A large-diameter shield tunnel displacement control device and its working method

Abstract

The invention discloses a large-diameter shield tunnel displacement control device and its working method. The device includes a drainage pipe, a drainage pump, a storage and drainage tank and a control system; The drainage reduces the pore water pressure in the soil layer at the bottom of the shield tunnel to reduce the buoyancy of the shield tunnel, and at the same time increases the water storage capacity of the storage and drainage tank to increase the self-weight of the shield tunnel, and comprehensively prevents the floating of the shield tunnel; by reducing the water storage and drainage The water storage in the tank is used to reduce the self-weight of the shield tunnel. If necessary, the groundwater is refilled into the soil layer at the bottom of the shield tunnel through the downspout pipe to increase the pore water pressure in the soil layer and increase the buoyancy of the shield tunnel to achieve comprehensive The purpose of controlling the sinking of the shield tunnel: the invention can effectively control the floating or sinking of the large-diameter shield tunnel caused by complex hydrogeological conditions and surrounding construction.

Description

technical field [0001] The invention relates to the technical field of tunnel displacement control, in particular to a large-diameter shield tunnel displacement control device and a working method thereof. Background technique [0002] With the rapid development of social economy and the substantial improvement of urbanization level, the inefficient traffic mode of "single hole and single track" shield tunnels with conventional diameters (mainly Φ6.0m and 6.2m) can no longer meet the growing traffic pressure. The multi-level, intensive and three-dimensional driving modes such as "double-holes and double-lines" and "public-rail mixed traffic" corresponding to large-diameter shield tunnels can greatly increase vehicle traffic efficiency, relieve traffic pressure, and also integrate measures according to local conditions, such as traffic , business, leisure, entertainment and other urban functions, and to explore the development potential of underground space to a greater exten...

AI Technical Summary

Problems solved by technology

The local uplift or subsidence of the tunnel will affect the stability of driving, and will also cause cracks or misalignment between segments in the displacement transition section. In severe cases, it will lead to bolt breakage, joint damage, partial fragmentation and cracks in the shield tunnel. Expansion and other diseases, and even cause damage to the main structure of the tunnel, posing a threat to the operation safety of trains or vehicles in the shield tunnel

At present, there are no effective prevention and treatment measures for the displacement of large-diameter tunnels. Usually, after the over-limit displacement occurs, local targeted reinforcement treatment is carried out.

Images