Method for controlling deformation of tunnel outside foundation pit based on liquid slurry blocking wall

Abstract

The invention discloses a method for controlling deformation of a tunnel outside a foundation pit based on a liquid slurry blocking wall. The liquid slurry blocking wall is adopted to replace a traditional rigid blocking system, the traction effect of an active area outside the pit is effectively controlled, and the effect of effectively controlling deformation of the tunnel outside the foundation pit is achieved by releasing deformation energy of a displacement field of the active area outside the pit through shear deformation of liquid; and after construction of the foundation pit is completed, the liquid slurry blocking wall is subjected to landfill treatment, so that the field is restored to the original shape. According to the brand-new liquid slurry blocking wall provided by the method, a soil body of the active area outside the pit is divided into a traction effect influence area according to the soil body characteristics of the field, the liquid slurry blocking wall with slurry as a main body is arranged in the traction effect influence area, the field deformation energy is released through liquid shear deformation while the main stress sigma 3 in the horizontal direction is effectively blocked from being propagated in the field, and horizontal deformation propagation is effectively blocked. By setting reasonable design parameters, the deformation control effect of the liquid slurry blocking wall is effectively improved, and meanwhile the construction cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of foundation engineering and tunnel engineering, and in particular relates to an engineering method for protecting existing urban subway tunnels and controlling their deformation and development. Background technique [0002] The construction of urban rail transit has effectively promoted the development and utilization of various underground spaces around, and a large number of deep and large foundation pit engineering projects continue to emerge. At the same time, the excavation projects around the urban rail transit are moving in the direction of large-depth excavation. When deep and large foundation pits are constructed adjacent to existing subway tunnels, controlling the tunnel deformation caused by foundation pit construction is a major problem in foundation pit engineering in soft soil. [0003] During the excavation of the foundation pit, the enclosure structure will produce a horizontal displacement in the ...

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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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