A new bottom structure suitable for heavy-duty railway tunnels with rich water and soft rock

Abstract

A new type of bottom structure suitable for heavy-duty railway tunnels in rich water, soft rock, including tunnels and pile-beam slab structures. Primary support and secondary lining are arranged on the inner surface of the tunnel in sequence from outside to inside. There is a reserved amount of deformation between the secondary lining and the secondary lining. The secondary lining includes arch rings, side walls and inverted arches. There is an enlarged wall foot at the bottom of the side wall. There is a drainage channel between the two enlarged wall feet. The pile-beam-slab structure is set in the drainage channel. The pile-beam slab structure includes cast-in-place slabs, support frames and piles. The piles are evenly distributed in the drainage channel. The lower ends of the piles pass through the inverted arch and are fixed on the bedrock below the invert. Rack the end face. The cast-in-place slab bears the train load transmitted through the ballast bed, and then transmits the load to the stable bedrock below the groundwater level through longitudinal beams, beams and piles, which prevents groundwater from participating in the force transmission of the system.

Description

technical field [0001] The invention relates to the field of tunnels, in particular to a novel bottom structure suitable for heavy-duty railway tunnels with rich water and soft rock. Background technique [0002] In the construction of heavy-duty railway tunnels in rich water and weak surrounding rock, in order to ensure the stability of the tunnel structure and the vibration impact of heavy-duty trains, the conventional structure is curved wall lining with inverted arches. [0003] In this type of tunnel lining system, the lining and the surrounding rock share the surrounding rock pressure, and the invert part of the lining bears the train load transmitted through the ballast bed and the invert filling, that is, the lining must bear the surrounding rock pressure and the train load at the same time. In ordinary (no special geological) tunnels, such a structure can meet practical needs. [0004] For heavy-duty railway tunnel projects built under rich water and weak surroundi...

AI Technical Summary

Problems solved by technology

At this time, there must be water (that is, the groundwater between the filling and the inverted arch, or between the inverted arch and the base) in the stress system bearing the train load. Under the repeated action of the train load, the structure at the bottom of the tunnel will be damaged. If it is a super-long and heavy-duty tunnel with integral ballast bed, it may cause fatal and immeasurable losses to the tunnel operation

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