Bridge composite foundation suitable for deep water and strong earthquake conditions

Abstract

The invention discloses a bridge composite foundation for deep water and strong earthquake conditions, and particularly relates to combination application of a group pile foundation body, suction caisson foundation bodies, a pressure-less caisson foundation body and a reinforced cushion. According to the bridge composite foundation, the multiple suction caisson foundation bodies are arranged on the periphery of the pressure-less caisson foundation body in an annular shape, the pressure-less caisson foundation body is directly arranged at the top of the reinforced cushion and is not connected to piles and the suction caisson foundation bodies, the position between the suction caisson foundation bodies and the pressure-less caisson foundation body is filled with ring-and-stringer-stiffened rubble, and the reinforced cushion plays a main role in seismic isolation, is formed by combining a sand cushion body, a pebble bed and a rubble layer and is further provided with geotextile and a geogrid so as to control particle dislocation and cushion liquefaction. The novel bridge composite foundation can be applied to the deep water and strong earthquake severe natural conditions, the seismicisolation effect can be achieved, the transmission of the earthquake force from the ground to the foundation can be reduced, meanwhile, a relatively large horizontal load can be borne, the horizontaldisplacement of the foundation can be limited, and the safe use of a bridge can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of bridges, and relates to a bridge composite foundation suitable for deep water and strong earthquake conditions, specifically the combined use of pile group foundations, suction caisson foundations, non-pressure caisson foundations and reinforced cushions. Background technique [0002] At present, the common deep water foundations of bridges include pipe column foundation, pile foundation, caisson foundation, caisson foundation and so on. Due to the deep water depth and the uneven softness and hardness of the covering layer, the super long-span bridges across bays and straits often cannot meet the needs of the environment with a single foundation form, so caissons plus piles or caissons plus pipe strings are often used. However, because of its unique geographical environment, cross-sea bridges often have to face extreme loads such as earthquakes and strong winds. Especially in view of the severe reality t...

AI Technical Summary

Problems solved by technology

Under common wind, wave, current and other loads, the foundation can basically remain stable, but under strong wind and long-term scouring conditions, the foundation may have a large displacement

At the same time, under deep water and earthquake conditions, the gravel cushion is likely to undergo vibration liquefaction, which may also lead to the destruction of the entire foundation, thus threatening the overall safety of the bridge

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