Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading
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...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/150793 |
| _version_ | 1826116952848859136 |
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| author | Ni, Pengpeng Xu, Kai Mei, Guoxiong Zhao, Yanlin |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Ni, Pengpeng Xu, Kai Mei, Guoxiong Zhao, Yanlin |
| author_sort | Ni, Pengpeng |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T04:19:50Z |
| format | Journal Article |
| id | ntu-10356/150793 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:19:50Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1507932021-06-08T08:42:43Z Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading Ni, Pengpeng Xu, Kai Mei, Guoxiong Zhao, Yanlin School of Civil and Environmental Engineering Engineering::Computer science and engineering Geosynthetics Vacuum and Surcharge Preloading 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. 2021-06-08T08:42:43Z 2021-06-08T08:42:43Z 2019 Journal Article 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. https://dx.doi.org/10.1016/j.geotexmem.2018.09.004 0266-1144 https://hdl.handle.net/10356/150793 10.1016/j.geotexmem.2018.09.004 2-s2.0-85054162413 1 47 12 22 en Geotextiles and Geomembranes © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Computer science and engineering Geosynthetics Vacuum and Surcharge Preloading Ni, Pengpeng Xu, Kai Mei, Guoxiong Zhao, Yanlin Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading |
| title | Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading |
| title_full | Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading |
| title_fullStr | Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading |
| title_full_unstemmed | Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading |
| title_short | Effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading |
| title_sort | effect of vacuum removal on consolidation settlement under a combined vacuum and surcharge preloading |
| topic | Engineering::Computer science and engineering Geosynthetics Vacuum and Surcharge Preloading |
| url | https://hdl.handle.net/10356/150793 |
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