Model tests on geotextile-encased granular columns under 1-g and undrained conditions

摘要: Abstract This paper investigates the effects of encasement stiffness and strength on response individual geotextile encased granular columns embedded in soft soil through model tests. Similarity analysis was first executed to determine suitable properties constituents used tests ensure that prototype-scale model-scale exhibit comparable behaviour. Experimental results show improves bearing capability all modelled sand columns, even when rupture occurs; marked improvement is achieved for with geotextiles relatively medium high stiffness. Encasement also restrains radial strain significantly. Predominate bulging column occurs top 2.5D depth low geotextile, however, roughly uniform lateral deformation along height column. The stresses this study agree well values predicted by an analytical solution using cavity expansion theory.