Ground Deformation Induced by Vacuum Consolidation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 131, Issue 12
Abstract
The deformation characteristics of soil subjected to vacuum pressure are discussed and an approximate method is proposed for calculating settlement and lateral displacement of the ground induced by vacuum consolidation. Laboratory oedometer test results indicate that if the vacuum pressure alone is larger than the lateral stress required to maintain an at-rest (no horizontal strain) condition, there will be inward lateral displacement and the vacuum pressure will induce generally less settlement than a surcharge load of the same magnitude. In the case of field vacuum consolidation, the confining stress acting on a soil element can be regarded as consisting of two parts: Due to vacuum pressure and earth pressure. Assuming a value of the lateral earth pressure coefficient acting in the ground under vacuum consolidation , somewhere between the active and at-rest values, an equation defining the depth—below which there will be no significant inward lateral displacement—is derived. Further, assuming that the volumetric strain induced by vacuum consolidation is the same as the one-dimensional consolidation induced by application of a surcharge load of the same magnitude, an approximate method is proposed for calculating the ground settlement and inward lateral displacement induced by vacuum consolidation. This method has been applied to two case histories reported in the literature, and it is shown that the field-measured data are simulated reasonably well, suggesting that the method may be useful for the design of vacuum consolidation projects.
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Acknowledgment
The work reported in this technical note is a part of a large grant research project entitled, “Technological Development for Bottom Sediment Improvement and Benthos Restoration in Ariake Sea” funded by Bio-oriented Technology Research Advancement Institution (BRAIN), Japan.
References
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© 2005 ASCE.
History
Received: Feb 3, 2005
Accepted: May 6, 2005
Published online: Dec 1, 2005
Published in print: Dec 2005
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