A Pilot Test of Dehydration of Tiver dredged Mud using Vacuum Consolidation with Different Vertical Drains
Received: 5 August 2024 | Revised: 5 September 2024 | Accepted: 8 September 2024 | Online: 2 December 2024
Corresponding author: Nguyen Binh Phan
Abstract
The combination of vacuum preloading and vertical drains provides an effective approach to the usage of dredged slurry for reclamation. However, the efficacy of this approach in improving soil quality is often impeded by clogging, a prevalent issue that frequently arises in the vicinity of Prefabricated Vertical Drains (PVD) during vacuum preloading. In addition to numerous efforts aimed at improving the performance of vacuum systems, this study conducts a pilot test to explore innovations in vertical drain types, including PVD, Filter Pipes (FP), and Sand Drains (SD). The monitoring data indicate that the use of SD is advantageous in mitigating the effects of clogging and enhancing the performance of vacuum consolidation techniques. Specifically, after 160 days of vacuum operation, the volumetric strains of dredged mud reached approximately 30.2%, 27.1%, and 23.1% for SD, FP, and PVD, respectively. The treated dredged mud exhibited disparate enhancements in physical properties and strength, reflecting the differential impacts of clogging phenomena among the cases of vertical drains.
Keywords:
vacuum consolidation, land reclamation, dredged slurry, vertical drain, clogging effectDownloads
References
P. H. Dong, K. Hayano, Y. Kikuchi, H. Takahashi, and Y. Morikawa, "Deformation and Crushing of Particles of Cement Treat Granulate Soil," Soils and Foundations, vol. 51, no. 4, pp. 611–624, Aug. 2011.
F. Tatsuoka, K. Uchida, K. Imai, T. Ouchi, and Y. Kohata, "Properties of cement-treated soils in Trans-Tokyo Bay Highway project," Proceedings of the Institution of Civil Engineers: Ground Improvement, vol. 1, pp. 37–57..
S. R. Lo and S. P. Wardani, "Strength and dilatancy of a silt stabilized by a cement and fly ash mixture," Canadian Geotechnical Journal, vol. 39, no. 1, pp. 77–89, Feb. 2002.
S. Vichan and R. Rachan, "Chemical stabilization of soft Bangkok clay using the blend of calcium carbide residue and biomass ash," Soils and Foundations, vol. 53, no. 2, pp. 272–281, Apr. 2013.
S. Horpibulsuk, C. Phetchuay, A. Chinkulkijniwat, and A. Cholaphatsorn, "Strength development in silty clay stabilized with calcium carbide residue and fly ash," Soils and Foundations, vol. 53, no. 4, pp. 477–486, Aug. 2013.
H. Sellaf, H. Trouzine, M. Hamhami, and A. Asroun, "Geotechnical Properties of Rubber Tires and Sediments Mixtures," Engineering, Technology & Applied Science Research, vol. 4, no. 2, pp. 618–624, Apr. 2014.
J. Wang et al., "Improved Vacuum Preloading Method for Consolidation of Dredged Clay-Slurry Fill," Journal of Geotechnical and Geoenvironmental Engineering, vol. 142, no. 11, Nov. 2016, Art. no. 06016012.
Y. Cai, Z. Xie, J. Wang, P. Wang, and X. Geng, "New approach of vacuum preloading with booster prefabricated vertical drains (PVDs) to improve deep marine clay strata," Canadian Geotechnical Journal, vol. 55, no. 10, pp. 1359–1371, Oct. 2018.
D. H. Ngo et al., "Consolidation behavior of dredged ultra-soft soil improved with prefabricated vertical drain at the Mae Moh mine, Thailand," Geotextiles and Geomembranes, vol. 48, no. 4, pp. 561–571, Aug. 2020.
D. H. Ngo et al., "Full scale consolidation test on ultra-soft soil improved by prefabricated vertical drains in MAE MOH mine, Thailand," Geotextiles and Geomembranes, vol. 49, no. 1, pp. 72–80, Feb. 2021.
H. Lei, H. Lu, J. Liu, and G. Zheng, "Experimental Study of the Clogging of Dredger Fills under Vacuum Preloading," International Journal of Geomechanics, vol. 17, no. 12, Dec. 2017, Art. no. 04017117.
B.-H. Xu, N. He, Y.-B. Jiang, Y.-Z. Zhou, and X.-J. Zhan, "Experimental study on the clogging effect of dredged fill surrounding the PVD under vacuum preloading," Geotextiles and Geomembranes, vol. 48, no. 5, pp. 614–624, Oct. 2020.
X. Hu, W. Zhang, H. Fu, J. Wang, and J. Ni, "Clogging effect of prefabricated horizontal drains in dredged soil by air booster vacuum consolidation," Geotextiles and Geomembranes, vol. 49, no. 6, pp. 1529–1538, Dec. 2021.
J. Wang et al., "Experimental study on a dredged fill ground improved by a two-stage vacuum preloading method," Soils and Foundations, vol. 58, no. 3, pp. 766–775, Jun. 2018.
P. H. Dong and V. M. Quynh, "Performance of consolidation techniques for improvement of newly deposited dredged mud by scale model test," GEOMATE Journal, vol. 19, no. 76, pp. 134–140, Nov. 2021.
A. Asaoka, "Observational Procedure of Settlement Prediction," Soils and Foundations, vol. 18, no. 4, pp. 87–101, Dec. 1978.
Downloads
How to Cite
License
Copyright (c) 2024 Huy Dong Phan, Nguyen Binh Phan
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain the copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after its publication in ETASR with an acknowledgement of its initial publication in this journal.
