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Three-dimensional protection design method used for tunnel portal rockfall hazard

A protection design and tunnel technology, applied in the direction of tunnel, design optimization/simulation, calculation, etc., can solve the problems of destroying the ecological environment of the entrance, complex construction, high cost, etc., to achieve scientific and reasonable system, improve engineering applicability, and reduce engineering cost Effect

Active Publication Date: 2019-04-26
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • 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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  • Three-dimensional protection design method used for tunnel portal rockfall hazard
  • Three-dimensional protection design method used for tunnel portal rockfall hazard
  • Three-dimensional protection design method used for tunnel portal rockfall hazard

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specific Embodiment 1

[0071] The protection energy level using the three-dimensional protection design method of the tunnel entrance rockfall disaster of the present invention is 5000kJ, and the specific process is as follows:

[0072] 1. Clarify the energy dissipation ratio

[0073] According to the protection energy level of the rockfall disaster at the entrance of the tunnel 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 and divide the guide net 4γ 2 Take 0.2, curtain protective nets on both sides of the tunnel opening 6γ 3 Take 0.05, flexible shed hole 5γ 4 Take 0.10.

[0074] Table 1 Values ​​of energy consumption ratio coefficients of each structure

[0075]

[0076]

[0077] 2. Structure selection and layout

[0078] Carry out three-dimensional scanning of the mountain to determine the location of the dangerous rock and the preliminary movement track. Determine...

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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 rock and rock falling at the entrance of the tunnel, which affects the structure of the tunnel entrance and the safety of operation. Background technique [0002] my country’s railways and highways are restricted by topography and often travel through lofty mountains. It is inevitable that they will cross valleys or rivers in the form of bridge engineering, and they may also cross high mountains and ridges in the form of tunnel engineering, especially in the steep terrain of the tunnel entrance and deep canyons. , And often appear in the form of bridge and tunnel connected. [0003] Due to the restriction of the topography and construction site in the connecting section of the bridge and tunnel, the slopes at the entrance and exit of the tunnel are high and steep, and the geological conditions are bad. Under the action of natural disast...

Claims

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Application Information

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IPC IPC(8): E21D9/14G06F17/50
CPCE21D9/14G06F30/23
Inventor 余志祥齐欣许浒赵雷
Owner SOUTHWEST JIAOTONG UNIV
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