Mining method tunnel supporting structure capable of downward penetrating operating G-series high-speed train and construction method thereof

Abstract

The invention discloses a mining method supporting structure capable of downward penetrating an operating G-series high-speed train. The mining method supporting structure comprises a pipe curtain structure, a preliminary bracing and a secondary lining; the secondary lining is positioned on the inner side of the preliminary bracing; the pipe curtain structure is positioned on the outer side of thepreliminary bracing and is distributed on the top and side edge of the preliminary bracing; temporary support steel frames transversely and longitudinally arranged in a staggered manner are further arranged in the tunnel and serve as tunnel excavated temporary supports; end ring beam structures are arranged on the tops of constructed section structures at the two ends of the tunnel; and the two ends of the pipe curtain structure are fixed to the corresponding end ring beam structures as support points. The invention further discloses a construction method of the mining method supporting structure capable of downward penetrating an operating G-series high-speed train. Preliminary bracing, temporary support and secondary lining are combined to serve as a tunnel support structure; and in addition, a pipe curtain is adopted as pre-supporting, a segment excavation construction method is adopted in the tunnel, and compared with a common mining method tunnel, the mining method supporting structure has the advantages of being high in sedimentation control capacity and safe and reliable in construction.

Description

technical field [0001] The invention belongs to the technical field of mining tunnel construction, and more specifically relates to a mining tunnel support structure and a construction method for passing high-speed rail under operation. Background technique [0002] With the rapid development of transportation infrastructure construction, newly-built tunnels encounter more and more complex working conditions that pass through railways, buildings, highways and other ground structures. Especially under the railway line in operation, especially the high-speed railway, if the engineering measures are not properly selected, it may cause large surface settlement or uneven settlement, which may cause the line to deform beyond the limit and require speed limit operation, and cause serious safety accidents , pose a serious threat to people's lives and property safety. [0003] At this stage, various types of tunnels have large cross-sections. On the one hand, they face complex geolo...

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Problems solved by technology

[0004] However, at present, there are the following problems in using the pipe curtain method to pass through important facilities: For rectangular tunnels with high requirements for settlement control, such as high-speed railways, generally use jacking after track underpinning or open-cut and cast-in-place construction, and rarely choose mines law construction

First of all, conventional pipe-curtain-assisted underground excavation construction technology, for rectangular-section tunnels, only relying on the pipe-curtain structure as advance support, it is difficult to guarantee the safety of the tunnel construction period and the safety of surface structures; For extremely sensitive projects, the conventional tunnel construction with pipe curtain method may cause excessive ground settlement and affect the operation of the railway. In terms of settlement control, it is necessary to take corresponding auxiliary measures to deal with it. At the same time, it is necessary to combine the current tunnel section form and size changes Solve the safety problems of large-section tunnel construction in various situations

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