Radial Filtration Model of Clogging Column for Prefabricated Vertical Drain Treatment of Slurry

Shi, Li; Yin, Xing; Ye, Xiaoqian; He, Zili; Sun, Honglei; Cai, Yuanqiang

doi:10.1061/(asce)gt.1943-5606.0002925

Cited by 7 publications

(3 citation statements)

References 45 publications

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Section: Evaluation Criteria For Core-board Clogging Of Pvdmentioning

confidence: 99%

“…This leads to severe clogging in the grooves of the core board and a drastic reduction in the longitudinal water flow performance of the drainage board. However, in current relevant regulations [14][15][16]18] and engineering practices, whether the core-board longitudinal water flow rates of PVD without bending can satisfy the requirements of regulations is used as the control criterion for core-board drainage performance of PVD, which is not entirely scientific.…”

Section: Evaluation Criteria For Core-board Clogging Of Pvdmentioning

confidence: 99%

“…Therefore, during the process of vacuum preloading, small particles could easily accumulate in PVD, thus resulting in clogging and affecting water drainage and soil consolidation. Some scholars [17][18][19] argued that the resistance exerted on soil particles by the vacuum pressure gradient is 5-10 times higher than the gravity. As a result, the permeability of vacuum-consolidated soil columns is lower than the permeability of gravity-consolidated soil masses, and the low permeability of these dense soil columns severely inhibits the drainage of surrounding slurry, with a so-called clogging problem emerging.…”

Section: Introductionmentioning

confidence: 99%

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Clogging Behaviors in PVD and Their Evaluation Criteria for Dredged Mud Slurry

Bao,

Guo,

Dong

et al. 2023

Water

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During the consolidation period of vacuum preloading drainage of dredged mud slurry, the clogging behaviors of the filter drainage structural layers and the core boards of prefabricated vertical drains (PVD) determine the drainage capacities of PVD. However, currently, there is a lack of comprehensive research on the evaluation criteria for these two clogging behaviors. Therefore, based on typical dredged mud slurry, typical geomembranes, and raw material core boards with different bending forms, relevant macro and micro-scale experimental studies have been carried out in this study. The research results show that (1) with the application of the gradient ratio test method, the clogging behaviors of filter membranes of PVD under graded vacuum preloading can be effectively simulated. Also, in the design of graded vacuum preloading, characteristics of equivalent pore sizes and pore structures should be emphasized to investigate the suitability of filtration and drainage performance of PVD filter membranes. (2) The compressive yield strength of core board grooves is a key factor influencing the reduction rate of flow capacity. The reduction rate of flow capacity and well resistance increment can be used as comprehensive indicators reflecting the clogging behaviors of core boards, while the bending angles and bending rates of core boards can be used as specific technical indicators. (3) The proposed clogging evaluation criteria for PVD are as follows: a filter membrane gradient ratio (GR) > 4.0, a core board bending rate >60% and a core board bending angle < 45°, or a reduction rate of flow capacity of bending drainage board > 90% or well-resistance increment > 9. Also, these criteria can be incorporated into the control indicators for drainage performance of PVD used in such types of foundations.

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Section: Evaluation Criteria For Core-board Clogging Of Pvdmentioning

confidence: 99%

Section: Evaluation Criteria For Core-board Clogging Of Pvdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Clogging Behaviors in PVD and Their Evaluation Criteria for Dredged Mud Slurry

Bao,

Guo,

Dong

et al. 2023

Water

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A two‐stage combined filtration‐consolidation model for slurry ground treated by vacuum preloading

Ye,

Shi,

Cai

2024

Num Anal Meth Geomechanics

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The vacuum preloading technique is extensively employed for ground improvement, particularly for slurry ground characterized by high‐water content and low strength. Such ground frequently exhibits a delay in pore water pressure dissipation when treated with prefabricated vertical drains. To clarify the drainage and consolidation behaviour of high‐water content slurry ground under vacuum preloading, this study proposed a two‐stage combined model that integrates both filtration and consolidation processes. Initially, an axisymmetric filtration model was used to describe the formation of the soil column through the radial migration and compaction of the particles. The end‐of‐filtration radial distributions of void ratio, permeability coefficient, and effective pressure served as initial conditions for the consolidation stage analysis. This stage was depicted using a large strain consolidation model based on the free strain condition. The results showed the necessity of incorporating the filtration stage to capture the overall drainage mechanism and characteristics of slurry ground with vacuum preloading treatment.

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