Performance of a test embankment on very soft clayey soil improved with drain-to-drain vacuum preloading technology

López-Acosta, Norma Patricia; Espinosa-Santiago, Alejandra Liliana; Pineda-Núñez, V.M.; Ossa, Alexandra; Mendoza, Manuel J.; Ovando-Shelley, Efraín; Botero, Eduardo Uribe

doi:10.1016/j.geotexmem.2019.103459

Cited by 34 publications

(14 citation statements)

References 45 publications

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“…Researchers have also investigated the groundwater dynamics and water balance in a linearly consolidated aquitard (Li & Zhou, 2015;Zhou, Guo, & Dou, 2013). For a nonlinearly consolidated aquitard (e.g., newly formed sedimentary soft soil), the variation of hydraulic properties varies nonlinearly due to the consolidation of the aquitard (Gibson et al, 1981;López-Acosta et al, 2019;Müthing et al, 2018;Poskitt, 1969;Xie & Leo, 2004). In general, Terzaghi's (1943) small-strain consolidation theory is not suitable when the calculation error of aquitard deformation is larger than 10% through Terzaghi's theory (Li et al, 2018;Olson & Ladd, 1979;Zheng, 2004).…”

Section: Introductionmentioning

confidence: 99%

An Analytical Method to Calculate Groundwater Released From an Aquitard Undergoing Nonlinear Consolidation

Luo

et al. 2020

Water Resources Research

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Section: Introductionmentioning

confidence: 99%

An Analytical Method to Calculate Groundwater Released From an Aquitard Undergoing Nonlinear Consolidation

Luo

et al. 2020

Water Resources Research

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“…Vacuum preloading was regarded as one of the effective methods of reinforcing foundations in areas with super soft soil [13]. Generally, it improved the load capacity and reduced settlement in airport runways, oil storage stations and land reclamation projects [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Vacuum Preloading for Chemically Conditioned Municipal Sludge

Li¹,

Zhan²,

Wang³

et al. 2023

Journal of Renewable Materials

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Municipal sludge is a sedimentation waste produced during the wastewater process in sewage treatment plants. Among recent studies, pilot and field tests showed that chemical conditioning combined with vacuum preloading can effectively treat municipal sludge. To further understand the drainage and consolidation characteristics of the conditioning sludge during vacuum preloading, a large deformation nonlinear numerical simulation model based on the equal strain condition was developed to simulate and analyze the pilot and field tests, whereas the simulation results were not satisfactory. The results of the numerical analysis of the pilot test showed that the predicted consolidation degree was greater than that measured by the field tests, which is attributed to the relatively low permeability layer formed during the preloading process of the prefabricated vertical drain. To better reflect the consolidation process of the conditioned sludge, a simplified analysis method considering the low permeability layer around the prefabricated vertical drain was proposed. The initial permeability coefficient of the low permeability layer is determined via numerical simulations using finite difference method. The predicted settlement curve was in good agreement with the measured results, which indicated that the numerical simulation based on the equal strain condition considering the relatively low permeability layer can better analyze the consolidation process of ferric chloride-conditioning sludge with vacuum preloading.

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“…These projects include land reclamation projects and subgrade projects in which the soil mass needs to be strengthened. The technique is low cost, requires a short period to complete construction, requires no filling materials, involves no heavy machinery, and provides good reinforcement [1][2][3][4][5][6][7]. Regardless, the traditional vacuum preloading (TVP) method still has several disadvantages: On the one hand, under the action of vacuum pressure and water flow, fine soil particles gradually migrate to the vicinity of the prefabricated vertical drainage pipe, forming a low-permeability layer near the drainage pipe.…”

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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Performance of a test embankment on very soft clayey soil improved with drain-to-drain vacuum preloading technology

Cited by 34 publications

References 45 publications

An Analytical Method to Calculate Groundwater Released From an Aquitard Undergoing Nonlinear Consolidation

An Analytical Method to Calculate Groundwater Released From an Aquitard Undergoing Nonlinear Consolidation

Numerical Simulation of Vacuum Preloading for Chemically Conditioned Municipal Sludge

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

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