Modeling of ratcheting accumulation of secondary deformation due to stress-controlled high-cyclic loading in granular soils
来源期刊：中南大学学报(英文版)2015年第6期
论文作者：JIA Peng-fei KONG Ling-wei
文章页码：2306 - 2315
Key words：ratcheting accumulation; secondary deformation; response envelope; high-cyclic loading; granular soils
Abstract: An objective of this work is to develop a validated computational model that can be used to estimate ratcheting accumulation behavior of granular soils due to high-cyclic loading. An accumulation model was proposed to describe only the envelope of the maximum plastic deformations generated during the cyclic loading process, which can calculate the accumulated deformation by means of relatively large load cycle increments. The concept of volumetric hardening was incorporated into the model and a so-called overstress formulation was employed to describe the evolution of the accumulated volumetric deformation as a state parameter. The model accounted for ratcheting shakedown and accumulation such as a pseudo-yield surface (a shakedown surface) associated with loading inside the current virgin yield surface which was implemented into the well-known modified Cam-clay model. Finally, the model was calibrated using data from the stress-controlled drained cyclic triaxial tests on homogeneous fine grained sands. It is seen that the model can successfully represent important features of the ratcheting accumulation of both volumetric and deviatoric deformation caused by repeated drained loading over a large number of cycles.
JIA Peng-fei(贾鹏飞)1, KONG Ling-wei(孔令伟)2
(1. State Key Laboratory of Continental Dynamics (Northwest University), Xi’an 710069, China;
2. State Key Laboratory of Geomechanics and Geotechnical Engineering (Institute of Rock and Soil Mechanics,
Chinese Academy of Sciences), Wuhan 430071, China)
Abstract:An objective of this work is to develop a validated computational model that can be used to estimate ratcheting accumulation behavior of granular soils due to high-cyclic loading. An accumulation model was proposed to describe only the envelope of the maximum plastic deformations generated during the cyclic loading process, which can calculate the accumulated deformation by means of relatively large load cycle increments. The concept of volumetric hardening was incorporated into the model and a so-called overstress formulation was employed to describe the evolution of the accumulated volumetric deformation as a state parameter. The model accounted for ratcheting shakedown and accumulation such as a pseudo-yield surface (a shakedown surface) associated with loading inside the current virgin yield surface which was implemented into the well-known modified Cam-clay model. Finally, the model was calibrated using data from the stress-controlled drained cyclic triaxial tests on homogeneous fine grained sands. It is seen that the model can successfully represent important features of the ratcheting accumulation of both volumetric and deviatoric deformation caused by repeated drained loading over a large number of cycles.
Key words:ratcheting accumulation; secondary deformation; response envelope; high-cyclic loading; granular soils
