Grouting reinforcement method for deformation control of subway subsurface tunnel underneath-passing operation subway interval

Abstract

Disclosed is a grouting reinforcement method for deformation control of a subway subsurface tunnel underneath-passing operation subway interval. The grouting reinforcement method comprises the steps that pre-grouting is conducted on a tunnel base through an existing line interval ballast bed structure, and cement-EAA epoxy composite grout is injected through an advancing type segmented drilling grouting technology; a vertical sleeve valve pipe pre-grouting process is adopted to conduct grouting reinforcement on a certain plane and depth range stratum on the outer side of the existing line interval from the ground; in the process that a subsurface tunnel penetrates through an existing operation subway interval, an informatization construction means is adopted, and a sleeve valve pipe tracking grouting technology is adopted for a certain plane and depth range stratum between two lines of the existing line interval from the ground; and a WSS horizontal tracking grouting technology is adopted for a certain plane and depth range stratum between an existing line interval and the subsurface tunnel in the horizontal direction (adjacent subway foundation pits), active control measures are taken for deformation control, and the method has very important reference value and practical significance for engineering construction of the similar subway tunnels underneath passing through the existing line in a close range.

Description

technical field [0001] The invention relates to the technical field of tunnel close-up construction, and relates to a grouting reinforcement method for deformation control of a submerged underground excavation tunnel passing under an operating subway section, and in particular to a grouting reinforcement method suitable for deformation control of a large-section underground excavating tunnel passing under an operating subway section. Pulp reinforcement method. Background technique [0002] Due to the special environment of urban tunnel construction, it is often encountered that the tunnel passes through existing buildings (structures). In order to reduce the impact of tunnel construction on the safety of ground structures and adjacent underground structures, the usual measures are mainly to strengthen Advance support, selection of appropriate excavation methods, increase of pre-reinforcement measures for excavated tunnels, enhancement of initial support strength of excavated...

AI Technical Summary

Problems solved by technology

[0002] Due to the special environment of urban tunnel construction, it is often encountered that the tunnel passes through existing buildings (structures). In order to reduce the impact of tunnel construction on the safety of ground structures and adjacent underground structures, the usual measures are mainly to strengthen Advance support, selection of appropriate excavation methods, increase of pre-reinforcement measures for excavated tunnels, enhancement of initial support strength of excavated tunnels, acceleration of initial support ring formation and initial support back grouting process, etc., are all carried out around the new tunnel itself, meaning It is a passive protection scheme to suppress the displacement changes of surrounding buildings and structures by controlling their own settlement and deformation. To stabilize the deformation and development of new tunnels, and then delay the deformation trend of surrounding buildings and structures. This process is complicated, long-lasting and uncontrollable, and may seriously affect the safety of surrounding buildings and structures.

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