Ground fracture region shield tunnel based on back pouring enlarged head type and construction method thereof

Abstract

The invention relates to a ground fracture region shield tunnel based on a back pouring enlarged head type and a construction method thereof. The tunnel comprises a tunnel lining structure composed ofshield tunnel pipe piece linings, back pouring type inner convex enlarged heads are annularly arranged a the two sides on a shield segment circular seam, anchor holes are pre-embedded by the back pouring type inner convex enlarged heads by means of the pipe segment linings, the component overlapping mode is adopted, effective connection with the pipe segment linings is achieved, a special deformation seam is formed at the joint of the inner convex enlarged heads on the two sides of the pipe segment circular seam, the special deformation seam is strictly aligned to the pipe segment circular seam, grouting pipes are pre-embedded on an inner convex enlarged plug, the pre-embedded grouting pipes are strictly aligned to pipe segment grouting holes, a hollow type circumferential water stop is additionally arranged in the special deformation seam, and the seam waterproof capability is improved. The shield tunnel is adopted for directly penetrating through the ground crack region, the inner convex enlarged heads are poured into the shield tunnel, the requirement for stratum large deformation is met, meanwhile, the project quality and surrounding safety are improved, and tunnel construction method continuity and project risk are effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a shield tunnel in a ground fissure area based on a post-cast expanding head type and a construction method thereof. Background technique [0002] For the current rail transit projects in major cities in China, due to geological structures and human activities, there are different degrees of fault zones or broken areas in the strata, and they show certain instability and continuous deformation characteristics in the long-term process, especially in recent years. The geological movement caused by the excessive exploitation of groundwater in major cities is a major controlling factor for urban rail transit projects with extremely limited boundary conditions. Based on the characteristics of stratum activity and the technical characteristics of the shield tunneling method, when the tunnel project passes through the ground fissure area, it is generally considere...

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Problems solved by technology

Based on the characteristics of stratum activity and the technical characteristics of the shield tunneling method, when the tunnel project passes through the ground fissure area, it is generally considered as a mine tunnel. Under the premise of considering the maximum deformation of the ground within the design period, the tunnel headroom is correspondingly enlarged, but due to the ground fissure area The geological conditions are poor, and the mining method tunnel is not conducive to engineering risk control and environmental protection, is not conducive to project investment control, and is not conducive to project quality control. As similar projects continue to appear all over the country, the disadvantages brought by conventional mining method tunnel solutions are becoming more and more serious. more obvious

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