A pilot test on a membraneless vacuum preloading method

Sun, Liqiang; Guo, Wei; Chu, Jian; Nie, Wen; Ren, Yuxiao; Yan, Shuwang; Hou, Jinfang

doi:10.1016/j.geotexmem.2017.01.005

Cited by 28 publications

(7 citation statements)

References 20 publications

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“…To improve the engineering properties of soft soil, prefabricated vertical drains (PVDs) assisted by vacuum pressure have been commonly used in engineering practice. [11][12][13][14] However, one difficulty of treating slurries via PVDs is that the equipment and personnel cannot access the construction site to install the PVDs because of the negligible bearing capacity of mud slurry at high water content. To install PVDs, a time-consuming or expensive pre-treatment (e.g., sun drying, cement mixing and others) 15 is commonly required for slurries to gain some initial strength.…”

Section: Introductionmentioning

confidence: 99%

Plane‐strain model for large strain consolidation induced by vacuum‐assisted prefabricated horizontal drains

Song

Yin

et al. 2023

Num Anal Meth Geomechanics

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Vacuum-assisted prefabricated horizontal drain (PHD) can be used to accelerate the consolidation process of dredged mud slurry with high water content, and this method exhibits advantages over traditional treatment methods that use prefabricated vertical drain (PVD). However, large-strain model that can simulate soil consolidation induced by vacuum-assisted PHDs is missing in the literature, although the large-strain models for PVD-induced radial consolidation are abundant. This study presents a piecewise-linear plane-strain model for large-strain consolidation induced by vacuum-assisted prefabricated horizontal drains. The model is called PCS, abbreviation for Plane-strain Consolidation Settlement. PCS model can account for complex conditions including large strain, multiple layers of PHD boards, staged filling of soil layers, varying spacing of PHD boards, time-dependent surcharge and/or vacuum loading, soil self-weight, nonlinear compressibility, and hydraulic conductivity during the consolidation process, vertical and horizontal flows, and non-Darcian flow. The PCS is validated using the two-dimensional Terzaghi's consolidation theory (small strain) and a largescale laboratory model test (large strain), which involves multiple soil layers filled in stages, multiple PHD layers, and different horizontal spacings of PHD boards. Lastly, the proposed model is applied to a case study conducted at Shimokita Peninsula (Aomori Prefecture, Japan), where vacuum-assisted PHDs have been used to treat the dredged mud slurry for a duration of 330 days.

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Section: Introductionmentioning

confidence: 99%

Plane‐strain model for large strain consolidation induced by vacuum‐assisted prefabricated horizontal drains

Song

Yin

et al. 2023

Num Anal Meth Geomechanics

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“…The membranes are used to seal the whole site to create airtight conditions. As only a limited size of membranes can be placed at one time, site subsections are therefore required for a large land reclamation project [9]. When applying the vacuum preloading technology for dewatering and consolidation of clay with a high water content, such as newly dredged slurry, sewage slug, and mining ponds mud, one more limitation is the fine particles may move inward to the PVDs' surface, clog the drainage path, decrease drainage efficiency and form a soil column [10].…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in the Vacuum Preloading Technique in China

et al. 2022

Self Cite

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A series of studies have confirmed that vacuum preloading can effectively accelerate the consolidation process of soft soil. In recent years, further improvement in the efficiency of this method is still the continuing goal of scholars. This paper reviews the recent improvements in the vacuum preloading techniques as well as their practical applications in China. The advantages and disadvantages of each method are discussed. It is found that replacing or eliminating one or more components of the vacuum preloading system, such as sand-free, membrane-free, horizontal drain, multiple-step, and air booster vacuum preloading methods, achieved similar soil improvement effects to those of the traditional vacuum preloading method. Vacuum preloading combined with other soil improvement methods could improve the soil with the lower average water content and the higher average shear strength.

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“…Scientist have used a cap installed at the intersection between vertical and horizontal drains [14], [15] and added vacuum specially for suction of pore air pressure [16]- [18]. The scientists also have combined pneumatic fracturing method [19], membranelles vacuum for compressible improvement [20], and compact vacuum consolidation. Beside the development of VCM tools, many scientists also had developed new methods or model analyses, which are numerical and finite analysis about soft soil settlement related to the implementation of VCM [22]- [28].…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of Vacuum Consolidation to Soft Soil Settlement

Puspita¹,

Capri²

2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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The main issue of building constructions on soft soils is not a uniform settlement of soft ground, which has a slow process that effected construction failures and rising maintenance expenses. For many decades, to the improvement of ground soil stability, then applied using prefabricated vertical drain (PVD). Along the development of science and technologies, which followed by improvement of the soil stability method, that is called as Vacuum Consolidation Method (VCM). The objectives of this study are to determine how the effectiveness of vacuum consolidation with various patterns to soft soil settlement of constructions, and to find the right spacing of PVD installation due to un-uniform settlement of soft soils. The analysis of this study compared the numbers and rates of settlements in preloading, PVD, and VCM with various patterns, and to get a uniform settlement by two scenarios analysis, which are various spacing with single suction pressure (scenario 1) and single spacing with various suction pressures. Based on the result of analysis which showed the settlement of VCM in both patterns are 2.247 m in 105 days (square pattern) and 2.252 m in 90 days (triangular pattern). It means with a triangular pattern has 70.2 more effective than others in the rate of the settlement period. It also showed the VCM has larger than others in volume settlements. The results of 2 scenarios analysis showed that the implementation of scenario one was difficult due to various spacing, while scenario two can be implemented because numbers of settlements depend on suction pressure of the vacuum.

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A pilot test on a membraneless vacuum preloading method

Cited by 28 publications

References 20 publications

Plane‐strain model for large strain consolidation induced by vacuum‐assisted prefabricated horizontal drains

Plane‐strain model for large strain consolidation induced by vacuum‐assisted prefabricated horizontal drains

Recent Developments in the Vacuum Preloading Technique in China

The Effectiveness of Vacuum Consolidation to Soft Soil Settlement

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