A test device and method for simulating stratum loss caused by stratum voids in subway shield tunnels

Abstract

The invention discloses a test device and method for simulating stratum loss caused by stratum voids in subway shield tunnels. The first conduit (12) and the second conduit (21), the container (17) corresponding to the second conduit (21), the resistance wire (13) that is arranged inside the polychloramine liquid bag (11), the connecting resistance wire The heating control device (20); the visual recognition system includes: a real-time monitoring camera (1), a fixed bracket (2) and an acquisition computing module (3), and the real-time monitoring camera (1) is used to shoot video images of the monitoring interface, and the video images It is transmitted to the acquisition and calculation module (3) for analysis and calculation to obtain the displacement data of the point of interest, and also includes a curtain (4) covering the entire test device and a light source (5) with a fixed position. Particle settlement is monitored in real time.

Description

technical field [0001] The invention belongs to the technical field of underground engineering tests, and in particular relates to a test device and method for simulating formation losses caused by formation voids in subway shield tunnels. It can simulate the surface settlement and the subsequent stratum loss process caused by stratum voids caused by over-excavation in shield construction, providing a basis for construction and design optimization. Background technique [0002] Today, the subway has developed rapidly due to its advantages of economy, comfort, convenience, and speed, and the shield tunneling method, as the most effective method for subway construction, has also developed rapidly. After development, it has been basically sound, forming a complete set of sound technical theories. However, the disturbance of the surrounding stratum caused by the construction process, resulting in the release of stratum pressure and stratum deformation, still exists. These prob...

AI Technical Summary

Problems solved by technology

[0004] 1. At present, most of the research is still on the research of surface subsidence. There is no simple, accurate and intuitive method for monitoring the particle displacement in the stratum caused by stratum voids, so the relationship between the stratum loss and the deformation of the upper soil cannot be obtained. There is no effective experimental data for studying the mechanism of formation loss

[0005] 2. Due to the principle of the test, there are problems such as centrifugal field radial and tangential errors, particle size effects, boundary effects, etc., so that the experimental results deviate from the prototype and cannot accurately reflect the change process of formation loss

[0006] 3. Although there have been some simulations of formation loss, there are quite a lot of simulation problems, and the system is relatively scattered and messy, and a sound and effective system has not been formed.

And the test efficiency is not high

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