Deformation characteristics of soil between prefabricated vertical drains under vacuum preloading

• Published in: Geotextiles and geomembranes Vol. 47; no. 6; pp. 798 - 802
• Main Authors: Wang, Peng, Han, Yanbing, Wang, Jun, Cai, Yuanqiang, Geng, Xueyu
• Format: Journal Article
• Language: English
• Published: Essex Elsevier Ltd 01.12.2019; Elsevier BV
• Subjects: Deformation; Dredging; Geochemistry; Geosynthetics; Lateral displacement; Model testing; Prefabricated vertical drains; Prefabrication; Slurries; Soil investigations; Soil permeability; Soil pile; Soil settlement; Soil suction; Soil testing; Soils; Studies; Vacuum preloading; Vacuum suction; Vacuum technology; Vertical drains; Soil pile; Geosynthetics; Lateral displacement; Prefabricated vertical drains; Vacuum suction; Vacuum preloading
• ISSN: 0266-1144; 1879-3584
• DOI: 10.1016/j.geotexmem.2019.103493

The deformation characteristics of soil among prefabricated vertical drains (PVDs) subjected to vacuum pressure are investigated using a model test conducted on dredged slurry. Red iron particles are used to indirectly indicate the lateral displacement of soil under vacuum preloading. Test results showed that, in addition to the settlement of soil between two PVDs, there was also lateral displacement that varied with consolidation time and lateral distance from the PVD because of lateral vacuum suction. The lateral displacement arose successively with the increasing lateral distance. And it increased from zero on the PVD surface and dropped back to zero again at the midpoint between the two PVDs. There should have been a maximum value of the lateral displacement at a point near the PVD. The combined vertical and lateral displacement formed a soil pile around the PVD and showed a ‘V’ shaped soil surface.