A method for controlling deformation of tunnel outside foundation pit based on liquid grout wall

Abstract

The invention discloses a method for controlling the deformation of a tunnel outside a foundation pit based on a liquid barrier grout wall. The liquid barrier grout wall is used to replace the traditional rigid barrier system, so as to effectively control the "pull effect" of the active zone outside the pit, and release it through the shear deformation of the liquid. The deformation energy of the displacement field in the active area outside the pit can effectively control the deformation of the tunnel outside the foundation pit; after the foundation pit construction is completed, the liquid barrier grout wall is buried to restore the site to its original state. The new liquid barrier grout wall proposed by the method of the present invention divides the soil in the active area outside the pit into the "pulling effect" affected area according to the soil properties of the site, and sets a section of the liquid barrier grout wall with the mud as the main body inside it to effectively block the soil. Horizontal principal stress σ 3 At the same time of field propagation, liquid shear deformation is used to release field deformation energy, effectively blocking horizontal deformation propagation. By setting reasonable design parameters, the deformation control effect of the liquid barrier grout wall can be effectively improved, and the project cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of basic engineering and tunnel engineering, and particularly relates to an engineering method for protecting an existing subway tunnel in a city and controlling its deformation and development. Background technique [0002] The construction of urban rail transit has effectively driven the development and utilization of various surrounding underground spaces, and a large number of deep and large foundation pit engineering projects have emerged. At the same time, the foundation pit project around the urban rail transit is developing in the direction of large-depth excavation. When the construction of deep and large foundation pits is carried out adjacent to the existing subway tunnels, controlling the tunnel deformation caused by the construction of the foundation pits is a major problem in the construction of foundation pits in soft soils. [0003] During the excavation of the foundation pit, the enclosure structure ...

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a method for controlling the deformation of the tunnel outside the foundation pit based on the liquid-state grout-resistant wall, so as to solve the tunnel deformation control caused by the traditional engineering measures in the above-mentioned background technology for excavation and unloading of the foundation pit underperforming problems

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