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A three-dimensional protection design method for rockfall hazards at tunnel entrances

A protective design and tunnel technology, which is applied in the treatment of dangerous rockfall at the entrance of highway tunnels and in the field of railways, can solve the problems of destroying the ecological environment of the entrance, complex construction, high cost, etc., achieve a scientific and reasonable system, improve engineering applicability, and reduce engineering cost Effect

Active Publication Date: 2020-04-03
SOUTHWEST JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The construction is complicated, the cost is high, and it will damage the ecological environment of the cave entrance

Method used

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  • A three-dimensional protection design method for rockfall hazards at tunnel entrances
  • A three-dimensional protection design method for rockfall hazards at tunnel entrances
  • A three-dimensional protection design method for rockfall hazards at tunnel entrances

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specific Embodiment 1

[0072] The protection energy level of the three-dimensional protection design method for rockfall disaster at the tunnel entrance of the present invention is 5000kJ, and the specific process is as follows:

[0073] 1. Clarify the energy dissipation ratio

[0074] According to the rockfall disaster protection energy level of the tunnel entrance 1 is 5000kJ, combined with the principle of energy matching to determine the energy consumption ratio of each structure, the curtain protection net above the tunnel entrance 3γ 1 Take 0.65, bisect guide net 4γ 2 Take 0.2, for the curtain protective net on both sides of the tunnel entrance 6γ 3 Take 0.05, flexible shed hole 5γ 4 Take 0.10.

[0075] Table 1 Values ​​of energy consumption proportional coefficients for each structure

[0076]

[0077]

[0078] 2. Structural selection and layout

[0079] Carry out three-dimensional scanning of the mountain to determine the position of the dangerous rock and the preliminary movement...

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Abstract

The invention provides a three-dimensional protection design method used for a tunnel portal rockfall hazard. The method comprises the steps that 1, structure energy dissipation ratio principles of acurtain-type protection screen over a tunnel portal, an independently-targeted screen and curtain-type protection screens on the two sides of the tunnel portal are made clear; 2, the width, the span and a longitudinal initial position of the curtain-type protection screen over the tunnel portal are determined; 3, the width, the length, a relationship with the portal, cross slope and longitudinal slope positions and an angle of the independently-targeted screen are determined; 4, the width and the spans of the curtain-type protection screens on the two sides of the tunnel portal are determined;5, initial types of parts of the curtain-type protection screen over the tunnel portal, the independently-targeted screen and the curtain-type protection screens on the two sides of the tunnel portalare determined; 6, the width and the height of a flexible hangar tunnel of the tunnel portal are determined. According to the technology, an energy matching design principle is adopted for making designs of the structures more scientific and reasonable, and the detailed design of each structure is taken into account, so that three-dimensional protection of tunnel portal rockfall is achieved.

Description

technical field [0001] The invention relates to the entrance and exit of railway and highway tunnels, and is suitable for the treatment of dangerous rockfall at the entrance of the tunnel, which affects the structure and operation safety of the tunnel entrance. Background technique [0002] my country's railways and highways are limited by terrain, and often travel through mountains and mountains. It is inevitable to cross valleys or rivers in the form of bridge engineering, and may also cross mountains and mountains in the form of tunnel engineering, especially in areas with steep tunnel entrances and deep canyons. , and often appear in the form of a bridge-tunnel connection. [0003] Due to the limitation of the terrain and the construction site in the bridge-tunnel connection section, the slope at the entrance and exit of the tunnel is high and steep, and the geological conditions are harsh. It will cause great harm to tunnel openings and adjacent bridge projects, and ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/14G06F30/23
CPCE21D9/14G06F30/23
Inventor 余志祥齐欣许浒赵雷
Owner SOUTHWEST JIAOTONG UNIV
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