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Slurry improvement by vacuum preloading and electro-osmosis
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2018Vacuum preloading–electro-osmosis is one of the most useful ground improvement methods for soft soil but is not widely used in practical engineering because of its high power consumption and poor electro-osmotic efficiency in the later stages. To overcome these drawbacks, a new method – vacuum preloading with stepped-voltage electro-osmosis – is ...
Xiaobing Li +7 more
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Sustainable soil improvement via vacuum preloading
Proceedings of the Institution of Civil Engineers - Ground Improvement, 2010The application of prefabricated vertical drains combined with vacuum and surcharge preloading is considered to be one of the most environmentally friendly ground improvement techniques. The natural atmospheric pressure is used to generate suction via a vacuum pump.
Indraratna, Buddhima +3 more
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Numerical modeling of vacuum preloading and field applications
Canadian Geotechnical Journal, 2004This study describes the effect of unsaturation at a drain boundary on the behaviour of a single prefabricated vertical drain subjected to vacuum preloading based on a two-dimensional plane strain finite element model incorporating the modified CamClay model.
Indraratna, Buddhima +2 more
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The Environmental Protection Methods for Vacuum Preloading Project
2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, 2011Vacuum preloading is one of the effective technologies for consolidating soft foundation. The consolidation mechanism of vacuum preloading is explained. Meanwhile, the computing methods of vacuum preloading are classified, the advantages and disadvantages of the axial symmetry consolidation theory, the half analysis theory of horizontal movement and ...
Jun Yan +3 more
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Vacuum preloading methods: an update
2016The Geotechnical Engineering Journal of the SEAGS & AGSSEA, 47, 3, pp 62 ...
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Vacuum preloading consolidation of Yaoqiang Airport runway
Géotechnique, 2000Yaoqiang Airport is an international airport serving the city of Jinan, China. The soil on the site consists of alternate layers of silty sand, silty clay, silt and clay. An under-consolidated soft clay layer approximately 4 m thick is located at between 7·5 m and 11·5 m depth above a silty clay layer.
M. Tang, J. Q. Shang
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The Analysis of Vacuum-Surcharge Preloading Method with FLAC3D
Applied Mechanics and Materials, 2013Based on the test section on the expressway in Jiangsu, the thesis makes a model and then conducts numerical simulation on the settlement of soft soil subgrade by using FLAC3D. The author set the filling layer null, and assigns a value to the loaded soil layer according to the construction sequence to realize multi-stage loading.
Chun Yuan Liu +3 more
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Properties of soil after surcharge or vacuum preloading
Proceedings of the Institution of Civil Engineers - Ground Improvement, 2016This paper compares the results of laboratory studies carried out to determine the engineering properties, response under cyclic loading and the microstructure of soft clay after subjecting it to preloading by surcharge and vacuum. The samples for these tests were prepared at different initial consolidation pressures of 25, 50 and 100 kPa under K0 ...
Sridhar Gangaputhiran +2 more
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Final state of soils under vacuum preloading
Canadian Geotechnical Journal, 2012Vacuum preloading of clay deposits is becoming an increasingly popular ground improvement technique. Although many studies have been reported in literature, the mechanism of vacuum preloading is still not properly understood. Soil under vacuum preloading is expected to undergo an inward lateral deformation, therefore the influence of lateral ...
Robinson, Retnamony G +2 more
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Estimation of Degree of Consolidation for Vacuum Preloading Projects
International Journal of Geomechanics, 2005The degree of consolidation is usually used as one of the criteria for assessing the effectiveness of soil improvement work using the fill surcharge or vacuum preloading method. It is also often used as a design specification in a soil improvement contract. Degree of consolidation is normally calculated using settlement data.
J. Chu, S. W. Yan
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