Failure mechanism of subgrade when surface water infiltrating through fault and fissure

When surface water infiltrate fissure, it will bring foundation such complicated physical chemistry effect as prominent erosion, collapse, soften, which makes the surface generate differential settlement, and then triggers deformation and cracking of pavement structure. Based on In-situ permeability test and finite element software MIDAS/GTS, influence has been studied when surface water infiltrating roadbed on the condition of ground fissure, the results show that the basement will sink together with road surface on the gravity of highway, and its deformation is identical with the ground settlement curve. The stress state of the road is under control of uneven surface subsidence curve, all that provided important basis for the faults of the highway engineering fracture risk assessment and prevention scheme.