A construction method for shallow-buried arc-shaped variable-section tunnels in rock-filled strata

Abstract

The invention discloses a shallow-buried underground excavation construction method for arc-shaped variable-section tunnels in rock-filled strata. The shallow-buried underground excavation construction method includes steps of excavating and constructing first vertical shafts and second vertical shafts; building first-group pipe sheds in the first vertical shafts until the first-group pipe sheds reach second pipe shed work rooms, and building second-group pipe sheds in the second vertical shafts until the second-group pipe sheds reach first pipe shed work rooms; carrying out underground excavation construction until the second-group pipe sheds reach the first pipe shed work rooms; changing pipe shed construction directions in the first pipe shed work rooms and building third-group pipe sheds; lapping top pipe sheds of the third-group pipe sheds with the first-group pipe sheds and allowing lateral pipe sheds of the third-group pipe sheds to exceed the second pipe shed work rooms and completely carrying out advanced pipe shed support on the second pipe shed work rooms; carrying out underground excavation construction until the third-group pipe sheds reach the second pipe shed work rooms; building lateral pipe sheds of fourth-group pipe sheds in the second pipe shed work rooms and completely carrying out advanced pipe shed support on arc-shaped widened section tunnels. The shallow-buried underground excavation construction method has the advantages that the pipe shed work rooms are set, the pipe sheds of the arc-shaped variable-section tunnels are built and lapped in oppositedirections, and accordingly the difficult problem of incapability of constructing advanced pipe sheds when shallow-buried underground excavation construction is carried out on existing arc-shaped variable-section tunnels can be solved by the aid of the shallow-buried underground excavation construction method.

Description

technical field [0001] The invention relates to the technical field of tunnel construction methods, in particular to a construction method for shallow-buried tunnels with arc-shaped variable cross-sections in rock-fill formations. Background technique [0002] With the development and construction of urban underground space, there are more and more projects such as urban underground ring roads, vehicle communication passages, and street crossing tunnels, such as the underground road of Wangjiadun Business District in Wuhan, the Wanbo underground ring road in Panyu, and the Qianhai underground ring road in Shenzhen. , Urban underground construction generally adopts construction methods such as open cut method, mine method, shield method, pipe jacking method, shallow buried and underground excavation method. [0003] The open cut method is to excavate foundation pits or trenches from the surface down to the design elevation, then pour underground structures at the excavated pr...

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Problems solved by technology

[0010] The object of the present invention is to provide a construction method for shallow-buried arc-shaped variable-section tunnels in rock-filled strata to solve the problems existing in the above-mentioned prior art, and to solve the problem of arc-shaped variable-section tunnels in rock-filled strata that do not have open excavation conditions in urban areas. The problem that the tunnel cannot be constructed

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