Shallow-buried bias tunnel asymmetric supporting structure and construction method

Abstract

The invention discloses a shallow-buried bias tunnel asymmetric supporting structure and a construction method. According to the shallow-buried bias tunnel asymmetric supporting structure, deep-buriedside initial shotcrete, a deep-buried side steel arch frame, deep-buried side composite shotcrete, a deep-buried side upper step feet-lock bolt, a deep-buried side lower step feet-lock bolt and a deep-buried side system bolt constitute a deep-buried side initial supporting structure body, and shallow-buried side initial shotcrete, a shallow-buried side steel arch frame, shallow-buried side composite shotcrete, a shallow-buried side upper step feet-lock bolt, a shallow-buried side lower step feet-lock bolt and a shallow-buried side system bolt constitute a shallow-buried side initial supporting structure body. By adopting a construction method of the asymmetric supporting structure, bias tunnel deep-buried side supporting linings are strengthened, the stress situation of the tunnel liningscan be effectively improved, construction is convenient, the construction progress is fast, economic rationality is achieved, and the shallow-buried bias tunnel asymmetric supporting structure can safely and quickly pass through a shallow-buried bias section.

Description

Technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to an asymmetric supporting structure and a construction method for a shallow buried unsymmetrical pressure tunnel. Background technique [0002] In recent years, with the continuous development of tunnel engineering in my country, in the current planning and design process of mountain tunnels, due to the geological and topographical conditions and line direction, the tunnel engineering inevitably runs along the valley, so more and more Many shallow buried bias tunnels. The excavation of shallow-buried and biased tunnels has always been a major problem in the geotechnical engineering industry. After the excavation of the tunnel, due to the poor self-supporting capacity of the surrounding rock, the stress of the surrounding rock on both sides of the tunnel section is very different, which causes the tunnel to generate bias. The emergence of these conditions has increased the d...

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Problems solved by technology

However, these additional pre-reinforcement measures consume a lot of materials, are difficult to construct, have a long construction period, and are greatly restricted by the terrain. Moreover, the damage to the surrounding environment of the tunnel site and the resulting economic and time costs cannot be ignored.

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