Fitting degree test method for predicting settlement of subway tunnel passing through pile foundation and roadbed

The present invention discloses a fitting degree test method for predicting settlement of a subway tunnel passing through a pile foundation and a roadbed. The method is characterized in that: a three-dimensional finite element model of a 100-m test section of a subway tunnel is established, and the width directions are 2.5-3.5 times of the tunnel diameter according to the left-right range outsidethe structure, and 4.5-5 times of the tunnel diameter below the floor of the section tunnel structure; the surrounding rock set by the three-dimensional finite element model is an ideal elastoplasticmaterial, and follows the Mohr-Coulomb yield criterion; the unit types of the three-dimensional finite element model all adopt 8-node hexahedral three-dimensional solid elements and 4-node tetrahedralthree-dimensional solid elements; the shield tunnel segments are simulated by using the ABAQUS built-in Shell structural unit; and the fitting degree test for accurate settlement prediction is performed. The method disclosed b