An evaluation method for the bearing capacity of tunnel anchorages of suspension bridges

Abstract

The invention discloses an assessment method for carrying capacity of a suspension bridge tunnel type anchor. The assessment method comprises the following steps: (1) obtaining physical and mechanic parameters of surrounding rocks; (2) initially drafting tunnel anchor design parameters; (3) converting the tunnel anchor into an equivalent mechanical model according to the equal-volume equal-altitude principle, and calculating self-weight and side surface frictional resistance of the equivalent mechanical model; (4) determining key-stone effect coefficients Omega 1 and Omega 2; (5) calculating anti-pulling carrying capacity P1 and P2 of the equivalent model; (6) calculating design load PSL and ultimate uplift load PJL of the tunnel anchor with length being (L+L0); and (7) returning to the steps (3) to (6) to obtain design load PSL0 and ultimate uplift load PJL0 of the tunnel with length being L0 (burial depth), thereby obtaining the design load PS and the ultimate uplift load PJ of the actual tunnel anchor. The method reveals the mechanical mechanism of greatly increasing the carrying capacity of the tunnel anchor, and is simple and convenient, quick and accurate to operate, so that the simple and practical requirements of engineering design and application to a calculating method are met, and the popularization and the application of the tunnel anchor in engineering practice are further promoted.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and more specifically relates to an evaluation method for the bearing capacity of a tunnel anchor of a suspension bridge, which is applicable to the calculation of the two failure modes of the tunnel anchor by using the wedge effect coefficient under different types of surrounding rock conditions of the suspension bridge To evaluate the bearing safety of tunnel anchors under certain geological conditions. Background technique [0002] With the development of my country's economy, the application of suspension bridges in engineering construction is increasing, and the scope of influence on the ecological environment is also becoming wider and wider. Developing the economy under the premise of protecting the natural environment has become an important measure to improve our country's ecological environment. In terms of engineering application, the tunnel anchor has two advantages:...

AI Technical Summary

Problems solved by technology

It can be seen that the design of tunnel anchors has not yet formed a system, and the scientific research results have not been popularized and applied.

Images