Improved construction method of soil mass of extra-large-diameter soil pressure balancing shield on soft soil stratum

Abstract

The invention relates to an improved construction method of a soil mass of an extra-large-diameter soil pressure balancing shield on a soft soil stratum, which particularly solves the construction travelling problem of the extra-large-diameter soil pressure balancing shield. The improved construction method of the soil mass of the extra-large-diameter soil pressure balancing shield on the soft soil stratum comprises the following steps: adopting foam and bentonite slurry as additives in the tunneling construction process, injecting the additives to different positions of an excavation surfaceof a cutter, focusing on the foam and controlling the stability of soil pressure, causing bentonite slurry to play a subsidiary role and reducing the excavation strength of the soil mass, simultaneously adopting a central agitator in a soil warehouse to agitate and mix the soil mass and the additives entering into the soil warehouse and further stabilizing the excavation surface, improving the plastic fluidity, reducing the torque of the cutter and improving the tunneling efficiency.

Description

technical field [0001] The invention relates to a soil improvement construction method, especially a tunnel construction technology, which is suitable for super large diameter earth pressure balance shield machine to ensure the soil pressure balance of the soft soil layer with super large diameter earth pressure balance shield soil Improve construction methods. Background technique [0002] The earth pressure balance shield method is widely used in urban rail transit, municipal engineering, water conservancy, power and transportation energy due to its small investment scale, simple construction method, small footprint, small impact on traffic and environment, and easy control of tunneling operations. It is widely used in the field of construction, especially in the dense construction area of ​​the city and the underground tunnel project with heavy ground traffic. [0003] With the continuous development of municipal engineering construction, the requirements for earth press...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a soil improvement construction method for super-large-diameter earth pressure balance shields in soft soil strata, which can improve the excavation of super-large-diameter earth pressure balance shield machines during the excavation process due to the nature of the soil. Unstable surface and delay of advancing speed

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