Visualized single-circle shield synchronous grouting grout diffusion model research platform and its application

Abstract

The invention provides a visual single-circle shield tunneling synchronous grouting slurry diffusion mode study platform, which comprises a model box device, a synchronous grouting physical process simulation test device and a PIV (Particle Image Velocimetry) digital image processing system, wherein the model box device provides a space for the whole test; the synchronous grouting physical process simulation test device is connected with the model box device, and is used for realizing the control on the synchronous grouting process and simulating the actual grouting process; and the PIV digital image processing system is used for observing and recording the diffusion process of slurry in a shield tail gap to obtain test data for analysis. According to the application of the platform, the physical diffusion of the synchronous grouting slurry in internal environment of a visual soil body is realized, and the commercial PIV digital image processing system is used for directly observing, recording and displaying the diffusion process of the synchronous grouting slurry. The platform has the advantages that the dynamic complicated diffusion process of the single-circle shield tunneling synchronous grouting slurry is integrally observed in an indoor test for the first time, and an effective study platform is provided for the single-circle shield tunneling synchronous grouting theory and control technology in different stratum.

Description

technical field [0001] The invention belongs to the field of tunnels and underground engineering, and relates to synchronous grouting and control technology suitable for shield tunnels. Background technique [0002] During the construction of the shield tunnel, with the continuous excavation of the shield machine, the assembled segment located inside the shield shell will come out of the shield shell. Since the outer diameter of the shield machine is larger than that of the segment, it is inevitable to form a certain Thickness of the annular space, known as shield tail gap. For single-circular shield mechanical synchronous grouting hole layout position is generally a Cartesian coordinate system oblique 45-degree angle symmetrical arrangement Synchronous grouting ideally fills the shield tail gap completely and does not cause soil disturbance to the surrounding strata, the stratum deformation is well controlled However, when the actual engineering shield advances and injects...

AI Technical Summary

Problems solved by technology

For single-circular shield mechanical synchronous grouting hole layout position is generally a Cartesian coordinate system oblique 45-degree angle symmetrical arrangement Synchronous grouting ideally fills the shield tail gap completely and does not cause soil disturbance to the surrounding strata, the stratum deformation is well controlled However, when the actual engineering shield advances and injects grout synchronously, the soil outside the shield tail gap is also deformed synchronously. However, this dynamic nonlinear complex physical process is difficult to be effectively deduced through theory, and at the same time, the experimental observation is difficult to observe due to the constraints of grouting inside the soil

[0003] At present, there is no report on the model test research of synchronous grouting grout diffusion mode by establishing a visual environment

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