Evaluation of Strength Characteristics of Miscellaneous Fill Foundation

The structure of miscellaneous fill foundation is complex. The determination of its mechanical properties and parameters is of great significance to engineering construction. This paper takes the miscellaneous fill foundation in Zhengzhou Rongchuang Xinmi Yinji North Project as an example, and the consolidated drained test is carried out on miscellaneous fill soil samples under the action of various confining pressures. The experimental results reveal that the mechanical factors of the soil sample are almost similar to those of the silty sand, and its stress-strain relationship follows the hyperbolic relationship for monotonic loading. Based on the nonlinear elastic constitutive model, the bulk modulus is also introduced to obtain the tangent deformation modulus and tangent Poisson's ratio under the action of monotonic loading. In continuing, an appropriate nonlinear elastic constitutive relation of the miscellaneous fill is established, and the experimental test method is employed to assess the model parameters. The analysis of the obtained results indicates that the initial modulus of various fill increases with the growing depth, and the tangential deformation modulus lessens with increasing load. The initial Poisson's ratio reduces with increasing depth, and the tangential Poisson's ratio grows with increasing load.