Anti-freezing structure for tunnel project in permafrost region

Abstract

The invention provides an anti-freezing structure for a tunnel project in a permafrost region. The structure comprises a plurality of anti-freezing tubes and a plurality of cold and heat exchange tubes. A plurality of anti-freezing tubes are transversely arranged in a tunnel lining structure in an arch shape and are located between a preliminary support and a waterproof layer, a plurality of anti-freezing tubes are longitudinally arranged along a tunnel, and a gap is arranged between two adjacent anti-freezing tubes. The plurality of cold and heat exchange tubes are radially distributed alonga cross section of the tunnel, one end of each of the cold and heat exchange tubes communicates with one side of each of the anti-freezing tubes close to the waterproof layer, and the other end passesthrough a surrounding rock melting circle to extend into a deep frozen soil area. Both the anti-freezing tubes and the cold and heat exchange tubes are closed structures and are loaded with mediums for cold heat exchange. According to the anti-freezing structure for the tunnel project in the permafrost region, the cold and heat exchange between the deep frozen soil area and the surrounding rock melting circle can be quickly achieved, therefore, the ice melting phenomenon of a surrounding rock is improved, and the surrounding rock can be kept frozen to solve the problem of diseases in the tunnel project of the permafrost region.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to an antifreeze structure for tunnel engineering in permafrost regions. Background technique [0002] A large number of engineering practices have shown that there are freeze-thaw problems during the construction of roads or railway tunnels in permafrost regions. The tunnel passes through the permafrost area, and the permafrost ice in the permafrost on the construction work surface is melted due to construction disturbance. For the melting of ice in rock permafrost, after the secondary lining of the tunnel is completed, there will be a permafrost melting circle between the initial lining and the deep permafrost, and between the deep part of the surrounding rock and the freeze-thaw zone in the permafrost area. Cold and heat transfer is slow, and after the tunnel is completed, this part of the permafrost thawing circle will produce frost heave and damage the tunnel. [0...

AI Technical Summary

Problems solved by technology

Although these measures have played a partial role in solving tunnel engineering defects in permafrost regions, they cannot fully guarantee the progress of the project, the high cost and the freezing of the entire tunnel.

Moreover, these measures are often only adopted in relatively special sections, and are not suitable for general adoption.

Images