A Field Investigation to Improve Soft Soils Using Prefabricated Vertical Drain

Hore, Ripon; Chakraborty, Sudipta; Ansary, Mehedi Ahmed

doi:10.1007/s40515-019-00093-8

Cited by 10 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, the coefficient ζ was found to equal 0.908. Using Equation (5), U r at the different elevation (H) was calculated for section N5 + 850 and is plotted in Figure 11. It can be observed that U r obviously decreased with increase in the muck depth.…”

Section: Influence Of the Pvd On The Degree Of Consolidationmentioning

confidence: 99%

“…According to Terzaghi's consolidation theory (1923) [4], the consolidation time is proportional to the square of the drainage distance. Therefore, setting vertical drainage wells in natural soil layers is a commonly used method to increase the number of drainage channels and to shorten drainage distances [5]. Prefabricated vertical drains (PVDs) have the advantages of being low carbon and of saving energy in the production process at a lower cost.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deformation and Strength Characteristics of Marine Soft Soil Treated by Prefabricated Vertical Drain-Assisted Staged Riprap under Seawall Construction

Wu,

Liu,

Xie

2023

Buildings

View full text Add to dashboard Cite

Prefabricated vertical drains (PVDs) with staged riprap preloading have been widely used in soft soil ground improvement and embankment construction. However, ground treatment effectiveness evaluation is still a difficult problem due to multiple factors. Considering this, in situ monitoring and numerical simulation were conducted to study the deformation and strength characteristics of marine soft soil ground treated by PVD-assisted staged riprap under the Lingni Seawall construction in China. Monitoring and analysis of results showed that use of PVD-assisted staged riprap resulted in a good improvement effect. In particular, in the PVD-treated zone within 10 m in depth, corresponding to a half-length of the PVD, the average radial degree of consolidation reached up to 75–100%, and the soil strength increased significantly by 200–700%. Moreover, numerical simulation showed that the linear 1-dimensional drain element of PVD closely met the engineering accuracy requirements with good consistency with the monitoring data. Compared with a totally solid element model, the numbers of elements and nodes were reduced and the calculating efficiency and model accuracy were increased by using a PVD linear element, which provides a basis for building large complex finite element models.

show abstract

Section: Influence Of the Pvd On The Degree Of Consolidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation and Strength Characteristics of Marine Soft Soil Treated by Prefabricated Vertical Drain-Assisted Staged Riprap under Seawall Construction

Wu,

Liu,

Xie

2023

Buildings

View full text Add to dashboard Cite

show abstract

“…Terzaghi's consolidation theory (1923) [4] states that the consolidation time is proportional to the square of drainage distance. Several techniques were developed to reduce the consolidation time by shortening the drainage distance [5], such as the vertical drainage wells and utilization of Prefabricated Vertical Drain (PVD). PVD production consumes low energy, leading to fewer emissions and lower costs.…”

Section: Introductionmentioning

confidence: 99%

Settlement Forecast of Marine Soft Soil Ground Improved with Prefabricated Vertical Drain-Assisted Staged Riprap Filling

Wu,

Liu,

Alowaisy

et al. 2024

Buildings

View full text Add to dashboard Cite

By comparing different settlement forecast methods, eight methods were selected considering the creep of marine soft soils in this case study, including the Hyperbolic Method (HM), Exponential Curve Method (ECM), Pearl Growth Curve Modeling (PGCM), Gompertz Growth Curve Modeling (GGCM), Grey (1, 1) Model (GM), Grey Verhulst Model (GVM), Back Propagation of Artificial Neural Network (BPANN) with Levenberg–Marquardt Algorithm (BPLM), and BPANN with Gradient Descent of Momentum and Adaptive Learning Rate (BPGD). Taking Lingni Seawall soil ground improved with prefabricated vertical drain-assisted staged riprap filling as an example, forecasts of the short-term, medium-term, long-term, and final settlements at different locations of the soft ground were performed with the eight selected methods. The forecasting values were compared with each other and with the monitored data. When relative errors were between 0 and −1%, both the forecasting accuracy and engineering safety were appropriate and reliable. It was concluded that the appropriate forecast methods were different not only due to the time periods during the settlement process, but also the locations of soft ground. Among these methods, only BPGD was appropriate for all the time periods and locations, such as at the edge of the berm, and at the center of the berm and embankment.

show abstract

“…According to Wang et al [3], the secondary consolidation settlement continues in a gradual embankment after unloading, but the settlement amount is minimal. The main advantage of PVD on soft soils is that it can significantly accelerate soil settlement [4] [11] [12][13] [14] [15]. The time needed to achieve a degree of consolidation of 90% is highly dependent on the PVD installation pattern and the distance between the PVD installations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Installation Pattern of Prefabricated Vertical Drain (PVD) on Degree of Consolidation in Soft Soils

Liliwarti,

Archenita,

Misriani

et al. 2023

fondasi

View full text Add to dashboard Cite

Soft soil has high water content and low permeability, causing a high settlement and long time. Soil improvement with prefabricated Vertical Drain (PVD) can accelerate settlement in soft soils and primary consolidation time. Prefabricated Vertical Drain (PVD) functions to accelerate the release of water from the ground, and the accelerated settlement process, which is indicated by the degree of consolidation (U) reaching 90%, generally this method combines PVD and preloading (additional load). The required time to achieve a 90% degree of consolidation is determined by the PVD installation pattern (triangle pattern and rectangular pattern) and its distance. This study reviewed the effectiveness of PVD installation patterns with distance variations of (1 m, 1.3 m, 1.6 m, 1.9, 2.2 m, 2.5 m, 2.8 m, and 3.1 m). The analysis results show that in the triangular pattern, the time required to achieve a degree of consolidation of 90% (U90) is from 1 to 8.5 months, and in the rectangular pattern is from 1 to 9.5 months. The greater distance between PVDs, the more time is required to achieve a 90% degree of consolidation (U90). The PVD with a triangular pattern could reduce the 6% -25% time to complete a degree of consolidation (U90) compared to the rectangular pattern. It can be noted that the installation triangle pattern is more effective than the rectangular installation pattern.

show abstract

A Field Investigation to Improve Soft Soils Using Prefabricated Vertical Drain

Cited by 10 publications

References 10 publications

Deformation and Strength Characteristics of Marine Soft Soil Treated by Prefabricated Vertical Drain-Assisted Staged Riprap under Seawall Construction

Deformation and Strength Characteristics of Marine Soft Soil Treated by Prefabricated Vertical Drain-Assisted Staged Riprap under Seawall Construction

Settlement Forecast of Marine Soft Soil Ground Improved with Prefabricated Vertical Drain-Assisted Staged Riprap Filling

Effect of Installation Pattern of Prefabricated Vertical Drain (PVD) on Degree of Consolidation in Soft Soils

Contact Info

Product

Resources

About