Influence of Drainage Plate Parameters on Treatment Effect in Vacuum Preloading

doi:10.12068/j.issn.1005-3026.2025.20239042

Abstract

Abstract:

In order to further optimize the layout of prefabricated vertical drains （PVD） and explore the influence of PVD parameters on the vacuum consolidation effect， based on the traditional PVD theory， a small-width， small-spacing PVD-vacuum preloading method was proposed. This method adjusted the width and spacing of the PVDs appropriately to improve the vacuum consolidation efficiency， while ensuring that the amount of PVD material remained the same value. The ratio of the time impact factor （T_h） and superimposed influencing factor （F） in vaccum preloading was defined as the characterization parameter for consolidation analysis. The changes in drainage volume， surface settlement， and other indicators during the vacuum consolidation process under different PVD parameters were compared. The results show that the consolidation efficiency of the soil increases as the T_h/F increases. Using PVDs with a width of 25 mm and a spacing of 17 mm can effectively improve the consolidation efficiency， increasing the total drainage volume by approximately 6.9% compared to the traditional layout. In addition， the use of small-width， small-spacing PVDs can effectively alleviate the attenuation of shear strength along depth and radial direction. Therefore， it can conclude that with a fixed material consumption， the use of small-width， small-spacing PVDs combined with vacuum preloading method has certain practical significance.

Key words: soft soil foundation treatment, vacuum preloading method, prefabricated vertical drains（PVD） parameters, vacuum consolidation efficiency, particle migration

CLC Number:

TU44

Ya-jun WU, Ming-can WU, Yi-tian LU, Jin-jin WU. Influence of Drainage Plate Parameters on Treatment Effect in Vacuum Preloading[J]. Journal of Northeastern University(Natural Science), 2025, 46(3): 138-144.

Figures/Tables 13

Fig. 1 Particle size distribution curve of the soil sample

Table 2 Vacuum preloading model test scheme

试验组号

PVD宽度

a/mm

PVD间距

d_e/cm

T h F

Table 2 Vacuum preloading model test scheme

试验组号

PVD宽度

a/mm

PVD间距

d_e/cm

T h F

×10^-8/t

100

6.88

28.0

54.6

Fig. 2 Physical photo of the model test device

Fig. 3 Schematic diagram of the model test device

Fig. 4 Test points distribution(unit：cm)

Fig. 5 Drainage versus time curves

Fig. 6 Th/F versus total drainage curve

Fig. 7 Settlement versus time curves

Fig. 8 Th/F versus total settlement curves

Fig. 9 Water content curves at different positions

Fig. 10 Vane shear strength at various positions

Fig. 11 Particle size distribution and particle group classification.

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