A shape hardening function is developed that improves the predictive capabilities of the generalized bounding surface model for cohesive soils, especially when applied to overconsolidated specimens. This improvement i...A shape hardening function is developed that improves the predictive capabilities of the generalized bounding surface model for cohesive soils, especially when applied to overconsolidated specimens. This improvement is realized without any changes to the simple elliptical shape of the bounding surface, and actually reduces the number of parameters associated with the model by one.展开更多
A 3D bounding surface model is established for rockfill materials,which can be applied to appropriately predict the deformation and the stabilization of rockfill dams.Firstly,an associated plastic flow rule for rockfi...A 3D bounding surface model is established for rockfill materials,which can be applied to appropriately predict the deformation and the stabilization of rockfill dams.Firstly,an associated plastic flow rule for rockfill materials is investigated based on the elaborate data from the large-style triaxial compression tests and the true triaxial tests.Secondly,the constitutive equations of the 3D bounding surface model are established by several steps.These steps include the bounding surface incorporating the general nonlinear strength criterion,stress-dilatancy equations,the evolution of the bounding surface and the bounding surface plasticity.Finally,the 3D bounding surface model is used to predict the mechanical behaviors of rockfill materials from the large-style triaxial compression tests and the true triaxial tests.Consequently,the proposed 3D bounding surface model can well capture such behaviors of rockfill materials as the strain hardening,the post-peak strain softening,and the volumetric strain contraction and expansion in both two-and three-dimensional stress spaces.展开更多
介绍一个用于流动液化变形分析的临界状态砂土模型.该模型的参量与应力和材料状态无关,模型能自动处理材料因过程发展而产生的各种状态变化.对于一种或几种类似的土,参量一经率定,不论材料初始处在松的可液化状态还是紧的剪胀状态,模型...介绍一个用于流动液化变形分析的临界状态砂土模型.该模型的参量与应力和材料状态无关,模型能自动处理材料因过程发展而产生的各种状态变化.对于一种或几种类似的土,参量一经率定,不论材料初始处在松的可液化状态还是紧的剪胀状态,模型以统一方式模拟材料从起始阶段近似弹性的响应直到趋于临界状态破坏,包括流动液化在内的全程响应,无需在分析过程中人为干预调整模型参量.作者利用完全耦合有限元分析程序SUMDES2D,以Upper San Fernando土坝在1971年地震中的分析为例,示范该模型在流动液化变形分析中的应用.展开更多
基金supported by the Fulbright Colombia-Colciencias Scholarship and Universidad Militar Nueva Granada
文摘A shape hardening function is developed that improves the predictive capabilities of the generalized bounding surface model for cohesive soils, especially when applied to overconsolidated specimens. This improvement is realized without any changes to the simple elliptical shape of the bounding surface, and actually reduces the number of parameters associated with the model by one.
基金supported by the National Natural Science Foundation for Distinguished Young Scholar (Grant No. 50825901)the Key Project of National Natural Science Foundation of China and Yalongjiang Hydro-electric Development Joint Research Fund (Grant No. 50639050)+2 种基金the Public Service Sector R&D Project of Ministry of Water Resource of China(Grant No. 200801014)the Fundamental Research Funds for the Central Universities (Grant No. 2010B15014)Scientific Innovation Research Scheme for Jiangsu University Graduate (Grant No. CX10B_207Z)
文摘A 3D bounding surface model is established for rockfill materials,which can be applied to appropriately predict the deformation and the stabilization of rockfill dams.Firstly,an associated plastic flow rule for rockfill materials is investigated based on the elaborate data from the large-style triaxial compression tests and the true triaxial tests.Secondly,the constitutive equations of the 3D bounding surface model are established by several steps.These steps include the bounding surface incorporating the general nonlinear strength criterion,stress-dilatancy equations,the evolution of the bounding surface and the bounding surface plasticity.Finally,the 3D bounding surface model is used to predict the mechanical behaviors of rockfill materials from the large-style triaxial compression tests and the true triaxial tests.Consequently,the proposed 3D bounding surface model can well capture such behaviors of rockfill materials as the strain hardening,the post-peak strain softening,and the volumetric strain contraction and expansion in both two-and three-dimensional stress spaces.
文摘介绍一个用于流动液化变形分析的临界状态砂土模型.该模型的参量与应力和材料状态无关,模型能自动处理材料因过程发展而产生的各种状态变化.对于一种或几种类似的土,参量一经率定,不论材料初始处在松的可液化状态还是紧的剪胀状态,模型以统一方式模拟材料从起始阶段近似弹性的响应直到趋于临界状态破坏,包括流动液化在内的全程响应,无需在分析过程中人为干预调整模型参量.作者利用完全耦合有限元分析程序SUMDES2D,以Upper San Fernando土坝在1971年地震中的分析为例,示范该模型在流动液化变形分析中的应用.
