关键词: 地裂缝场地, 振动台试验, 地震动参数, 动力响应

Abstract: In order to study the dynamic response of ground fissure sites, based on a 13-layer shear model box, the shaking table test was used to simulate the dynamic response of the f4 ground fissure site in Xi’'an. The failure characteristics and dynamic response of the ground fissure site under different seismic waves were studied. The peak change laws of ground motion parameters were obtained. The test results showed that the main fissure gradually cracked and expanded on the surface, and the secondary fissures were developed at 45 degree joining the main fissure as the dynamic test continued. Moreover, the number of secondary fissures increased with the increase of input seismic intensity. The response of ground motion parameters at the ground fissure site had hanging-wall/ footwall effect. The ground motion peak of the hanging-wall reached the maximal value at the fissure on hanging-wall side and the peak gradually decreased from the main fissure to the two sides. Beyond that, the seismic intensity increasing weakened the site amplification effect. In addition, the changing frequency of acceleration at the hanging-wall site was faster than that at the footwall site. Meanwhile, there was a phase difference between the peak acceleration response on the hanging-wall and that on the footwall. However, the velocity and displacement time history curves of two sides were basically consistent. The research results are an important reference for seismic design of structure passing through the ground fissures.

Key words: ground fissure site, shaking table test, ground motion parameters, dynamic response