Soil body improvement method of rectangular shield construction

Abstract

The invention relates to a soil body improvement method of rectangular shield construction. The soil body improvement method comprises the following steps of arranging an improved injection hole in each cutterhead spoke of a rectangular shield; carrying out region division on a soil cabin in the rectangular shield to divide the soil cabin into a left region, a right region and an upper region; in the rectangular shield construction, carrying out soil body improvement on foam injected from the improved injection hole; carrying out soil body improvement on bentonite slurry injected from the left region and the right region; carrying out soil body improvement on foam which is continuously injected from the upper region of the soil cabin. The invention provides the applicable soil body improvement method aiming at the rectangular shield construction so that full-section improvement of a cutterhead and the soil body is realized; uniform soil properties and balanced soil pressure in each region are ensured, and the influences on the shield construction by the soil pressure are reduced.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a soil improvement method for rectangular shield construction. Background technique [0002] The earth pressure balance method is used for tunnel construction, and the excavated soil is used as a stable medium to support the excavation surface during construction. The medium should have good plasticity, certain cohesion, small internal friction angle and permeability coefficient, etc. . The existing practice is to add improvement additives to improve the soil during the excavation process. The improvement additives are generally foam and bentonite mud. Through the injection of a certain proportion of foam and bentonite mud, the cut soil is improved to ensure the excavation. Face stability and tunneling efficiency. [0003] However, the existing soil improvement methods are all aimed at the construction of circular shields. For the construction of rectangular shields, the soil ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a soil improvement method for rectangular shield construction, which solves the problem that the existing soil improvement method cannot adapt to the large rectangular excavation surface and the flat bottom of the soil bin is prone to consolidation and mud cakes, which will affect the stability of the excavation surface and aggravate the disturbance of the formation, etc.

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