Non-backfill arch open-cut tunnel structure probability reliability degree design method under fallen rock impact

A design method and technology of structural design, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem of failure probability calculation of arched open-hole structures that cannot be backfilled

Active Publication Date: 2017-10-10
SOUTHWEST JIAOTONG UNIV
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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 r...

Method used

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  • Non-backfill arch open-cut tunnel structure probability reliability degree design method under fallen rock impact
  • Non-backfill arch open-cut tunnel structure probability reliability degree design method under fallen rock impact
  • Non-backfill arch open-cut tunnel structure probability reliability degree design method under fallen rock impact

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Embodiment Construction

[0018] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0019] refer to figure 1 , figure 1 Shown is a flow chart of the probabilistic reliability design method for arched open cavity structures without backfill under rockfall impact; the method includes steps 101 to 106.

[0020] In step 101, according to the structural design parameters of the arched open hole, a structural ultimate bearing capacity model of the arched open hole is constructed:

[0021]

[0022] Among the...

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Abstract

The invention discloses a non-backfill arch open-cut tunnel structure probability reliability degree design method under fallen rock impact. The method comprises the steps that a limit state function of an arch open-cut tunnel structure ultimate bearing capacity model, an impact load model of an arch open-cut tunnel by fallen rocks and a non-backfill arch open-cut tunnel structure under the fallen rock impact is built; according to the limit state function, a JC method of a first-order quadric moment method is adopted to calculate a structure reliability index of the arch open-cut tunnel; when the structure reliability index is equal to a target reliability index, and the structure reliability index is larger than the target reliability index and the value which exceeds the target reliability index is smaller than or equal to a set threshold valve, the arch open-cut tunnel structure probability reliability degree which is designed by a selected structure design parameter meets design requirements; when the structure reliability index is smaller than the target reliability index, and the structure reliability index is larger than the target reliability index and the value which exceeds the target reliability index is larger than a set threshold value, the structure design parameter is adjusted until the arch open-cut tunnel structure probability reliability degree which is designed by the selected structure design parameter 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...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 王玉锁吴正群唐建辉郭春冯高飞李正辉王涛何俊男周良徐铭吴浩王志龙王岩
Owner SOUTHWEST JIAOTONG UNIV
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