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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 soil yield function are summarized. Taking the Cambridge model and the modified Cambridge model as examples, the concrete steps of yield function obtained by the method of stress dilatancy and thermodynamics are described in detail. The advantages and disadvantages of these six methods are analyzed. It is found that the stress dilatancy method, the plastic strain increment method and the thermodynamic method are all essentially derived from the “equivalent” of the yield function, but only the “equivalent” Different forms, respectively, the algebra, geometry and energy form of the equivalent relationship. Finally, using the analogy of destructive function, based on the results of conventional triaxial test and true triaxial test of coarse grained soil, a yield criterion of coarse grained soil shear was established.