A kind of tunnel construction method

Abstract

The invention relates to a tunnel construction method and belongs to the technical field of tunnel construction. The method includes: during the construction of the main tunnel, after detecting the presence of water, develop the first small conduit tunnel around the main tunnel, and carry out the drainage operation through the first drainage outlet; , the water pressure drops to the set threshold, then continue to drain water, and when the water pressure meets the construction requirements, grouting is used to strengthen the surrounding rock; The second small conduit tunnel is developed above the first small conduit tunnel, and the drainage operation is performed through the second outfall; then grouting is performed through the second outfall, and the water conduction fault between the first outfall and the second outfall Carry out sealing; after sealing, the surrounding rock is reinforced by grouting, and the TBM passes through at a low speed. The invention proposes an effective scheme for tunnel construction encountering water-conducting faults, and ensures that tunnel construction can be carried out safely in geologically harsh environments.

Description

technical field [0001] The invention relates to a tunnel construction method and belongs to the technical field of tunnel construction. Background technique [0002] Full-face Tunnel Boring Machine (TBM for short) includes hard rock TBM and soft ground TBM. Soft ground TBM generally refers to a shield machine, so the TBM we often say generally refers to a tunnel boring machine suitable for hard rock excavation. At present, for mountain tunnels with complex strata, especially those with more unstable strata, hard rock TBMs are mostly used for tunnel construction. Hard rock TBMs use the hob on the rotary cutter to squeeze and shear the rock, The bucket teeth on the top pick up the stone slag, drop it on the belt conveyor of the main machine and transport it backward, and then transport the slag out of the cave by pulling the slag truck or the continuous belt conveyor in the tunnel. [0003] For the tunnel construction process, when water seepage occurs in the tunnel, drainage...

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Problems solved by technology

For example, in the geological conditions of the alpine region, the buried depth of the tunnel is large, the length of the tunnel is long, and the scale is generally large, and there are a large number of water-conducting faults that connect the upper water body and the ice lake. During the construction process, the water cannot be completely drained through drainage treatment. If the construction is forced to continue, the tunnel will leak water, and if the aqueduct is exposed, it is very likely that the aqueduct will be flooded with mud and water, and even a large number of engineering accidents will submerge the tunnel. The consequences are disastrous

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