Complex formation underwater slurry shield mud film formation simulation device and simulation method

Abstract

The invention discloses a complex formation underwater slurry shield mud film formation simulation device comprising a soil box, a semicircular shield shell and a power loading system; the soil box and the shield shell are made from transparent material; the power loading system provides driving force for mud mixed with fluorescent powder in a mud warehouse; a excess pore water pressure monitoringhole connected with a U-type pressure gage is arranged in front of a cutter in the soil box; the soil box is also provided with a constant head simulation device for providing a constant head for thesoil box; a scale ruler parallel to the axis of the shield shell is arranged on the side wall, on which the shield shell is arranged, of the soil box; a drain hole connected with a measuring cylindervia a drain pipe is formed in the bottom of the soil box; and a drain valve is arranged on the drain pipe. By using the device, the different formation conditions, slurry proportion, grouting pressure and grouting quantity can be controlled to simulate a slurry shield grouting system, the parameters such as the mud water filter, mud thickness, excess pore water pressure of soil mass in front of the mud film and the like are measured to research and analyze the mud forming effect.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and in particular relates to a mud film formation simulation device and simulation method of underwater mud-water shield tunneling in complex formations. Background technique [0002] With the continuous development of my country's urban rail transit construction, there are more and more tunnel constructions under complex conditions, such as underwater tunnels, tunnel construction close to existing tunnels and buildings, and tunnel construction under complex geological conditions such as sand and pebbles. Slurry-water balance shield has the advantages of safe construction, small construction disturbance, and wide applicability, and is widely used in tunnel construction under complex geological conditions of high water pressure and infiltration. The core of mud-water balance shield tunnel construction is to form a dense mud film in front of the excavation face by grouting, so that the mud...

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Problems solved by technology

[0005] However, the above-mentioned patents cannot simulate the mud film formation effect of the underwater mud-water shield tunnel, and to observe the formation of the mud film, it is necessary to dig out the experimental soil layer and take out the mud film after the grouting is completed, which is troublesome and easy to damage the mud film. The formation of the mud film and the seepage path of the mud in the experimental soil layer cannot be observed in real time

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