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Title: Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading
Authors: Ni, Pengpeng
Xu, Kai
Mei, Guoxiong
Zhao, Yanlin
Keywords: Engineering::Computer science and engineering
Issue Date: 2019
Source: Ni, P., Xu, K., Mei, G. & Zhao, Y. (2019). Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading. Geotextiles and Geomembranes, 47(1), 12-22.
Journal: Geotextiles and Geomembranes
Abstract: The combined vacuum and surcharge preloading technique is extensively used to accelerate the consolidation process of subsoils. The effect of vacuum pressure is often considered as a loading/unloading cycle of mean effective stress, such that elastic rebound occurs after vacuum removal, which cannot explain the observed postconstruction settlement in the field. In this study, the stress state of subsoils subject to vacuum and surcharge preloading is analyzed and decomposed into two components: (a) geostatic consolidation at a different depth, and (b) loading/unloading in the minor principal stress direction. A series of consolidated drained triaxial tests is conducted to simulate the soil behaviour after vacuum removal. Results show that the contribution of unloading in the minor principal stress direction outweighs the magnitude of elastic rebound after vacuum removal, and hence continued settlement dominates. A field case for highways is provided to further demonstrate the proposed mechanism.
ISSN: 0266-1144
DOI: 10.1016/j.geotexmem.2018.09.004
Rights: © 2018 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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