Uneven settlement control structure and construction process for open trench tunnel

Abstract

The invention discloses a uneven settlement control structure and a construction process for an open trench tunnel and relates to the field of tunnel construction. The uneven settlement control structure mainly comprises a beam foundation used for supporting a tunnel structure; the beam foundation is formed by overall pouring of expanded longitudinal beams, cross beams and a cushion board; the expanded longitudinal beams are arranged at the two sides below a tunnel; the crossbeams are longitudinally and uniformly arranged on the expanded longitudinal beams; the cushion board is arranged on thecrossbeams; the tunnel is arranged on the tunnel so that the cushion board can cooperate with the longitudinally and uniformly arranged crossbeams to receive the stress in a synergetic manner, and the uneven settlement among pipe joints of the tunnel can be controlled and reduced.

Description

technical field [0001] The invention relates to an uneven settlement control structure and construction technology of an open-cut tunnel, and mainly relates to the field of tunnel construction. Background technique [0002] In mountainous cities such as Chongqing, there are a large number of backfill areas. Due to the differences in the degree of compaction and backfill depth in different areas of the backfill section, large uneven longitudinal settlements often occur in the open-cut tunnels in the backfill section. The impact on internal force, deformation, joint waterproofing, and normal operation of the tunnel cannot be ignored. [0003] At present, the industry mainly adopts foundation treatment measures such as cement-soil mixing piles, isolation piles, enclosure piles, and foundation piles to control the uneven settlement of the tunnel. It is also relatively large, especially in the soil-rock mixed filling area, which will lead to a prolonged construction period and a...

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Problems solved by technology

[0003] At present, the industry mainly adopts foundation treatment measures such as cement-soil mixing piles, isolation piles, enclosure piles, and foundation piles to control the uneven settlement of the tunnel. It is also relatively large, especially in the construction of earth-rock mixed filling area, which will lead to the extension of the construction period and greatly increase the cost

In addition, there is also a treatment method of setting a pre-compression layer between the tunnel floor and the soft soil layer below, and the workload and cost are relatively large

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