Composite lining structure for super-large-span pile-foundation-joist-based bearing arched tunnel and construction method thereof

Abstract

The invention provides a composite lining structure for a super-large-span pile-foundation-joist-based bearing arched tunnel and a construction method thereof. With the structure, the force-bearing state is clear and construction becomes convenient; and a problem of lining cracking caused by excessive arched structure sedimentation because of difficult control of super-large-span tunnel arch springing displacement on the complicated geological condition can be solved, so that stability and security of tunnel construction and operation can be guaranteed. The structure comprises a forepoling structure, a preliminary bracing structure, and a secondary bracing structure that are arranged from inside to outside. Left-side arch springs of the preliminary bracing structure and the secondary bracing structure are supported on a left-side joist and are connected with the left-side joist and right-side arch springs of the preliminary bracing structure and the secondary bracing structure are supported on a right-side joist and are connected with the right-side joist. A left-side pile foundation and a right-side pile foundation are arranged at an interval under the left-side joist and the right-side joist along an extending direction of the tunnel; and the upper ends of the left-side pile foundation and the right-side pile foundation are fixedly connected with the left-side joist and the right-side joist and the lower ends are arranged in a stable rock and soil strata of a foundation.

Description

technical field [0001] The invention relates to tunnel excavation and support, in particular to a super-large-span pile foundation joist bearing arched tunnel composite lining structure and a construction method thereof, which is suitable for super-long-span tunnels, especially for complex geological conditions with large overlying loads and strata Ultra-long-span tunnels with strict settlement control. Background technique [0002] After entering the 21st century, my country's railway construction has developed rapidly. With the rapid and large-scale construction of high-speed railways in the southwest mountainous areas, due to the constraints of various factors such as large curve radius, complex terrain and geological conditions, and high environmental protection requirements, some sections along the railway line have been designed. The station conditions are extremely difficult. Therefore, in order to improve the freedom of route selection and station setting for high-sp...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a composite lining structure of super-long-span pile-based joist bearing arched tunnels. The problem of lining cracking caused by excessive settlement of the arch structure to ensure the stability and safety of tunnel construction and operation

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