Geogrid reinforced concealed karst collapse roadbed model test device and test method

The invention provides a geogrid reinforced concealed karst collapse roadbed model test device and a test method, belongs to the technical field of ground soil cave collapse hazard detection equipment, and aims to manufacture geogrid models with different transverse rib thicknesses based on a 3D printing technology. The influence of different transverse rib thicknesses and vertical stress on the direct shear characteristic of the grid net interface is analyzed through an indoor large-scale direct shear test; the influence of the thickness of the enhanced transverse rib on the passive side resistance in a shear mode is discussed, the influence of the shear characteristic of a geogrid net rib soil interface is studied, and the self-sensing geogrid is applied to a model test of an underlying soil cave roadbed. The ultimate bearing capacity, top end settlement and rib deformation characteristics of the roadbed under different reinforcement layer numbers and reinforcement intervals are studied. According to the me