Improvement of ultra-soft soil using prefabricated vertical drains
A case study of using prefabricated vertical drains (PVDs) to accelerate the consolidation of an ultra-soft fine-grained soil with high moisture content for a land reclamation project is described in this paper. Large-scale laboratory model tests were carried out to assess the suitability of the sel...
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| Published in | Geotextiles and geomembranes Vol. 24; no. 6; pp. 339 - 348 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
01.12.2006
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| Subjects | |
| Online Access | Get full text |
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| Abstract | A case study of using prefabricated vertical drains (PVDs) to accelerate the consolidation of an ultra-soft fine-grained soil with high moisture content for a land reclamation project is described in this paper. Large-scale laboratory model tests were carried out to assess the suitability of the selected PVD and the effectiveness of the PVD in the consolidation of the ultra-soft soil. The model tests indicate that the discharge capacity of the drain can decrease substantially after the drain has experienced large deformations. To overcome this problem, PVDs were installed in two rounds. The first round was before the application of surcharge, and the second round was after substantial settlements have taken place. Field instrumentations were utilized to monitor the performance of PVDs during consolidation. The monitored settlement and pore water pressure results are presented and discussed. The study shows that it is effective to use PVD for the consolidation of the ultra-soft soil if special care has been taken in selection and installation of PVD and in fill placement to overcome the difficulties involved in the consolidation of ultra-soft soil. |
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| AbstractList | A case study of using prefabricated vertical drains (PVDs) to accelerate the consolidation of an ultra-soft fine-grained soil with high moisture content for a land reclamation project is described in this paper. Large-scale laboratory model tests were carried out to assess the suitability of the selected PVD and the effectiveness of the PVD in the consolidation of the ultra-soft soil. The model tests indicate that the discharge capacity of the drain can decrease substantially after the drain has experienced large deformations. To overcome this problem, PVDs were installed in two rounds. The first round was before the application of surcharge, and the second round was after substantial settlements have taken place. Field instrumentations were utilized to monitor the performance of PVDs during consolidation. The monitored settlement and pore water pressure results are presented and discussed. The study shows that it is effective to use PVD for the consolidation of the ultra-soft soil if special care has been taken in selection and installation of PVD and in fill placement to overcome the difficulties involved in the consolidation of ultra-soft soil. |
| Author | Bo, M.W. Chu, J. Choa, V. |
| Author_xml | – sequence: 1 givenname: J. surname: Chu fullname: Chu, J. email: cjchu@ntu.edu.sg organization: School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Blk N1, #01A-10, Singapore 639798, Singapore – sequence: 2 givenname: M.W. surname: Bo fullname: Bo, M.W. organization: Faber Maunsell Ltd., 11/12 Eldon Place, Bradford BD1 3AZ, UK – sequence: 3 givenname: V. surname: Choa fullname: Choa, V. organization: Office of Admissions, Nanyang Technological University, 50 Nanyang Avenue, ADX-02-14, Singapore 639798, Singapore |
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| Keywords | Clay Consolidation Filter Land reclamation Soil improvement Prefabricated vertical drains Case history |
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| SubjectTerms | Case history Clay Consolidation Filter Land reclamation Prefabricated vertical drains Soil improvement |
| Title | Improvement of ultra-soft soil using prefabricated vertical drains |
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