Anti-settlement structure for large-section tunnel base under loose rock heap body stratum and construction method

Abstract

The invention discloses an anti-sedimentation structure for a large-section tunnel base under a loose rock heap body stratum and a construction method. The anti-sedimentation structure comprises a tunnel primary support, a tunnel secondary lining, an inverted arch primary support, an inverted arch secondary lining, an inverted arch filling concrete layer and a reinforced concrete connecting pipe. The high-pressure jet grouting piles are connected with the bedrock stratum, and the reinforced concrete connecting pipe is connected with the tunnel secondary lining, the inverted arch primary support and the inverted arch secondary lining. Compared with the prior art, the high-pressure jet grouting piles can be connected with the tunnel inverted arch structure through the reinforced concrete connecting pipes, and the high-pressure jet grouting piles can serve as a structure to bear loads together with the tunnel inverted arch structure while a soil body below a tunnel base is reinforced.

Description

technical field [0001] The invention relates to the technical field of construction of a large-section tunnel under a loose rock pile stratum, in particular to an anti-subsidence structure and a construction method for a base of a large-section tunnel under a loose rock pile stratum. Background technique [0002] During the construction of urban tunnels, in order to reduce the impact of construction on the surrounding environment, the settlement and deformation of the tunnel and the surrounding surface must be strictly controlled. At the same time, due to frequent human activities in urban areas, there are a large number of earth and rock excavation and filling areas, which are sometimes impossible during tunnel construction. Avoid crossing these areas, ie unconsolidated rock formations. The loose rock mound is mainly composed of silty clay and crushed stones, with a small amount of plant roots, loose structure and poor stability of the rock mass. After the excavation of th...

AI Technical Summary

Problems solved by technology

Loose rock mounds are mainly composed of silty clay and crushed stones, with a small amount of plant roots, loose structure, and poor stability of the rock mass

After the excavation of the tunnel, the self-stabilization time of the surrounding rock is short. When there is no support or the support is not in place, it is easy to cause block falling or large collapse, etc., and the local section is easy to fall off, and it is easy to cause the rock pile to be unstable.

Due to the extremely loose rock mass and low bearing capacity, the disturbance of the early excavation will cause long-term consolidation settlement. After the construction of the tunnel lining, it is likely to cause cracking, deformation, and even erosion due to large uneven settlement.

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