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| DOUBLE HARDENING CHARACTERISTICS OF SAND AND ITS ELASTOPLASTIC CONSTITUTIVE MODEL |
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical
and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Shenzhen Metro Co.， Ltd.，Shenzhen，Guangdong 518026，China) |
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Abstract Based on the experimental results obtained from a series of high precision triaxial isotropic loading and unloading tests and plane strain compression tests along different stress paths on Toyoura sand，a modified plastic work volumetric hardening function is proposed under plane strain conditions. The modified plastic work shear hardening function is presented within the framework of double hardening. The modified plastic work shear-volumetric double hardening function is established，which is independent of stress path for Toyoura sand. On the basis of proposed modified plastic work double hardening function，an incremental type shear-volumetric double hardening elastoplastic stiffness matrix is deduced；then the constitutive model considering multiple influential factors on deformation and strength is established for Toyoura sand. The comparisons between the numerical and the experimental results show that the proposed double hardening constitutive model can reasonably simulate the deformation and strength characteristics of sand.
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Received: 07 September 2010
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2011, Vol. 30 
