Excavation method for subway shaft reinforcement in weak water-rich strata

Abstract

The invention discloses a reinforced excavation method for a shaft of a subway of a weak water formation. The reinforced excavation method for the shaft of the subway of the weak water formation comprises the following steps of (1) performing vertical reinforcement; (2) performing vertical local excavation; (3) performing transverse reinforcement; (4) performing transverse expanding excavation; (5) performing shaft lining; (6) monitoring deformation; (7) repeating the step (1), the step (2), the step (3), the step (4), the step (5) and the step (6) and excavating the formation to a designed elevation; and (8) bottom plate pouring: performing pouring on the bottom of the shaft after the formation is excavated to the designed elevation. Compared with the traditional excavation method, the layered and segmented excavation method has the advantages that the stability of the shaft can be guaranteed well and safety of construction is improved greatly. A water stopping effect can be high by layered and segmented reinforcement and excavation, circumstances of water burst, mud burst and the like in an excavation process are avoided, and the method is particularly suitable for excavating the shaft of the weak water formation. By the layered and segmented excavation, the stability of the shaft is improved greatly, the construction risk is greatly reduced, and the social benefit and the economic benefit are high.

Description

technical field [0001] The invention relates to a new method for excavating a shaft, in particular to a method for reinforcing and excavating a subway shaft in a weak water-rich stratum. Background technique [0002] In a considerable part of China, the geological conditions are relatively complex, which brings certain difficulties to the smooth excavation of shafts, especially in the urban environment when excavating shafts in weak water-rich strata, water gushing, mud outbursts, and large deformations are prone to occur Such as engineering disasters, ground subsidence is difficult to control, and then endangers the safety of the structure and surrounding buildings, making the construction unable to proceed smoothly. However, in the existing shaft excavation technology, few methods involve how to ensure safe and stable excavation of shafts in weak water-rich formations. Contents of the invention [0003] The purpose of the present invention is to make up for the deficien...

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Problems solved by technology

[0002] In a considerable part of China, the geological conditions are relatively complex, which brings certain difficulties to the smooth excavation of shafts, especially in the urban environment when excavating shafts in weak water-rich strata, water gushing, mud outbursts, and large deformations are prone to occur Such as engineering disasters, land subsidence is difficult to control, and then endangers the safety of the structure and surrounding buildings, making the construction unable to proceed smoothly

However, in the existing shaft excavation technology, few methods are involved in how to ensure the safe and stable excavation of shafts in weak water-rich formations.

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