纤维加筋淤泥固化土的黏-弹-塑性本构模型

为改善水泥基淤泥固化土的强度、变形和稳定性，拓宽固化土在实际工程中的应用场景，采用聚丙烯短纤维与水泥为原材料共同制备纤维加筋淤泥固化土样，通过一系列室内三轴不排水剪切试验研究不同纤维掺量和不同围压情况下的应力-应变响应特征。结果表明，纤维加筋显著改善了固化土的破坏模式，峰值强度和黏聚力呈现幂函数型增长，破坏应变略有增大，内摩擦角基本保持不变。根据实测数据和回归分析方法，引入Popovics模型并进行修正，建立一种可以反映固化土应变软化的黏-弹-塑本构模型，为合理设计纤维加筋淤泥固化土构筑物提供参考依据。

Viscosity-elastic-plastic Constitutive Model of Fiber-reinforced Silt-solidified Soil

In order to improve the strength, deformation and stability of cement-based silt-solidified soil and broaden the application scenarios of solidified soil in practical engineering, fiber reinforced silt-solidified soil samples were prepared with polypropylene staple fiber and cement as raw materials. A series of indoor triaxial undrained shear tests were conducted to study the stress-strain response characteristics of different fiber contents and confining pressures. The results show that the fiber reinforcement significantly improves the failure mode of the solidified soil. The peak strength and cohesion increase as a power function, the failure strain increases slightly, and the internal friction angle remains unchanged. According to the measured data and regression analysis method, Popovics model was introduced and modified, and a viscose-elastic-plastic constitutive model was established to reflect the strain softening of solidified soil, which provides a reference for the reasonable design of fiber reinforced silt solidified soil structures.