Shallow-buried shield tunnel roof stability judgment method
A technology for shield tunneling and tunneling, which is applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, instruments, etc.
Active Publication Date: 2021-09-17
CHINA CONSTR FIFTH ENG DIV CORP LTD
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Problems solved by technology
Most of the existing patents or other achievements use the Hawke-Brown criterion to analyze the mechanism of tunnel instability, but it is difficult to determine the Hawke-Brown parameters in actual engineering, and this problem is still not well resolved
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[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific implementation methods in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0031] A method for judging the roof stability of a shallow buried shield tunnel provided by this application can be applied to such as figure 1 shown in the scene model diagram. Among them, 1-slump area; 2-rectangular tunnel; 3-circular tunnel; L u -Critical width of the half-excavation of the tunnel, that is, the limit value range of the half-excavation of the tunnel; L-the actual half-excavation width of the tunnel, which should be the default value in the following; h is the height of the collapsed area; xoy is the establishment coordinates as shown in the figure syst...
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Abstract
The invention provides a shallow-buried shield tunnel roof stability judgment method which comprises the following steps: determining parameters according to preset conditions, and setting a preset value of the half-excavation width of a tunnel; based on the parameters, establishing an expression of a molar strength envelope line, establishing a shear strength expression of a generalized Hawk-Brown criterion according to a limit analysis principle, further establishing an expression of the tunnel semi-excavation width for calculating the limit value range of the tunnel semi-excavation width, combining the expressions and the parameters, and determining limit value range of the half-excavation width of the tunne; and finally comparing the predicted value with the limit value range, and if the predicted value is within the limit value range, determining that the tunnel roof is stable. The potential collapse criterion formula of the shallow-buried shield tunnel is solved according to rigorous mathematical formula derivation, accurate reference is provided for tunnel collapse prevention, and the simple, convenient and practical shallow-buried tunnel top plate limit width determination method is provided so that related parameters are easy to determine.
Description
technical field [0001] The invention relates to the technical field of disaster prevention and control of geotechnical and urban underground engineering, in particular to a method for judging the roof stability of a shallow-buried shield tunnel. Background technique [0002] In the past few decades, there have been a large number of subway and tunnel constructions in my country, and the construction of subway projects will inevitably encounter shallow buried sites. However, this has also caused many accidents such as tunnel (chamber) collapse. Tunnel collapse mostly occurs in tunnels under construction. Therefore, it is necessary to conduct stability analysis before excavation to reduce the risk of safety accidents and prevent them. It is of great significance to ensure the sustainable development of our country's economy and society. [0003] As far as the stability analysis of the tunnel roof is concerned, the most critical issue is to determine its excavation width. Mos...
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IPC IPC(8): G01N3/08G01N9/00G06F30/13G06F30/20G06F119/14
CPCG01N3/08G01N9/00G06F30/13G06F30/20G06F2119/14G01N2203/0003G01N2203/0017G01N2203/0019
Inventor 曹勇衣利伟唐福源黄小城陈秋南石红兵李振宇
Owner CHINA CONSTR FIFTH ENG DIV CORP LTD