Probabilistic reliability design method for arched open cavity structure without backfill under rockfall impact

Abstract

The invention discloses a probabilistic reliability design method for an arched open hole structure without backfill soil under the impact of falling rocks, which comprises the construction of the ultimate bearing capacity model of the arched open hole structure, the impact load model of the falling rocks on the arched open hole, and the impact load model of the arched open hole under the impact of falling rocks. The limit state equation of the arched open hole structure without backfill; according to the limit state equation, the structural reliability index of the arched open hole is calculated by using the JC method in the first-order second-order moment method; when the structural reliability index is equal to the target reliability index and the structural reliability index When it is greater than the target reliability index and the value beyond the target reliability index is less than or equal to the set threshold, the probabilistic reliability of the arched open hole structure designed by the selected structural design parameters meets the design requirements; when the structural reliability index is less than the target reliability index and the structural reliability When the index is greater than the target reliability index and the value beyond the target reliability index is greater than the set threshold, the structural design parameters are adjusted until the probabilistic reliability of the arched open hole structure designed by the selected structural design parameters meets the design requirements.

Description

technical field [0001] The invention relates to the technical field of structural design of arched open tunnels, in particular to a probabilistic reliability design method for arched open tunnel structures without backfill soil under the impact of falling rocks. Background technique [0002] The non-backfill arched open tunnel is mainly used for the protruding portal of the tunnel entrance of the high-speed railway, as a buffer structure to solve the aerodynamic effect caused by the operation of the high-speed train. It has a certain function of preventing dangerous rockfall, and the material is generally reinforced concrete. In order to ensure driving safety, as a light transition section, arched open holes without backfill are also used in the entrance section of highway tunnels, generally in the shape of cut bamboo or bell mouth, and sometimes they are also designed for landscape design and to meet environmental requirements. [0003] For arched open caves located on hig...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the probabilistic reliability design method of the arched open cavity structure without backfilling soil under the impact of falling rocks provided by the present invention solves the failure of the arched open cavity structure without backfilling soil under the impact of falling rocks in the prior art The problem of calculating probability

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