Radial resistance controllable supporting structure suitable for large-deformation tunnel and supporting method

Abstract

The invention discloses a radial resistance controllable supporting structure suitable for a large-deformation tunnel and a supporting method, and belongs to the technical field of tunnel engineeringconstruction. The structure comprises a primary spraying concrete layer, an inflatable cushion and a steel plate, wherein the primary spraying concrete layer is arranged on the surface of a surrounding rock in a tunnel, the inflatable cushion is fixed on one side of the steel plate, one side of the steel plate, provided with the inflatable cushion, is arranged close to the primary spraying concrete layer, an arch springing of the steel plate is fixed to the surrounding rock, the inflatable cushion is inflated to a safe pressure value, and a secondary lining is arranged on one side of the steelplate, which is not contacted with the inflatable cushion; the inflation cushion is provided with an inflation valve and a constant pressure deflation valve. According to the invention, the supporting structure can adapt to an ultra-large-deformation tunnel and a non-uniformly-deformed large-deformation tunnel, the surrounding rock pressure is uniformly released, the safety of the tunnel is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a radial resistance controllable support structure and a support method suitable for large deformation tunnels. Background technique [0002] At present, for the release of surrounding rock displacement in large-deformation tunnels, resistance limiters (yield units) or buffer material layers are mostly used to release the deformation and pressure of surrounding rock. The resistance limiter (yield unit) releases the circumferential displacement. For super-large deformation tunnels, since the displacement release of a single resistance limiter (yield unit) is limited, more resistance limiters (yield units) are required for displacement release. This leads to uneconomical construction. The use of buffer material layer to release the displacement of surrounding rock cannot effectively control the radial support resistance, and its adaptability to non-uniform ...

AI Technical Summary

Problems solved by technology

The resistance limiter (yield unit) releases the circumferential displacement. For super-large deformation tunnels, since the displacement release of a single resistance limiter (yield unit) is limited, more resistance limiters (yield units) are required for displacement release. resulting in uneconomical construction

The use of a buffer material layer to release the displacement of the surrounding rock cannot effectively control the radial support resistance, and its adaptability to the working conditions of non-uniform deformation is not strong

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