Shaking table tests on acceleration response of ground fissure site

The ground fissure has brought severe damages to the engineering structures. In the area of high seismic intensity, if the spatial avoidance principle is still adopted, it will be bound to waste the land resources and restrict the urban construction. In order to study the dynamic response of ground fissure sites, taking the ground fissure of f₄ in Xi'an city as an example, the model test for the ground fissure site is carried out by means of the shaking table based on the laminar shear box. The test results show that the acceleration amplification factor is related to the type and intensity of input seismic waves, the properties and thickness of soil layers and the location of measuring points. Furthermore, the ground fissure site has hanging-wall/footwall effect. All the peak ground accelerations of the hanging-wall and footwall reach the maximum at the site of the fissure, they decrease from the fissure to the sides, and the rate of the hanging-wall peak acceleration attenuation is slower than that of the footwall. At the same time, the peak ground acceleration of the fissure at both sides has the time difference, and the acceleration change frequency of hanging-wall is faster than that of the footwall. The results may provide references for the engineering application of ground fissure sites.