Abstract
With the development of the Chinese railway, the high-steep slope is irreversible to be faced; especially under severe conditions such as heavy rainfall and earthquake, this kind of slope is prone to geological disasters, which seriously affects the safety and stability of the bridge substructure. Aiming to this, long-term monitorization and numerical analysis were carried out in this research, and the influence mechanism of the high-steep slopes on the stress and deformation characteristics of the bridge structure was studied. The research results show that under the effect of rainfall and earthquake, the original stress balance in the high-steep slope is broken, and the possibility of landslide thrust increases; under the comprehensive impact of residual landslide thrust, traction force at slope foot, vertical gravity of bridge slab and vehicle, and the bridge cap will deform. Besides, the deformation of the bridge pier exceeds the allowable lateral displacement of the top of the bridge pier, reaching 111.7%∼112.4% of the limit, which seriously affects the stability of the bridge structure and the safety of the railway service. Therefore, by increasing the support strength of the slope foot and the diameter of the bridge pile foundation, the traction force of the slope foot can be reduced, and the sliding resistance of the bridge pile foundation can be improved so as the safety of the bridge structure can be promoted.
Highlights
Considering the railway alignment and the natural environment, many railways have to be built along high-steep slopes during the development of the Chinese railway; at this time, the horizontal force of the rock and soil will be subjected to the substructure of the bridge
(2) During the in-site monitorization, under the influence of rainfall and earthquake, the antislide pile and bridge structure deforms, but the force and deformation characteristics are not obvious, and the slope and bridge structure remains stable as a whole
(3) Under extreme conditions such as rainfall and earthquakes, the deformation of the bridge pier and abutment exceeds the allowable limit of the lateral displacement of the pier top, reaching 111.7%∼ 112.4% of the limit, which seriously affects the stability of the bridge structure and the safety of railway operations. e horizontal bearing capacity of the bridge structure is limited, and the deformation of the pier foundation is strictly required
Summary
Considering the railway alignment and the natural environment, many railways have to be built along high-steep slopes during the development of the Chinese railway; at this time, the horizontal force of the rock and soil will be subjected to the substructure of the bridge. Because the substructure of the bridge is designed to mainly ensure vertical supportability, the horizontal bearing capacity is limited, and the deformation of the pier foundation needs to be strictly controlled. The substructure of bridges on a high-steep slope is more complicated and has many differences in bearing mechanism and stress conditions. After being subjected to the horizontal loading, the deformation characteristics and the relationship between internal stress and deformation of the bridge substructure were studied [13–19]. In this paper, based on a railway, the influence mechanism of the high-steep slopes on the stress and deformation characteristics of the bridge substructure was studied. Anchor frame beam Figure 1: Bridge abutment Spindle section e engineering geological plan of landslide
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