Methods for establishing yield function of soils
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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。Abstract: 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.
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Keywords:
- elasto-plastic model /
- yield function /
- plastic potential /
- coarse-grained soils
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