Calculating method for extra large span chamber second liner supporting structure

Abstract

The invention discloses a calculating method for an extra large span chamber second liner supporting structure. The calculating method comprises the following steps that firstly, an upper limit valueof the deformation of a chamber is obtained by carrying out fitting analysis on monitoring measurement data; secondly, the residual deformation of the chamber is worked out; thirdly, the downward sliding force and the sliding resistant force of an unstable block on the upper portion of the chamber are worked out; fourthly, the pressure, acting on the second liner supporting structure, of the unstable block is worked out; fifthly, the residual deformation and the action pressure of the unstable block are taken as input conditions and act on the second liner supporting structure simultaneously,and the stress state of the second liner supporting structure is worked out through calculation software. According to the calculating method, the residual deformation and the action pressure of the unstable block are taken as the input conditions to carry out calculation of the second liner supporting structure, and the method conforms to the deformation feature and the stabilizing mechanism of the extra large span chamber; and the obtained thickness of the second liner supporting structure is reasonable, and the issues such as increasing of the manufacturing cost, pouring difficulty and prolonging of the working period due to large lining thickness of the extra large span chamber are avoided.

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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