Construction method suitable for up-down overlapped tunnel with small clear space and long distance under weak geological condition

Abstract

The invention discloses a construction method suitable for an up-down overlapped tunnel with the small clear space and long distance under the weak geological condition. The up-down overlapped tunnel comprises an upper hole tunnel body and a lower hole tunnel body, wherein the tunnel diameter of the upper hole tunnel body is the same as that of the lower hole tunnel body, and the tunnel length of the upper hole tunnel body is largely equal to that of the lower hole tunnel body. Both the upper hole tunnel body and the lower hole tunnel body are of a tunnel structure formed by tube pieces, the vertical clear space between the upper hole tunnel body and the lower hole tunnel body is smaller than 0.7D(shield diameter), and the tunnel length is larger than 1000 m. The shield construction method includes the steps that after the lower hole tunnel body is completed according to a conventional shield construction method, the measures of a shield high-altitude starting platform, up-down tunnel interlayer soil body deep hole grouting reinforcement, lower hole tunnel supporting steel ring reinforcement, a shield high-altitude receiving platform and the like are taken, so that the influence on the formed lower hole tunnel body by shield construction of the upper hole tunnel body and the secondary overlapping effect of overlapped tunnel sedimentation are reduced, and it is guaranteed that deformation of the lower hole tunnel body and ground subsidence can be controlled. The overlapped tunnel shield construction method is of great reference value and practical significance to similar shield tunnel engineering and intensive deep-layer underground space exploitation and utilization.

Description

technical field [0001] The invention relates to an overlapping tunnel construction method, in particular to a reasonable, safe and reliable construction method for overlapping tunnel shielding, and belongs to the field of municipal tunnel engineering. This method is suitable for shield construction of overlapping tunnels in similar projects. Background technique [0002] With the development of China's economy and cities, urban functional divisions become more obvious, and traffic flow increases, but the available ground land resources are becoming more and more limited or even insufficient to support engineering construction. Originally, due to complex geological conditions or Areas that were avoided by factors such as insufficient venues and complex surrounding environments must now be faced. When the subway line passes through the city center or the old district, the site conditions are narrow, and the line design of overlapping tunnels in the complex surrounding environ...

AI Technical Summary

Problems solved by technology

So far, there is no forming theory and practical technology in China that can be applied to similar engineering constructions, especially under the conditions of relatively harsh geological conditions and complex surrounding environments, the construction of overlapping tunnel shields is still a major technical problem that needs to be solved urgently

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