›› 2011, Vol. 32 ›› Issue (S1): 230-235.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Non-coaxial constitutive modeling of sands based on critical state model

HU Ping1, HUANG Mao-song2, 3, MA Shao-kun4, QIN Hui-lai5   

  1. 1. School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 4. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 5. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing 100048, China
  • Received:2011-11-12 Online:2011-05-15 Published:2011-05-16

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Abstract:

Classical coaxial plasticity constitutive models implicate an inevitable limitation that directions for principal stress and that for principal plastic strain rate are always coaxial; so they are not capable of simulating non-coaxial phenomena during the rotation of principal stress axis. And they are not suitable for the conditions which the density of the sand and the confining pressure are changed on a large scale. In this paper, the sand model put forward by Pietruszczak and Stolle(1987) is modified based on the existing state-dependent critical state conception of sand; and the non-coaxial plasticity theory is introduced to describe the non-coaxial behavior under principal axes rotation. With a series of numerical simulations of simple shear and hollow cylindrical torsional shear tests, it is shown that the non-coaxial model combined with critical state theory is able to simulate successfully the non-coaxial behavior of sands subjected to principal stress axis rotation

Key words: critical state, non-coaxial, simple shear, hollow cylinder, numerical simulation

CLC Number: 

  • TU 47
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