建立土体屈服函数的方法研究  

Methods for establishing yield function of soils

作　　者：施维成[1] 朱俊高[2] 

机构地区：[1]常州工学院土木建筑工程学院,江苏常州213002 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《岩土工程学报》2010年第4期624-629,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50579014);国家自然科学基金委员会;二滩水电开发有限责任公司雅砻江水电开发联合基金项目(50639050);江苏省高校自然科学研究项目(09KJD560003);江苏省自然科学基金项目(BK2007582)

摘　　要：总结了建立土体屈服函数的6种方法,并以剑桥模型和修正剑桥模型为例,详细说明了使用应力剪胀关系法、热力学方法得到屈服函数的具体步骤。分析了这6种方法的优缺点,发现应力剪胀关系法、塑性应变增量法和热力学方法本质上都是由屈服函数的"等价物"来得到屈服函数,只是"等价物"的形式不同,分别为代数、几何和能量形式的等价关系。最后使用破坏函数类比法,在粗粒土常规三轴试验及真三轴试验结果的基础上,建立了一个粗粒土剪切屈服准则。Six methods for establishing the yield function of soils are summarized,and taking Cambridge Model and Modified Cambridge Model as examples,the approaches of the stress-dilatancy method and the thermodynamics method are explicated.The advantages and disadvantages of these methods are analyzed.It is found that the stress-dilatancy method,the plastic strain increment method and the thermodynamics method are the same in nature and all of the three methods need to establish yield functions from their ＂equivalents＂.The forms of the ＂equivalents＂ are the equivalent relations of algebraic,geometrical and energy aspects,respectively.Finally using the sixth method,a shear yield criteria for coarse-grained soils is proposed based on the results of conventional triaxial and true triaxial tests on these soils.

关 键 词：弹塑性模型 屈服函数 塑性势 粗粒土 

分 类 号：TU43[建筑科学—岩土工程]