Deformation Analysis in Soft Ground Improvement

Analytical solution and numerical simulation of vacuum consolidation by vertical drains beneath circular embankments

“…Figure 12 shows that if a 7.5 m high embankment is constructed without any vacuum pressure, then the entire horizontal displacement is outward with a maximum displacement close to 0.21 m. Application of the vacuum decreases the outward displacements and causes inward displacements in the soft clay (e.g. Chai et al, 2006, Chai andCarter, 2011). The maximum horizontal displacement after one year is 126 mm which occurs at a depth of 3.2 m below the surface.…”

Geotechnical Investigation for Resort Construction Using Resistivity and Granulometric Studies in Pattinamaruthur Coast, Southern India

“…The selected site is improved through the recent civil engineering technology which is ground improvement techniques. The available soft soil and ground compaction improved for civil construction was studied in the previous research (Topolnicki 2004;Arulrajah and Nikraz 2004;Hamidi et al 2009;Chai et al 2010;Chai and Carter 2011). Along with the study of geotechnical investigation the western part of the study area is covered by weathered gneissic rock.…”

Long-term reinforcement strains for column supported embankments with viscous reinforcement by FEM

“…Given Soil B, with a 2 m crust, was less compressive and stronger than Soil A without a crust, DMM columns installed in Soil B had a 3 m centre-to-centre spacing giving an area replacement ratio of 8.7% (defined as the ratio of the cross-sectional area of a column to the total cross-sectional area of the zone improved by a single column) while columns installed in Soil A had a 2 m centreto-centre spacing giving an area replacement ratio of 20%. These parameters were adopted based on the equivalent improvement ratios in a Japanese field case (Chai et al, 2010) and the typical ranges suggested by Chai and Carter (2011).…”

“…Columns installed by the deep-mixing-method (DMM) have been widely acknowledged as a cost-effective and speedy means of supporting roadway embankments constructed over soft soil (e.g., Bergado et al, 1999;Lin and Wong, 1999;Igaya et al, 2011;Chai and Carter, 2011;Jamsawang et al, 2011;Voottipruex et al, 2011a;Chandra, 2012;Dahlstr€ om and Wiberg, 2012;Kamruzzaman et al, 2012;Bruce et al, 2013;Chai et al, 2015;Liu et al, 2015). To minimize column construction costs and improve embankment stability, geosynthetic reinforcement is increasingly used as basal reinforcement in combination with columns to control embankment deformations including both vertical and horizontal displacements (e.g., Forsman et al, 1999;Parmantier et al, 2005;Lai et al, 2006;Pooranampillai et al, 2012;Borges and Gonçalves, 2016;Chen et al, 2016;Zhang et al, 2016).…”