Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading

Ni, Pengpeng; Kai, Xu; Mei, Guoxiong; Zhao, Yanlin

doi:10.1016/j.geotexmem.2018.09.004

Cited by 45 publications

(13 citation statements)

References 45 publications

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“…Because of the features of large void ratio, high compressibility, and low permeability for dredged soils, the self‐weight consolidation process could take a long time. Different preloading techniques, including electro‐osmosis preloading, vacuum preloading, and surcharge preloading, have been employed to accelerate the consolidation process. Vertical drainage channels are often included in the soil, such as the use of prefabricated vertical drains, sand drains, stone columns, pervious concrete piles, and permeable pipe piles .…”

Section: Optimization Of the Layout Of Horizontal Drainmentioning

confidence: 99%

One‐dimensional self‐weight consolidation with continuous drainage boundary conditions: Solution and application to clay‐drain reclamation

Feng

Mei

2019

Num Anal Meth Geomechanics

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Summary Traditional consolidation theories cannot provide good predictions of consolidation settlement in land reclamation because of their assumptions that the influence of soil's self‐weight is often neglected, and the drainage boundary is considered as fully pervious/impervious. In view of these limitations, an analytical solution is derived for one‐dimensional self‐weight consolidation problems with a continuous drainage boundary using the finite Fourier sine transform method. Following the classical Terzaghi's small strain theory, the soil's self‐weight is considered to produce consolidation settlement in dredged materials with a constant coefficient of consolidation. The continuous drainage boundary can essentially describe the time‐dependent variation of drainage capacity at the interface between two adjacent soil layers. By reducing the interface parameters, the effectiveness of the calculation is demonstrated against the Terzaghi's solution. The influence of interface parameters and soil's self‐weight stress coefficient on self‐weight consolidation is discussed. As expected, the rate of consolidation considering the self‐weight stress is faster, although the dependency of consolidation rate on the material property of void ratio is neglected. Moreover, the plane of maximum excess pore‐water pressure is estimated as a function of time factor, based on which a design chart is developed to optimize the layout of horizontal drains in land reclamation.

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Section: Optimization Of the Layout Of Horizontal Drainmentioning

confidence: 99%

One‐dimensional self‐weight consolidation with continuous drainage boundary conditions: Solution and application to clay‐drain reclamation

Feng

Mei

2019

Num Anal Meth Geomechanics

Self Cite

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“…For cases 1 and 2, during the construction of the bridge approach (0-6 days), the subbase surface settlement for the filling materials of either FRFC or GCS is close, although the settlement for the filling of FRFC is slightly smaller due to its lightweight. This can be explained by the fact that the excess pore water pressure generated from the filling load increases rapidly due to the fast construction speed and it cannot be effectively dissipated in a short period, leading to most of the load being sustained by the pore water and slow development in the effective stress of soil and associated settlement, as studied by Feng et al (2019) and Ni et al (2019). After the construction of bridge approach is completed since the day of 7, the excess pore water pressure is dissipated with time under the constant load of bridge approach backfill of 6 m and a large increase of associated consolidation settlement of foundation soil can be found from 7 to 10 days.…”

Section: Ground Surface Settlement Of the Bridge Approachmentioning

confidence: 99%

Assessment of the use of fiberglass-reinforced foam concrete in high-speed railway bridge approach involving foundation cost comparison

Liu

Fei

et al. 2019

Advances in Structural Engineering

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In view of the limited use of foam concrete for backfilling high-speed railway bridge approach and no publication considering the associated foundation treatment cost, this article presents a series of laboratory tests to study the mechanical properties of fiberglass-reinforced foam concrete with different contents of fiberglass, whereby the optimal values of target density and fiberglass content for fiberglass-reinforced foam concrete are obtained. A numerical model is developed to investigate the performance of bridge approach filled with fiberglass-reinforced foam concrete under different levels of foundation treatment in comparison with the control group with traditional backfills (combination of graded crushed stone and cement). Results indicate that the application of fiberglass-reinforced foam concrete to fill high-speed railway bridge approach can significantly improve the bridge approach performance (decreasing the horizontal displacement and ground surface settlement, respectively, by 58% and 21% than the control group) and cut down the foundation treatment cost by 19% concurrently.

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“…The average degree of consolidation is usually used as one of the criteria for assessing the effectiveness of soil consolidation and improvement [48]. In general, there are two common methods widely used to define the average degree of consolidation [49,50].…”

Section: Geofluidsmentioning

confidence: 99%

A One-Dimensional Fractional-Derivative Viscoelastic Model for the Aquitard Consolidation of an Aquifer System

Huang

2019

Geofluids

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Land subsidence resulting from the withdrawal of groundwater is one of the problems of major importance to geosciences and geomechanics. In order to analyze the phenomena of land subsidence, this study attempts to constitute a more reliable prediction model to simulate the consolidation process of the aquifer system under the drawdown of groundwater. A fractional-derivative viscoelastic model is introduced to characterize the rheological properties of the aquitard, and the equation governing the consolidation process is established on the basis of the one-dimensional consolidation theory. The semianalytical solutions for the pore-water pressure, the settlement of aquitard, and the degree of consolidation are deduced using both finite sine transform and Laplace transform. Then, the comparisons of two special cases are performed to validate the correctness of the proposed model. The variations in the degree of consolidation and settlement of the aquitard are simulated to analyze the consolidation behavior of the aquifer system, and the influences of model parameters and the drawdown speed of groundwater are investigated.

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Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading

Cited by 45 publications

References 45 publications

One‐dimensional self‐weight consolidation with continuous drainage boundary conditions: Solution and application to clay‐drain reclamation

One‐dimensional self‐weight consolidation with continuous drainage boundary conditions: Solution and application to clay‐drain reclamation

Assessment of the use of fiberglass-reinforced foam concrete in high-speed railway bridge approach involving foundation cost comparison

A One-Dimensional Fractional-Derivative Viscoelastic Model for the Aquitard Consolidation of an Aquifer System

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