Visual observation testing system and method for flow characteristics of muck in soil chamber of single-circle shield

Abstract

The invention relates to a visual observation testing system for flow characteristics of muck in a soil chamber of a single-circle shield. The visual observation testing system comprises a model soil tank, a simulation testing device of a excavation system of a reduced-scale single-circle shield, a uniformly distributed load charging device and a PIV digital image processing system, wherein transparent soil is contained in the model soil tank, the model soil tank is connected with the uniformly distributed load charging device after an upper cover is removed; one end, provided with a separation plate, of the model soil tank is connected with the simulation testing device of the excavation system of the reduced-scale single-circle shield, lasers are distributed above and on the side faces of the model soil tank, a CCD camera is used for acquiring images and is connected with a computer for controlling image acquisition and analyzing the image data. The invention further discloses a method for performing observation testing by adopting the system. According to the system and the method, visual environment is realized through the transparent soil, the transparent model soil tank, and the transparent shield tunneling machine model, and by utilizing the commercial PIV digital image processing system, the flow characteristics of the muck in the soil chamber and the deformation characteristics of the soil body in front of an excavation face when the simulation testing device of the excavation system of the reduced-scale single-circle shield tunnels are directly observed and recorded.

Description

technical field [0001] The invention belongs to the field of tunnels and underground engineering, and relates to an observation and test system for the flow characteristics of muck in soil bins during the excavation process of a single-circle shield. Background technique [0002] Due to its technical and economic advantages, the earth pressure balance shield has been widely used in the shield tunneling construction of urban subways. During shield excavation, it is very important to set a reasonable soil pressure for controlling ground subsidence, increasing excavation speed, and reducing excavation cost. The flow of muck in the soil bin is an important factor affecting the pressure of the soil bin. Clarifying the flow characteristics of muck in the soil bin is the key to analyzing the pressure of the soil bin, setting the construction parameters reasonably, and ensuring the smooth excavation of the shield. [0003] Through the literature search of the prior art, it is foun...

AI Technical Summary

Problems solved by technology

However, the above-mentioned invention still does not solve the problem of the opacity of soil bin materials and soil bodies, and cannot observe the flow of muck in the bin, and cannot analyze the flow characteristics of muck

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