Tunnel structure suitable for composite stratum with soft upper part and hard lower part and construction method

Abstract

The invention provides a tunnel structure suitable for a composite stratum with a soft upper part and a hard lower part and a construction method. The tunnel structure comprises a composite type lining wall, two groups of separating beams, two vertical lining walls, an inverted arch and leakage protective systems; the composite type lining wall is fixedly connected with a roadway loose and soft stratum; the two groups of separating beams are arranged at the boundary positions of the loose and soft stratum and a hard stratum in the roadway separately and are fixedly connected with the bottom end of the composite type lining wall separately; the two vertical lining walls are fixedly connected with the separating beams separately; the inverted arch is arranged at the bottom of the roadway andis connected with the vertical lining walls separately; and the leakage protective systems are arranged between the vertical lining walls and the side wall of the roadway, on the inverted arch and inthe composite type lining wall and are used for treating underground water in the roadway. The tunnel structure and the construction method improve the construction safety and solve the problem thatdesign, construction and cost control of the tunnel structure at the loose and soft composite stratum are difficult to simultaneously consider.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and more specifically relates to a tunnel structure and a construction method suitable for upper-soft and lower-hard composite formations. Background technique [0002] When the tunnel and underground engineering are developed to the deep, the upper stratum at the excavation section is relatively soft and the lower stratum is relatively hard. This kind of composite stratum is the upper soft and lower hard composite stratum. [0003] When constructing tunnels in such strata, the upper surrounding rock has poor bearing capacity and is difficult to self-stabilize. The arch is prone to collapse during excavation, and the construction safety risk is extremely high; the lower surrounding rock is extremely hard and difficult to excavate. Tunnel structures and construction methods are difficult to adapt to this kind of upper-soft and lower-hard composite strata, so it is necessary to propose s...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a tunnel structure and construction method suitable for upper-soft and lower-hard composite strata. Hard stratum is difficult to carry out construction, and the existing tunnel structure and construction methods are difficult to apply to the technical problem of the composite stratum with soft top and hard bottom

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