Mechanism test on inhomogeneity of dredged fill during vacuum preloading consolidation

Fang, Yingguang; Guo, Lingfeng; Huang, Junhui

doi:10.1080/1064119x.2018.1522398

Cited by 25 publications

(12 citation statements)

References 22 publications

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“…According to the data from laboratory tests (Fang et al, 2019), the permeability of the clogging zone could be 1% of that in the normal zone, which is much lower than that in the smear zone and that caused by nonuniform consolidation (Zhou et al, 2017). Therefore, to consider the clogging in the soil, the permeability ratio (kc/kh) is assumed to be 1/50 in the following cases.…”

Section: Parametric Analysismentioning

confidence: 99%

“…Moreover, soil properties in the clogging zone and outside the zone varied in many aspects. The proportion of fine particles in the clogging zone was greater than that outside the zone (Wang et al, 2017;Deng et al, 2018;Fang et al, 2019). Those fine particles filled the pores of the soil, reducing compressibility in the clogging zone.…”

Section: Introductionmentioning

confidence: 99%

“…However, the slurry has some properties that are extremely unfavorable for further construction, including high water content, low bearing capacity, and high compressibility (Zeng et al, 2016;Deng et al, 2019, Fang et al, 2019, all of which need to be improved.…”

Section: Introductionmentioning

confidence: 99%

“…Those fine particles filled the pores of the soil, reducing compressibility in the clogging zone. The permeability in the clogging zone was also much reduced, which impeded the water drainage and caused poor improvement quality (Fang et al, 2019). Therefore, the causes of poor improvement quality can be summarized in two aspects: the first is clogging occurring at the drain surface, which is manifested as a reduced discharge capacity of the PVDs, and the second is clogging occurring in the soil near the drains.…”

Section: Introductionmentioning

confidence: 99%

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Consolidation Considering Clogging Effect under Uneven Strain Assumption

et al. 2021

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Section: Parametric Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Consolidation Considering Clogging Effect under Uneven Strain Assumption

et al. 2021

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“…Using the indoor model experiment of SVP, Yuan [23] demonstrated that moisture content in soil decreased in each stage and that bearing capacity increased with a decrease in moisture content, which proved that the SVP method exerts a consolidation effect in each stage. Fang et al [24] conducted an SVP test to apply vacuum pressure at the subsequent level on the basis of time rather than the completion of consolidation in each stage. Compared with TVP, the SVP method required longer to complete and exhibited a lower initial drainage rate.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effectiveness of the Step Vacuum Preloading Method: A Case Study on High Clay Content Dredger Fill in Tianjin, China

Chen

Yuan

et al. 2020

JMSE

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As a solution to avoid the blockage of the drainage pipe by traditional vacuum preloading, step vacuum preloading (SVP) has been progressively studied. However, the effectiveness of this technique has yet to be systematically analyzed. In this study, an indoor model test was conducted in which vacuum pressure was applied in five stages (10, 20, 40, 60, and 80 kPa) to dredger soil with high clay content at a reclamation site in Binhai New Area, Tianjin, China. The extent of the consolidation effect of the soil was determined, and the effectiveness of the step vacuum preloading method to address drainage pipe blockage was evaluated. The results indicate that soil settlement increases at each stage of vacuum pressure treatment and the degree of vertical consolidation at each stage exceeds 90%. At the end of the treatment stage with vacuum pressure of 80 kPa, the weakly bound water was discharged. Dissipation of pore water pressure occurred in all stages. On the basis of these results, it is shown that SVP can efficiently reinforce dredger fill. Moreover, after SVP, the grain size of the soil and void ratio are still uniformly distributed. Regardless of their location from the drainage pipe, soil exhibits permeability coefficients within the same order of magnitude. The consolidation effect of soil in each stage and the increased drainage rate in the initial stage of vacuum preloading with 80 kPa indicate that the test in the current study can decrease the horizontal displacement of fine particles and can avoid drainage pipe blockage.

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