An electrophoresis system and method for improving the strength and air-tightness of shield engineering mud film

Abstract

The invention discloses an electrophoresis system and method for improving the strength and air-tightness of a mud film in a shield tunneling project. The system includes a mud conveying system, mud, a pressure chamber, a cathode electric plate, an anode electric plate, and a shield cutterhead; the mud It is composed of coarse-grained materials, bentonite particles and water in proportion, and penetrates into the formation from the pressure chamber under high pressure to form a mud film on the excavation surface; the cathode electric plate is arranged on the surface of the shield cutterhead; the anode The electric plates are evenly arranged at intervals of 0.8m to 1.2m on both sides of the ground where the shield tunnels through, and are 0.3m to 1m away from the shield machine. The negatively charged bentonite particles in the mud migrate to the anode plate under the action of electrophoresis and accumulate on the surface of the mud film, which increases the thickness and density of the mud film and improves the air-tightness of the mud film. The method is simple to operate and easy to implement, and can greatly improve the strength of the mud film of the mud-water shield, so that the excavation surface of the mud-water shield is more stable during the construction process of the mud-water shield, thereby improving construction safety and efficiency.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to an electrophoresis system and method for improving the strength and air-tightness of a shield engineering mud film. Background technique [0002] With the large-scale construction of urban subways, highway tunnels, railway tunnels and diversion tunnels in my country, mud-water shields have been widely used in engineering due to their safety and reliability, high construction efficiency, and high excavation accuracy. Slurry shield is to balance the mud pressure of the pressure chamber with the earth pressure and water pressure on the excavation surface through the mud film. Therefore, the requirements for the strength of the mud film and the air-tightness are getting higher and higher in engineering. Therefore, there is a need for a system and method for improving the strength and air-tightness of the mud film in shield tunneling. [0003] At prese...

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Problems solved by technology

[0004] To sum up, the existing methods have the following shortcomings: ① There is a single way to improve the strength of the mud film, most of which are to improve the properties of the mud, and these methods are all aimed at specific engineering formations and do not have universal applicability; ② For electrophoresis The system and method for forming high-strength mud film have not yet appeared

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