Visual test device for simulating shield tunneling under existing tunnel construction

Abstract

A visual test device for simulating shield tunneling under the construction of an existing tunnel, comprising a model box, an existing tunnel model, an adjustment system and a test process measurement system. The simulated stratum prepared with transparent soil is installed in the model box, and all simulated construction processes are carried out in the model box. The existing tunnel model is simulated by polyethylene plastic pipes according to the principle of similar elastic modulus. The model tunnels are distributed throughout the interior of the model box, and the two ends of the tunnel are fixed on both sides of the inner surface of the model box. The adjustment system is designed as a segmented movable door adjustment system. The test process measurement system is composed of six subsystems: the movable door displacement measurement control system, the soil surface settlement measurement system, the soil internal displacement field measurement system, the earth pressure measurement system, the tunnel surface pressure distribution test system and the tunnel displacement measurement system. The data collected by the system is provided to the computer PC for data analysis. In order to study the mechanism of formation disturbance in the whole process of shield tunneling construction.

Description

technical field [0001] The invention belongs to the field of tunnel and underground engineering. Background technique [0002] With the rapid development of urban rail transit, the subway network has gradually formed and expanded, and a large number of new subway lines have begun to cross or pass through municipal pipelines and existing lines. attention from engineering and academia. Restricted by geological environment conditions and construction technology, shield tunneling of new tunnels will inevitably disturb the surrounding strata. Existing tunnels are prone to problems such as longitudinal uneven settlement, segment cracking, ballast bed disengagement, and joints under disturbance of the surrounding soil. Damage, water leakage and other problems endanger driving safety. However, the underpassing of the existing shield tunnel by shield tunneling is a complex system behavior involving multiple factors and multiple couplings and the complex interaction between structur...

AI Technical Summary

Problems solved by technology

However, the above-mentioned invention only studies the deformation of the existing tunnel caused by the underpassing of the shield tunnel, and it is too much simplified as a theoretical calculation model. The stress state and displacement field of the stratum soil during the underpassing construction, it is difficult to show the interaction response between the stratum soil and the existing tunnel during the underpassing process

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