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Risk-based tunnel supporting structure design method

A support structure and design method technology, applied in tunnels, tunnel linings, mining equipment, etc., can solve problems such as tunnel engineering construction risks, achieve accurate calculation of surrounding rock displacement and support stress, reasonable support design, and reduce losses Effect

Inactive Publication Date: 2010-01-27
TONGJI UNIV
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Problems solved by technology

The existence of these uncertain factors brings great risks to tunnel construction.

Method used

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  • Risk-based tunnel supporting structure design method
  • Risk-based tunnel supporting structure design method
  • Risk-based tunnel supporting structure design method

Examples

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Embodiment 1

[0021] Example 1: A tunnel with a total length of about 6.2 kilometers is constructed using the mining method. The tunnel structure adopts a composite section form of multiple centers, with a width of 15.7 meters and a height of 12.0 meters. Carry out tunnel support structure design according to the above steps.

[0022] (1) According to the geological data, the surrounding rocks at the tunnel site are grade II-V, and the tunnel passes through 14 fracture zones in 4 groups. According to the similarity of geological conditions, the tunnel can be divided into 13 geological units along the axis of the tunnel. The width of the fracture zone traversed by the tunnel is predicted using pessimistic and optimistic prediction methods.

[0023] (2) Based on the grade of surrounding rock given in the geological survey report, use the engineering analogy method to make a possible initial support design scheme for each geological unit. For example, the following support design scheme can b...

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Abstract

The invention relates to a risk-based tunnel supporting structure design method, comprising three links: determining the initial design scheme of a tunnel supporting structure, evaluating the risk of each supporting scheme, and making decision and analyzing the supporting schemes. In the method, a probability method and a risk analysis model are applied to carry out quantitative description to physical mechanics indexes of a surrounding rock and the uncertainty in geological exploration; the initial design scheme for supporting is given according to the level of the surrounding rock; space effect of tunnel excavation is considered and a convergence-confinement method is improved through the hardening process for pneumatically placed concrete supporting, the calculation procedures of the improved convergence-confinement method are used for analyzing the determined supporting design scheme, and the failure probability of the supporting and the surrounding rock is given under different construction parameters; and then the risk evaluation is carried out to the supporting design scheme, accident risk acceptance criteria is determined, and proper supporting design scheme is determined by a decision maker. In the method, the risk ideal is led in engineering practice for processing various uncertain problems in the tunnel structure design, so as to be beneficial to carrying out quantitative analysis and evaluation to the effect of the uncertain factors in the tunnel supporting structure design and ensure the safety and the investment control of the tunnel forcefully and comprehensively.

Description

technical field [0001] The invention relates to a method for designing a highway tunnel support structure, in particular to a risk-based design method for a tunnel support structure. Background technique [0002] my country has a vast territory and many mountains. In recent years, with the rapid development of highway construction, the number and construction scale of rock tunnels have greatly increased. All kinds of problems that emerged along with it have also attracted people's attention day by day. Unlike ground structures, tunnel engineering contains a large number of uncertain factors. On the one hand, these uncertain factors are the uncertainty of the physical properties of the material of the structure itself; on the other hand, the uncertainty of the natural environment and human-imposed effects faced by tunnel engineering. The existence of these uncertain factors brings great risks to tunnel engineering construction. [0003] The tunnel design needs to make a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00
Inventor 黄宏伟王燕薛亚东吴坚
Owner TONGJI UNIV
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