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纤维加筋土具有较好的应用前景,其应力应变本构关系是工程分析与设计的基础。将纤维加筋土考虑为基本相和纤维相的组合体,分别采用修正剑桥模型和线弹性模型,考虑了大应变时纤维加筋土的屈服,引入了加筋土的合理强度模型作为破坏准则,从而建立了纤维加筋土的一种两相本构模型。同时,开展了纤维体积含量为1%的加筋砂的三轴固结排水剪切试验,对该两相本构模型进行了验证。
Fiber reinforced earth has good application prospects, and its constitutive relationship of stress and strain is the basis of engineering analysis and design. Considering the fiber reinforced earth as a combination of the basic phase and the fiber phase, the modified Cambridge model and the linear elastic model were used respectively. The yield of fiber reinforced earth under large strain was considered and the reasonable strength model of reinforced earth was introduced as the failure criterion , So as to establish a two-phase constitutive model of fiber-reinforced soil. At the same time, triaxial consolidation drainage and shearing test of reinforced sand with fiber volume content of 1% was carried out, and the two-phase constitutive model was verified.