Numerical Simulation Research on the Influence Factors of Geotextile Control of Subgrade Collapse

The influence factors of geotextile control of subgrade collapse were studied in this paper. To evaluate the influence of the subsidence width, tensile stiffness of geotextile and finite element software meshing three factors on subgrade subsidence treatment, finite element analysis was performed. The soil pressure, vertical deflection of the geotextile and soil settlement were analyzed. The results showed that the soil pressure, vertical deflection of the geotextile and soil settlement increased as the subsidence width increased. When an anchorage ratio
$L$
was equale or smaller than 0.5B, the geotextile was not suitable for treatment of a subgrade collapse. With the tensile stiffness of geotextile increased, the soil pressure increased, while vertical deflection of the geotextile and soil settlement decreased. It indicated that improving the tensile stiffness of geotextiles is improving safety of the structure. As the change of the finite element software meshing, the curves trend of the vertical deflection of the geotextile and soil settlement unchanged which indicated the effect of the finite element software meshing on model performance was neglectable.