Combined highway tunnel portal structure suitable for large-bias terrains

Abstract

The invention discloses a combined highway tunnel portal structure suitable for large-bias terrains. The structure comprises two rows of pile foundation groups arranged at intervals, each row of pilefoundation groups includes a plurality of pile foundations, the upper surfaces of the pile foundations are located on the same horizontal plane, a bearing table is arranged on the upper surfaces of the pile foundations, and the bearing table is flush with the bottom of a tunnel; the pile foundations are distributed from lower portions of adjacent side edges of an excavated part of the tunnel to the excavation direction of the tunnel, and the pile foundations are parallel to the tunnel; ear walls are arranged on the bearing table, the wall faces, close to the tunnel, of the ear walls are attached to a tunnel primary support, the tops of the ear walls are higher than the arch top of the tunnel, a space is formed by the ear walls and a mountain body at the high position of a slope, and the space is filled and reinforced with cement stabilized gravel and combined with a mountain body at the lower side of the lower slope to form the excavated part of a tunnel portal. By means of the combined highway tunnel portal structure suitable for the large-bias terrains, the portal structure solving a high slope problem and a tunnel basic suspension problem is lowered, the portal structure avoidsthe high slope problem, and the portal can be freely moved according to the terrains and a roadbed slope.

Description

technical field [0001] The invention belongs to the technical field of road tunnel door design, and in particular relates to a combined road tunnel door structure suitable for large bias terrain. Background technique [0002] Complex topography, fragile ecological environment, and sensitivity to human development activities in mountainous areas lead to more and more serious damage to the environment caused by highway construction in mountainous areas. One of the more prominent problems is the problem of high side slopes at tunnel entrances. The line position of expressway tunnels in mountainous areas, especially short tunnels, is limited by the control of the overall route, and the openings are often located in large bias terrain and weak and broken sections. [0003] Excavation on the side slope of the high slope tunnel is easy to damage the slope toe and break the existing balance of the slope, thereby inducing the slope to slide, destroying the structure of the tunnel doo...

AI Technical Summary

Problems solved by technology

[0003] Excavation on the side slope of the high slope tunnel is easy to damage the slope toe and break the existing balance of the slope, thereby inducing the slope to slide, destroying the structure of the tunnel door and the tunnel body, and endangering the safety of the tunnel

Once a landslide accident occurs, it will seriously affect the tunnel structure, and even directly destroy the tunnel, causing casualties and property losses

[0004] At present, for the treatment of high-side slope tunnels, slope brushing is generally adopted. If the slope is too high, the excavation slope can be reduced by designing tunnel protection arches and using shed holes. If the effect of slope reduction is still not obvious, move the door position Avoid brushing the slope, but moving the portal may create new problems, such as the tunnel foundation hanging in the air

For foundation suspension treatment, replacement and foundation expansion can be adopted, but for the portal structure at the toe of the slope, such treatment will disturb the toe of the slope, easily cause landslides, and threaten construction safety

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