Numerical Simulation of Triaxial Compression Stress Paths Tests for Unsaturated Soil

 

Dong Jian-jun

Key Laboratory Of Mechanical Reliability For Heavy Equipments And Large Structures of Hebei Province, Yanshan University, Qinhuangdao 066004, China; College of Civil Engineering & Machenics, Yanshan University, Qinhuangdao 066004, Chinae-mail: dongjianju

 

 ABSTRACT

With respect to saturated soil, the study of triaxial compression stress paths for unsaturated soil under suction-controlled condition is more complex. With the continuous development of unsaturated soil constitutive theory, the results of abundant academic and test researches indicate that, the strength and deformation behaviours of unsaturated soil can be approximately described by elasto-plastic constitutive model of unsaturated soil. Therefore, it is an effectual academic research method adopting elasto-plastic constitutive model of unsaturated soil that numerically simulates three types of triaxial compression stress paths tests for unsaturated soil under suction-controlled condition. Using Barcelona model can well numerically simulate such experiments, and the research results demonstrate that, under suction-controlled condition, the stress paths which in the triaxial compression stress states have important influence on strength and deformation behaviours of unsaturated soil.

Keywords: Stress paths; unsaturated soil; elasto-plastic; triaxial compression; numerical simulation.

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