Performance of PVD improved soft ground using vacuum consolidation methods with and without airtight membrane

Long, P.V.; Nguyen, Lap Van; Bergado, Dennes T.; Balasubramaniam, A. S.

doi:10.1016/j.geotexmem.2015.05.007

Cited by 48 publications

(16 citation statements)

References 15 publications

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“…The existing studies on laboratory and in situ tests of consolidation methods mainly focus on building and pavement foundations. Long et al [31] conducted four trial sections to investigate the performance of soft ground improvement, in which different vacuum consolidation methods (VCMs) and PVD thicknesses were considered. Bergado et al [32] introduced a series of in situ tests to investigate the performance of different soft foundation treatment technologies (i.e., prefabricated vertical drain with surcharge, vacuum and heat preloading, DCM and stiffened DCM methods).…”

Section: (2) Laboratory and In Situ Testsmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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Construction issues of high-speed rail infrastructures have been increasingly concerned worldwide, of which the subgrade settlement in soft soil area becomes a particularly critical problem. Due to the high compressibility and low permeability of soft soil, the post-construction settlement of the subgrade is extremely difficult to control in these regions, which seriously threatens the operation safety of high-speed trains. In this work, the significant issues of high-speed railway subgrades in soft soil regions are discussed. The theoretical and experimental studies on foundation treatment methods for ballasted and ballastless tracks are reviewed. The settlement evolution and the settlement control effect of different treatment methods are highlighted. Control technologies of subgrade differential settlement are subsequently briefly presented. Settlement calculation algorithms of foundations reinforced by different treatment methods are discussed in detail. The defects of existing prediction methods and the challenges faced in their practical applications are analyzed. Furthermore, the guidance on future improvement in control theories and technologies of subgrade settlement for high-speed railway lines and the corresponding challenges are provided.

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Section: (2) Laboratory and In Situ Testsmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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“…Vacuum preloading is performed by forming a vacuum under a sealing membrane covering the ground, and the pressure difference across the membrane causes the soil layer to consolidate, which increases the soil effective stress by reducing the pore water pressure without changing the total stress. The vacuum preloading method was first proposed by the Swedish civil engineer Kjellman in 1952 and has been widely used in soft soil foundation treatment [21][22][23][24][25][26][27][28][29]. Electroosmotic method is accomplished by applying a direct current at both ends of a soil deposit.…”

Section: Introductionmentioning

confidence: 99%

Model Tests of Soil Reinforcement Inside the Bucket Foundation with Vacuum Electroosmosis Method

et al. 2019

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Offshore wind turbine foundations are commonly subjected to large horizontal, vertical, and bending moment loads. Marine soils have high moisture content, high compressibility, high sensitivity, and low strength, resulting in insufficient foundation bearing capacity. In order to improve the bearing capacity of wind turbine foundations and reduce foundation settlement, an internal vacuum preloading method combined with electroosmosis reinforcement is used to reinforce the soil within bucket foundations. The pore water pressure, vertical settlement, pumping quality of the soil during the reinforcement process, soil moisture content before and after the reinforcement, and undrained shear strength were analyzed. Horizontal and vertical bearing capacity model tests were carried out on the reinforced and nonreinforced soil inside the bucket foundation. Results show that vacuum preloading combined with electroosmosis reinforcement reduces soil moisture content inside the bucket foundation by approximately 20%, and the undrained shear strength of the internal soil increases by approximately 20 times. Soil reinforcement has high spatial uniformity. Results of the bucket foundation bearing capacity model show that when the soil inside the bucket foundation is strengthened, horizontal bearing capacity increased by 2.9 times and vertical bearing capacity increased by 2.1 times. Vacuum preloading combined with electroosmosis reinforcement can effectively improve the shear strength of soft soil and enhance the bearing capacity and stability of bucket foundations.

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“…Kianfar et al [17] investigated the influences of the duration of application and removal of vacuum pressures on radial consolidation by using excess pore-water pressure, axial strain, and over consolidation ratio. Long et al [18] conducted trial sections to investigate the soft ground improvement performance using different vacuum consolidation methods. Sun et al [19] analyzed a site trial of vacuum preloading and vacuum preloading in combination with electro-osmotic.…”

Section: Introductionmentioning

confidence: 99%

The Settlement Models of Deep Vacuum Dewatering Method

Feng

Lyu

Wang

2019

Advances in Civil Engineering

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e deep vacuum dewatering method is effective for groundwater control in projects. By now, although the vacuum consolidation in soft soil foundation treatment has been analyzed much, the settlement of deep vacuum dewatering has not been researched sufficiently. Because of the extra vacuum pressure, the settlement should be analyzed further. In this paper, the settlement models are derived and analyzed based on the 2 vacuum pressure distribution models (plane seepage model and Johnson's model), Imai and Chai's vacuum consolidation models, and elastic model of traditional soil mechanics. And then a project case is provided to verify the theoretical models. e results show that the proposed model is suitable to predict the settlement and provide new references for vacuum dewatering engineering.

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Performance of PVD improved soft ground using vacuum consolidation methods with and without airtight membrane

Cited by 48 publications

References 15 publications

Review of research on high-speed railway subgrade settlement in soft soil area

Review of research on high-speed railway subgrade settlement in soft soil area

Model Tests of Soil Reinforcement Inside the Bucket Foundation with Vacuum Electroosmosis Method

The Settlement Models of Deep Vacuum Dewatering Method

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