Method for judging anchoring depth of arch support built-in foundation of deck type arch bridge

Abstract

The invention discloses a method for judging the anchoring depth of an arch support built-in foundation of a deck type arch bridge. During model establishment, the influence of the inclination angle of the built-in foundation on the anchoring depth is fully considered; the influence of a soil layer and a rock layer on the built-in foundation is considered; compared with the prior art, calculationis carried out only according to a uniform rock stratum, only the influence of the bending moment on the anchoring depth is considered. According to the method, the effects of bending moment and shearing force are comprehensively considered; the method effectively reflects the stress condition of the skewback foundation, is suitable for complex geological conditions, solves the problem of judgingthe reasonable anchoring depth of the built-in foundation, is scientific, reliable and practical, ensures the safety and reliability of the skewback foundation, facilitates the improvement of the safety of a bridge structure, and provides a direction for the design of the built-in foundation of the large-span arch bridge.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a method for judging the anchorage depth of an embedded foundation of an abutment of an upwardly supported arch bridge. Background technique [0002] The embedded foundation is a foundation form similar to a single pile inserted deep into the rock formation, and simultaneously bears axial force, bending moment and shear force. According to the direction, it can be divided into vertical or oblique embedded foundation. The vertical embedded foundation can be used in bridge piers such as girder bridges, cable-stayed bridges and suspension bridges, and the oblique embedded foundation is used for the abutment foundation of the main bridge of the overhanging arch bridge. [0003] The anchorage depth refers to the depth of the foundation embedded in the rock, which is a key indicator of foundation design. If the anchorage depth is too shallow, the foundation function will fai...

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Problems solved by technology

[0004] The anchorage depth of the embedded foundation in the prior art is usually calculated with reference to the anchorage depth of the pile foundation in the code, only considering the influence of the bending moment on the anchorage depth, which is suitable for the vertical embedded foundation with little shear force Yes, but for the oblique embedded foundation, under the huge vertical reaction force and horizontal thrust of the main arch, the abutment foundation not only bears huge axial force and bending moment, but also bears relatively large shear force. Calculations with technology often lead to a seriously small embedding depth, resulting in the failure of the foundation of the abutment, which in turn threatens the structural safety of the entire bridge, and even causes the collapse of the arch bridge

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