土体各向异性弹塑性模型的改进  

Modification of elastic-plastic anisotropic constitutive models for soil

作　　者：张坤勇[1] 陈芸[2] 梅国雄[3] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098 [2]南京工业大学建筑与城市规划学院,江苏南京210009 [3]南京工业大学土木工程学院,江苏南京210009

出　　处：《水利水电科技进展》2006年第6期51-53,57,共4页Advances in Science and Technology of Water Resources

基　　金：江苏省青年科技创新人才基金资助项目(BK2003418);霍英东青年教师基金资助项目(91076)

摘　　要：指出剑桥模型不能反映具有初始各向异性的天然地基的变形特性;关口太田模型通过采用新的应力比,能从一定程度上反映初始各向异性。在修正剑桥模型和关口太田模型的基础上,对p-q平面上的硬化轴和屈服轨迹形状再次调整得到改进模型。分别采用剑桥模型、修正剑桥模型、关口太田模型及修正关口太田模型对地基变形进行有限元数值分析,在计算结果的基础上对各种模型所形成的柔度矩阵进行比较,验证了改进模型的有效性。In consideration of the fact that the Cam-Clay model is incapable of reflecting the defonnalion characteristics of initially anisotropic soil, and that the Ohta-Sekiguchi model can reflect the initial anisotropy of soil to some extent by adoption of a new stress ratio, the two models are modified by readjustment of the yielding locus and hardening axis in p-q plane. Then, the Cam-Clay model, the modified Cam-Clay model, the Ohta-Sekiguchi model, and the modified Ohta-Sekiguchi model are applied to analysis of soil＇ foundation deformation with FEM. The flexibility matrixes of the above four models are compared, and the effectiveness of the modified models is verified.

关 键 词：剑桥模型 关口太田模型 初始各向异性 柔度矩阵 

分 类 号：TU43[建筑科学—岩土工程]