Test device of vertical structure model of shield tunnel

Abstract

The invention relates to test device of a vertical structure model of a shield tunnel. The test device comprises a counterforce frame, end constraint pieces, loading pieces and data acquisition equipment. The end constraint pieces and the loading pieces are arranged on the counterforce frame, a shield tunnel mode is fixed on the end constraint pieces, the loading pieces apply load above the shield tunnel model to enable the shield tunnel model to deform, and the data acquisition equipment is connected with the shield tunnel model to acquire and process deformation data. Compared with the prior art, the test device is tunnel structure stress simulation, changes the idea that a tunnel is buried inside a rock-soil body in a traditional model test, is convenient and fast to assemble and disassemble, small in occupied area and space, and accurate in measuring data.

Description

technical field [0001] The invention relates to an underground building structure test device, in particular to a shield tunnel longitudinal structure model test device. Background technique [0002] With the rapid development of the national economy and the acceleration of urbanization in my country, shield tunneling projects have developed rapidly, especially in rail transit projects in large and medium-sized cities and cross-sea and cross-river highway and railway projects. The tunnels that have been put into operation have shown Different degrees of disease development. This is because the segment structure and joints of shield tunnels at home and abroad are generally designed by the "typical cross-section" method, which makes it difficult to consider the long-term interaction between the soil and the longitudinal structure of the tunnel, and thus it is difficult to predict the influence of tunnel longitudinal deformation on the longitudinal mechanical properties of the t...

AI Technical Summary

Problems solved by technology

[0003] Scholars at home and abroad have done little research on the model test of the longitudinal structure of shield tunnels. At the same time, the existing model tests of the longitudinal structure of shield tunnels generally have many problems such as difficult data collection, poor test repeatability, and high economic costs.

Existing tunnel longitudinal structure model tests often embed the tunnel model in the soil box. Considering the particularity of rock and soil mass, the existing tunnel longitudinal structure model test often suffers from the large workload of filling and unearthed soil for model testing and the difficulty of model testing. The period is long, the repeatability of model tests is poor, and the economic cost of model tests is high. It is difficult for the model test device system to effectively simulate the impact of changes in tunnel boundary conditions on the longitudinal mechanical properties of the tunnel, and it is difficult for the model test device system to effectively simulate the impact of different constraint stiffnesses at the longitudinal end of the tunnel

[0004] The traditional shield longitudinal model test device system usually adopts the form of soil box. The model is placed in the test soil medium, and the soil surrounds the tunnel model so that the tunnel model is invisible. not measurable

Research on the longitudinal performance of the tunnel cannot be further developed

[0005] At the same time, the traditional shield longitudinal model test device system usually adopts the form of an earth box, and the tunnel model is buried inside the rock and soil, which makes it difficult to collect data on the longitudinal settlement and lateral convergence of the model tunnel; considering that the buried rock and soil The influence of factors such as water content makes it difficult to collect stress-strain data of the model tunnel during the test

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