A kind of upper soft lower hard stratum tunnel support structure and construction method thereof

Abstract

The invention relates to the technical field of tunnel construction, in particular to an upper-soft lower-hard stratum tunnel supporting structure and a construction method thereof. The structure comprises a pipe roofing structure and a supporting structure; the pipe roofing structure comprises multiple steel pipes which form an arch structure arranged on the upper portion of a tunnel in a covering mode; two steel plates between every two adjacent steel plates are arranged in a parallel and spaced mode in the radial direction of the tunnel, a space between the every two steel plates is communicated with internal spaces of the corresponding steel pipes through mounting grooves formed in the side walls of the steel pipes, and the steel plates and the steel pipes together form arch communication cavities; concrete is poured into the communication cavities; the upper end of the supporting structure is supported on the two steel pipes at the bottommost end. By means of the arch pipe roofing structure, the strength of a soft soil layer is enhanced, the problem that a soft soil layer tunnel under construction is prone to collapse is solved, by means of the primary support and secondary lining structure, the flexibility of construction is enhanced, the influence on the earth surface is reduced, the construction safety is high, the construction efficiency is improved, and great popularization value is achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a support structure and a construction method for a tunnel in upper soft and lower hard strata. Background technique [0002] Tunnel construction generally adopts mining method, shield (jacking) method, open cut method and other construction methods. Among them, the mining method is generally applied to tunnels with good geological conditions and good self-stability of surrounding rock. When the upper soft and lower hard strata need to be constructed using the mining method, the soft stratum is difficult to self-stabilize, and it is easy to collapse and deform under the action of the upper load. The existing mining method tunnel construction in upper soft and lower hard strata needs to reinforce the soft stratum in a certain range around the tunnel, and then construct under the protection of the reinforced stratum and advanced support. The existing technology can sa...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of complex structure, difficult construction, poor stability, difficult to meet the requirements of settlement control and poor safety control in the prior art support structure mentioned in the above background technology, and to provide a kind of upper soft lower Tunnel support structure and its construction method in hard ground

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