Model test device of shield tunnel uplifting mechanism

Abstract

The invention provides a model test device of shield tunnel uplifting mechanism. The model test device comprises a main soil box for accommodating test soil, a tunnel model segment, a latex film for sealing and connecting the tunnel model segment, a displacement meter for measuring the tunnel uplifting amount, a displacement meter bracket for fixing the displacement meter, weights inside a tunnel for simulating excavated soil, a latex film fixing plate for fixing the latex film and a rubber ring for hooping the latex film. The model test device is an indoor model test device capable of simulating the tunnel uplift when the tunnel soil is evacuated, can obtain uplifting rules of the tunnel in the case of different soils, different soil coverage depths and different excavation lengths, so that the model test results achieve the purpose of effectively and accurately reflecting the site construction conditions.

Description

technical field [0001] The invention relates to a test device used in the technical field of construction engineering, in particular to a model test device for the floating mechanism of a shield tunnel. Background technique [0002] With the rapid development of urban traffic, tunnels have become a very important part of urban traffic, and in areas with many rivers, cross-river tunnels have been widely used in river-crossing projects in recent years because they are not affected by shipping constraints and meteorological conditions. During the construction of shield tunnels, for segments that have just left the tail of the shield, partial or overall uplifts often occur, manifested as segment misalignment, cracks, damage, and even axis deviation, especially when crossing the shallow overlying soil at the bottom of the river , this problem is particularly prominent, and has brought great potential safety hazards to tunnel construction. [0003] The research methods for tunnel...

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Problems solved by technology

[0005] In view of the defects in the prior art, the purpose of the present invention is to provide a model test device for the floating mechanism of shield tunnels, which overcomes the problem that the existing indoor model test devices can only study the floating problem of the tunnel on the plane problem and cannot simulate Defects in the excavation process of the soil under the real conditions of on-site construction, to obtain the law of the tunnel's uplift when different soils, different covering depths, and different excavation lengths, so that the model test results can more effectively and accurately reflect the on-site construction conditions

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