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INHERENT ANISOTROPIC UNIFIED HARDENING MODEL FOR SOILS
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摘要: 通过将一种各向异性参数引用到统一硬化模型中,建立能够考虑土的原生各向异性的统一硬化模型。该模型采用将各向异性土体的应力变换为等效各向同性土体的应力方法,来实现各向异性的同性化,以考虑土的原生各向异性特性。各向异性参数可以由具有原生各向异性土的三轴试验获得。通过对日本丰浦砂试验数据的预测,表明了砂土原生各向异性统一硬化模型可以合理地描述具有原生各向异性砂土的变形特性、强度特性及其剪胀性。Abstract: An inherent anisotropic unified hardening model for soils was presented using an anisotropic parameter .The inherent anisotropy of soils can be processed as isotropy transforming its stresses into the equivalent isotropic soil. Parameter can be obtained from the conventional triaxial compression tests and triaxial extension tests of the inherent anisotropic soils.The model is well demonstrated by comparison of the predicted stress-strain curve and test results of Toyoura sand under different stress conditions.
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Key words:
- soil /
- anisotropy /
- transformed stress /
- constitutive model
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[2] Dafalias Y F,Papadimitriou A G,Li X S.Sand Plasticity Model Accounting for Inherent Fabric Anisotropy.Journal of Engineering Mechanics,ASCE,2004,130(11):1 319-1 333 Oda M.Initial Fabric and Their Relations to Mechanical Properties of Granular Materials.Soils and Foundations,1972,12(1):17-36 [3] 杨林德,张向霞.砂的原生各向异性强度的研究.地下空间与工程学报,2007,3(1):14-18 [4] Matsuoka H,Nakai T,Ishizaki H.A Stress-Strain Relationship for Anisotropic Soils Based on Spatial Mobilized Plane//Proc.of JSCE,1980,304:105-111 [5] Matsuoka H,Yao Y P,Sun D A.The Cam-Clay Models Revised by the SMP Criterion.Soils and Foundations,1999,39(1):81-95 [6] 姚仰平,路德春,周安楠.岩土类材料的变换应力空间及其应用.岩土工程学报,2005,27(1):24-29 [7] 姚仰平,罗汀,孙德安,等.黏土和砂土简单的三维本构模型.岩土工程学报,2002,24(2):240-246 [8] 罗汀,姚仰平.岩土材料应力路径无关硬化参量的构成方法.岩土力学,2007,28(1):69-76 -
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