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本文介绍了用人工制备的超固结粘土试样进行的试验研究成果。试验证明:在临界状态“湿”边范围内,塑性应变增量的矢量与试样的初始状态无关。以等塑性体应变为硬化参数的屈服条件具有唯一性,塑性势函数等于屈服函数,流动法则为相适应的。在临界状态“干”边范围内,采用等塑性剪应变为硬化参数的屈服条件代替了一般以破坏条件为屈服条件的假定,从而能够反映超固结粘土的应变硬化一软化特性。最后得出了统一的屈服条件。
This paper describes the experimental research results of artificially prepared ultra-consolidated clay specimens. Tests have shown that the vector of the plastic strain increment is independent of the initial state of the specimen within the boundary of the “wet” side of the critical state. The yield conditions with isoplastic strain as the hardening parameter are unique, the plastic potential function is equal to the yield function, and the flow law is adaptable. In the boundary of the “dry” edge of the critical state, the assumption that the equivalent plastic deformation condition is the yield condition is used instead of the yield condition in which the isoplastic shear stress is the hardening parameter, and the strain hardening-softening behavior of the overconsolidated clay can be reflected. Finally, a unified yield condition was obtained.