结构性黄土的修正剑桥模型  

Modified Cam-clay model of structured loess

作　　者：邓国华 邵生俊[2] 佘芳涛[2] 

机构地区：[1]西安市地下铁道有限责任公司,陕西西安710018 [2]西安理工大学水利水电学院,陕西西安710048

出　　处：《岩土工程学报》2012年第5期834-841,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(10872161)

摘　　要：天然岩土材料强度变形特性与其结构性密切相关。在综合结构势理论的框架内,将结构性参数合理地引入到修正剑桥模型中,来预测结构性土的力学特性。首先,分析天然岩土材料的压缩特性和结构性之间的关系,即建立结构性参数与准先期固结压力、压缩指数和回弹指数的关系;其次,分析结构性土的强度特性,提出随结构性参数变化的临界状态线;最后,将结构性参数引入修正剑桥模型,建立符合天然岩土材料强度和变形特性的结构性模型。经过初步验证,该模型可以较为准确地反映结构性土的强度变形规律。The strength and deformation characteristics of natural geotechnical materials are connected with the structure of soils. Based on the theoretical frame of comprehensive structure potential, a structural parameter is introduced into the modified Cam-clay model, and the mechanical characteristics of structured soils are forecast. Firstly, the relation between compression and structure is analyzed, in other words, it is established that preconsolidation pressure, compressive index and rebound index are related to the structural parameter. Secondly, the strength features of the structured soils are analyzed, then the critical condition line varying with structural parameter is put forward. Finally, by introducing the structural parameter into the modified Cam-clay model, a structural model according to the strength and deformation characteristics of natural geotechnical materials is developed. After preliminary validation, the proposed model can accurately indicate the strength and deformation laws of structured soils.

关 键 词：结构性 综合结构势 临界状态 修正剑桥模型 本构模型 

分 类 号：TU43[建筑科学—岩土工程]