Simulation study on settlement and deformation of highway subgrade in subsidence areas

Aiming at the settlement and deformation of the roadbed above the subsidence area,taking a shallowburied thick coal seam mining area in Huainan as the research background,similar simulations and numerical simulations are used to simulate the paving of different grades of roads above the subsidence area. It is planned to explore the settlement deformation of the roadbed in the subsidence area under unsupported conditions,and provide a corresponding theoretical basis for the construction and later operation and maintenance of roads in subsidence areas. Tests have shown that the higher level of road construction can easily cause the activation of the subsidence area,which will lead to the settlement and deformation of the roadbed. Therefore,the road construction in the subsidence area should be strictly controlled. The vertical settlement of the roadbed mainly occurs in the middle of the subsidence area,and the settlement remains obvious as a whole. The damage is mainly due to the separation of the subgrade. Horizontal movement mainly occurs at the edge of the subsidence area,and the damage is mainly concentrated shear failure,and the deformation and damage of the subgrade near the cut-off cut affected by mining is greater than the side of the stop line. The lateral deformation of the subgrade is concentrated and regionalized. The outer and middle embankments of the collapsed area are compressed and deformed,while the inner embankment of the marginal area is swollen and deformed.