Experimental and numerical study on the bearing capacity of encased stone columns

Abstract

Stone columns have attracted considerable attention as a ground improvement techniques recently. Performance of stone columns, however, depends on confining pressure offered by the surrounding soils. In the case of very soft soils, the lateral confining pressure may be insufficient and this may lead to column bulging failure. Encapsulating the individual stone column enhances the lateral resistance against bulging by additional confining pressure. In this study, the influences of the length of encasement and type of aggregate materials on the bearing capacity of a single stone column in both dry sand and clay bed were investigated. The results indicated a clear improvement by encasing the half-length of the column. The numerical study also showed the effect of reinforcement stiffness reduces with increase in the cohesion of the clay. Parametric study showed that the effect of encasement stiffness is insignificant for clay bed with high values of cohesion.

Behavior of an Embankment on Stone Column-Reinforced Soft Soil

“…The geotechnical engineering program, Finite Element Package (Plaxis 2D V21), was used to analyze the behavior of an embankment on soft soil. Several researchers have extensively used it to analyze various geotechnical problems (Rajesh and Jain, 2015;Lo et al, 2010;Hataf et al, 2020). As stated in Tab.…”

The Effect of Using Reinforced Granular Blanket and Single Stone Column on Improvement of Sandy Soil: Experimental Study

“…As a result, the stone column bulges and pushes the surrounding soil radially, reducing efficiency. Hence, studies have tried to employ various geosynthetics to reinforce the stone column and provide confining pressure around it [6][7][8][9][10][11][12], and reduce stress concentration at the column's top by placing a reinforced granular blanket [13,14]. In response to this improvement, the stone column can take vertical loads and reduce bulging.…”

Improving weak soils with reinforced stone columns

“…Researchers found that encapsulating the upper portion of a stone column at 2.5 D (D) the pillar's diameter has demonstrated its usefulness in this field, resulting in a precipitation reduction of up https://doi.org/10.17993/3ctecno.2023.v12n2e44.78-91 to 50%. (18,19). The encasement, which has several advantages, further restrains the stone column.…”