Triaxial tension and compression tests on saturated lime-treated plastic clay upon consolidated undrained conditions  

作　　者：Kuchvichea Kan Bertrand François 

机构地区：[1]Department of Civil Engineering,Institute of Technology of Cambodia,Phnom Penh,Cambodia [2]BATir Department,UniversitéLibre de Bruxelles,Brussels,Belgium [3]ArGEnCo Departement,Universitéde Liège,Liège,Belgium

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第12期3328-3342,共15页岩石力学与岩土工程学报（英文版）

摘　　要：Lime-treatment of clayey soil significantly increases its shear and tensile strengths.Consequently,the tensile strength of lime-treated soils deserves careful investigation because it may provide an appreciable benefit for the stability of earth structures.This study investigates the tensile and shear strengths of an untreated and lime-treated(3%of lime)plastic clay at different curing times(7 d,56 d and 300 d),through triaxial tension and compression tests.Triaxial tension tests are performed using“diabolo-shaped”soil samples with reduced central section,such that the central part of the specimen can be under axial tension while both end-sections remain in axial compression.Consolidated undrained(CU)conditions with measurement of pore water pressure allow analyzing the failure conditions through effective stress and total stress approaches.The results of triaxial tension tests reveal that the failure occurs under tensile mode at low confining pressure while extensional shear failure mode is observed under higher confining pressure.Consequently,a classical Mohr-Coulomb shear failure criterion must be combined with a cut-off tensile strength criterion that is not affected by the confining pressure.When comparing shear failure under compression and tension,a slight anisotropy is observed.

关 键 词：Tensile strength Consolidated undrained(CU)triaxial test Lime-treated soils Failure criterion 

分 类 号：TU43[建筑科学—岩土工程]