A Calculation Method for the Secondary Lining Support Structure of a Super-Large Span Cavern

Abstract

The invention discloses a calculation method for the second lining support structure of a super-large-span cavern, which comprises the following steps: a. obtaining the upper limit value of the deformation of the cavern by performing fitting analysis on the monitoring measurement data; b. calculating The remaining deformation of the cavern; c. Calculate the sliding force and anti-sliding force of the unstable block above the cavern; d. Calculate the pressure of the unstable block acting on the second lining support structure; e. The remaining deformation and the acting pressure of the unstable block are used as input conditions, and act on the second lining support structure at the same time, and the stress state of the second lining support structure is obtained through the calculation software. In the present invention, the remaining deformation and the acting pressure of the unstable block are used as input conditions to calculate the secondary lining support structure, which conforms to the deformation characteristics and stability mechanism of the super-large-span cavern; the thickness of the secondary lining support structure obtained by the present invention is reasonable, It avoids problems such as increased cost, difficulty in pouring, and extended construction period caused by the excessively large lining thickness of the super-large-span cavern.

Description

technical field [0001] The invention belongs to the technical field of tunnel and underground engineering design and construction, and in particular relates to a calculation method for a super-large-span cavern secondary lining support structure. Background technique [0002] As the last support system of the cavern, the secondary lining support structure is of great significance to its long-term stability. At present, the calculation of the secondary lining support structure mainly takes the load as the input condition, and the load is mainly determined according to the code and empirical formula, but the current code and empirical formula do not specify the load value for the cavern with a span greater than 30m. [0003] If the conventional load value method is used for analog calculation, the obtained load value will be large, which will lead to the design thickness of the second lining is too large, resulting in problems such as difficulty in pouring, increased cost, and...

AI Technical Summary

Problems solved by technology

[0003] If the conventional load value method is used for analog calculation, the obtained load value will be large, which will lead to the design thickness of the second lining is too large, resulting in problems such as difficulty in pouring, increased cost, and inconvenient operation. Therefore, the method of analog calculation is unreasonable of

For the calculation of the secondary lining support structure of underground caverns with a span greater than 30m, there is no reasonable and applicable calculation method at present

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