Abstract
In order to further understand the instability mechanism and geohazard causation when the main sliding path of the slope body is parallel to the path of the bridge, the corresponding bridge-landslide parallel system is constructed for shaking table tests. This paper summarizes the combination forms of bridge-landslide model under different position and focused on the slope body located above the bridge deck. Firstly, based on the shaking table test results of El Centro (1940), the failure behavior of bridge-landslide parallel system was evaluated, and the changes of acceleration and deformation of bridge pile were subsequently analyzed. Then, the interaction bridge structure and sliding body were explained by the spectral features. The main conclusions are as follows. First, in the model test, the landslide belongs to the thrust-type landslide. Due to the barrier function of the bridge, the main failure site of landslide occurs in the middle and trailing edge of slope body. At the same time, the acceleration value of earthquake waves is 0.3 g, which is the key to this variation. Second, the acceleration response of the measuring points on the bridge pile and landslide increases with the increase of ground elevation. If the slope structure is damaged severely, the deformation response of weak interlayer is inconsistent with the surrounding soil structure. Third, with the increase of excitation power, the dominant frequency of bridge-landslide parallel system gradually transitions from low to high frequency rate, and the interaction of the parallel system weakens the influence of river direction on frequency. Finally, under the same working condition, the dynamic response of the measuring points has obvious regularity with the change of situation. But the response of the same points is not regular due to the different earthquake excitation intensity.
Highlights
China is a country with many geological calamities, and earthquake, landslide, debris flow, and other geohazards are very prominent in the western mountainous areas of China [1]
Shirgir et al [11] studied the influence of pile-soil structure interaction (PSSI) on the earthquake response and dynamic characteristics of large-scale full model of super long-span cable-stayed bridge through earthquake wave, and the test results show that the interaction effect of pile-soil interface is gradually obvious with the increase of wave amplitude. e PSSI effect changes significantly with the change of wave frequency content
There have been a lot of studies on the PSSI effect, most of the existing studies mainly consider the interaction between the foundation and bridge, and there are few studies on the interaction including the geohazard region and bridge. erefore, the main focus of the present study is to explore the interaction of the bridge-landslide combination model
Summary
China is a country with many geological calamities, and earthquake, landslide, debris flow, and other geohazards are very prominent in the western mountainous areas of China [1]. Zhang et al [12] used the Yousuotun Bridge as a prototype to conduct multiple sets of large-scale shaking table model tests to study the force and deformation characteristics of bridge pier foundation piles under different waves, as well as the seismic performance and spectrum response laws of high and steep slopes. On this basis, the shaking table model test is carried out to analyze the dynamic response characteristics of landslide and bridge under seismic wave loading under different working conditions. The shaking table model test is carried out to analyze the dynamic response characteristics of landslide and bridge under seismic wave loading under different working conditions. It provides experimental data support for the stability analysis theory and seismic design of bridge-landslide parallel system
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