Space-time hierarchical control method for vertical displacement of earth pressure balance shield construction stratum

Abstract

The invention discloses a space-time hierarchical control method for vertical displacement of an earth pressure balance shield construction stratum. The space-time hierarchical control method comprises the following steps: (1) arranging measuring points of a monitoring site; (2) establishing a three-dimensional numerical model of shield construction stratum displacement, and dividing a transverse influence zone, a vertical influence layer and a longitudinal influence stage in combination with ground surface settlement and stratum layering vertical displacement data monitored on site; (3) dividing a shield gap into an excavation gap and a shield tail gap, and establishing a space-time hierarchical control system of the stratum vertical displacement influence factors; and (4) taking corresponding treatment measures according to the fact that the existing structure is located in different influence areas. Displacement data are sorted and analyzed to find out a space-time development law of vertical displacement of the stratum, a space-time grading and dividing system is provided, effective control measures can be correspondingly adopted according to the zoning position of an existing structure and different stages of earth pressure balance shield construction, stratum vertical displacement is accurately controlled, so that safe tunneling and passing of the earth pressure balance shield are achieved.

Description

technical field [0001] The invention relates to the technical field of underground shield tunneling, in particular to a method for controlling the vertical displacement of stratum vertical displacement in earth pressure balance shield tunneling in a hierarchical manner. Background technique [0002] With the increase in the intensity of urban underground space development and the vigorous development of urban rail transit, there are more and more cases of shield tunnels passing through existing pipelines, subway tunnels, pile foundations, and foundation pits under or sideways. The requirements for construction deformation control are getting higher and higher. [0003] In actual engineering construction, the following problems exist in the monitoring of the vertical displacement of the ground and the division of the affected area during the earth pressure balance shield construction: [0004] (1) At present, the research on the formation deformation law caused by earth pres...

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Problems solved by technology

[0005] (2) A lot of research has been done on the impact of earth pressure balance shield construction on adjacent buildings and structures, but most of them are based on the influence of shield tunneling on the structure of adjacent buildings, and do not fully consider the layered displacement caused by the shield itself

[0006] (3) Relevant research has been carried out on the settlement control technology of earth pressure balance shield tunneling, basically based on the research background of shield tunneling through major risk projects, and most of them first carry out ground reinforcement (or take isolation measures), and then shield tunneling again However, based on the structural characteristics and construction method characteristics of the earth pressure balance shield equipment itself, there are few studies on the settlement analysis and control methods induced by shield tunneling, and further research is needed.

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