A kind of subway shield construction disturbance model test device and its test method

Abstract

The invention discloses a subway shield construction disturbance model test device and a test method thereof. The subway shield construction disturbance model test device comprises a model tank, a simulated driving system, a grouting system and a monitoring system, wherein the model tank is filled with a soil body; the simulated driving system is mounted in the soil body; the grouting system is connected with the simulated driving system; the monitoring system is embedded in the soil body in the model tank and is used for acquiring parameters before and after soil body test disturbance; modulation slurry is put in a slurry storage barrel, and a simulated shield shell is horizontally drawn out at a shield speed according to simulation conditions; meanwhile, the slurry is injected to the periphery of a simulated lining through a grouting pump; the monitoring system is used for acquiring monitoring data; the middle part of the model soil body is cut off, and test results of the slurry in the soil body within a dispersion range are obtained through section observation. The test device used in the invention can be reused, a synchronous grouting process under different working conditions is repeatedly stimulated at a lower cost, the measured data is more complete, a reference is provided for actual construction, and the study on a mechanism and a principle of surrounding soil body disturbance effect are favorably promoted.

Description

technical field [0001] The invention relates to a subway shield construction disturbance model test device and a test method thereof, which belong to the technical field of underground construction engineering and are used for indoor simulation test research on subway shield construction disturbance. Background technique [0002] During the construction process of the shield method, as the shield machine continues to excavate the segments, they are also installed at the shield tail. Since the outer diameter of the segment is smaller than the outer diameter of the shield shell, gaps are constantly generated at the shield tail. Due to the poor self-stabilization ability of the soft clay around the tunnel, if the shield tail gap is not filled in time, the surrounding strata will collapse and deform. Among them, the control technology of grouting parameters such as grouting pressure and grouting volume is the key. If the grouting pressure and grouting amount are too small to me...

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Problems solved by technology

[0003] On-site in-situ test has the characteristics of high detection cost, large labor investment, long measurement period, complex site conditions, large soil heterogeneity, unstable construction parameters, etc., and the data obtained from the field test are highly discrete.

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