A long-span expressway tunnel with weak surrounding rock

Abstract

The invention discloses a large-span weak-surrounding-rock expressway tunnel, comprising a weak rock tier, a tunnel base, a stone filling tier, a concrete basal tier and an aseismic filling tier. Thetunnel base is arranged in the weak rock tier; the aseismic filling tier is arranged in the tunnel base above the stone filling tier; drain ditches are arranged in the top of the tunnel base on two sides of a subgrade; the subgrade is arranged at the top center of the tunnel base; the surface of the subgrade is provided with nonslip grooves at equal intervals; bearings are arranged on the inner wall of the tunnel base on both sides of the subgrade; an open-cut tunnel lining is arranged above the bearings; a load-bearing vault is arranged on one side of the inside of the open-cut tunnel lining;the side, close to the subgrade, of the load-bearing vault is fitted with concrete segments at equal intervals. The invention also discloses a construction method of the large-span weak-surrounding-rock expressway tunnel. The application safety of the expressway tunnel is improved, application stability of the expressway tunnel is improved, and the service life of the expressway tunnel is extended.

Description

technical field [0001] The invention relates to the technical field of highway construction, in particular to a large-span expressway tunnel with weak surrounding rock. Background technique [0002] With the rapid development of my country's infrastructure construction work, more and more expressways have entered the mountainous and hilly areas, and the number of bridges and tunnels is increasing day by day. It is a true portrayal of today's mountainous expressway construction. Generally, due to the narrow terrain of some sections, the tight construction site, and the high line position in mountainous areas, the construction and layout of highway bridges and tunnels are very difficult, especially for large-span expressway tunnels with weak surrounding rocks. , due to the low strength of the weak surrounding rock structure, it is easy to cause structural collapse during the construction process, which not only increases the construction cost, but also poses certain safety hazar...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of my country's infrastructure construction work, more and more expressways have entered the mountainous and hilly areas, and the number of bridges and tunnels is increasing day by day. It is a true portrayal of today's mountainous expressway construction. Generally, due to the narrow terrain of some sections, the tight construction site, and the high line position in mountainous areas, the construction and layout of highway bridges and tunnels are very difficult, especially for large-span expressway tunnels with weak surrounding rocks. , due to the low strength of the weak surrounding rock structure, it is easy to cause structural collapse during the construction process, which not only increases the construction cost, but also poses certain safety hazards to the construction site and later operation. In addition, if the surrounding environment of the tunnel undergoes geological changes, It will also affect the stability around the tunnel, and the geological composition of weak surrounding rock areas is generally loose and wet, which may cause the interior of the tunnel to be too humid, or even accumulate water, which will have a negative impact on the long-term normal operation of the tunnel

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