A rapid underground excavation construction method for long-span shallow-buried tunnels

Abstract

The present invention proposes a fast underground excavation construction method for large-span shallow-buried tunnels, in which, the large section of the large-span tunnel is decomposed into multiple small-section forms by using the middle partition wall and cross braces, and the tunnel is segmented and batched and intermediate prefabricated Excavation by leaving the core soil column reduces the difficulty of full-section excavation of long-span tunnels. Excavation is carried out from the pilot pits on both sides of the upper vault first, which can effectively use the soil arch support effect at the top of the tunnel, and can also be used as a construction channel for subsequent excavation; synchronous and symmetrical excavation on both sides can maintain the force balance during excavation and avoid Uneven stress; the reserved core soil column can be used as the supporting point for the whole construction process to prevent the overall instability and damage of the tunnel; the temporary support of the middle partition and cross brace can ensure the collapse of the top and the expansion and extrusion damage of the side wall and bottom , the supporting structure and construction method proposed by the present invention are safe and practical, with reasonable steps, simple construction, low operation difficulty and efficient process.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a fast underground excavation construction method for a large-span shallow-buried tunnel. Background technique [0002] With the continuous development of social and economic construction, underground space projects are increasing day by day. The tunnel excavation method only excavates underground chambers without damaging the ground. It is widely used because of its small impact on the environment and does not affect traffic and ground buildings. Among them, the shallow burial and underground excavation method is a construction method for underground caverns that are shallower than the surface. At present, the construction technology of shallow buried and underground excavation method in tunnel and underground engineering is basically mature, but for projects with shallow buried depth, poor geological conditions and complex environment, there are many unfa...

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Problems solved by technology

[0003] In view of the deficiencies of the existing technology, based on the traditional tunnel excavation construction method for large-span tunnel construction difficulties, many safety hazards, and slow construction progress, a rapid underground excavation construction method for large-span shallow buried tunnels is proposed. Underground engineering with poor conditions and unstable rock masses

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