumping had a significant effect on the settlement of the embankment. Water pumping caused seepage in the foundation and increased the effective stress of the soil, making the foundation more consolidated. The pond slope should be reinforced before the construction of the embankment because it was not confined by the surrounding soil. Therefore, the slope soil could not provide sufficient passive soil pressure and easily slide.

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Numerical analysis for widening embankments over soft soils treated by PVD and DJM columns

Cited by 21 publications

References 6 publications

Analysis of Settlement Behaviour of Soft Ground Under Wide Embankment

Analysis of Settlement Behaviour of Soft Ground Under Wide Embankment

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Embankment deformation characteristics analysis of an expressway widening project near a pond

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