›› 2010, Vol. 31 ›› Issue (2): 407-415.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A modified ALPHA model based on subloading surface theory and its numerical implementation

ZHAN Yun-gang1, YUAN Fan-fan2, LUAN Mao-tian3, 4   

  1. 1. School of Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 4. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2008-08-18 Online:2010-02-10 Published:2010-03-24

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Abstract:

ALPHA model is modified based on subloading surface theory; and the initial anisotropy induced by settlement is also considered. Considering the characters of the modified model, a semi-implicit constitutive integration algorithm is proposed. In terms of the algorithm, a user material subroutine is developed in the framework of general-purpose finite element code ABAQUS. Using the subroutine, simulations for triaxial tests are performed; and the results have been compared with the published studies. The comparison shows that the presented algorithms are capable of the numerically implementing of complicated constitutive model; and the modified ALPHA model, which overcomes the deficiencies of modified Cam-Clay model, such as predicting higher peak strength for over consolidated clay and assuming elastic deformation inside the initial yield surface, can depict the nonlinear and nonrecoverable deformation before yielding. Through varying model parameters, more complicated deformation behaviors can be simulated by the modified model.

Key words: ALPHA model, subloading surface theory, semi-implicit constitutive integration algorithm, ABAQUS

CLC Number: 

  • TU 44
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