Subway foundation pit deep-buried karst cave treatment method

A treatment method and technology of karst caves, applied in infrastructure engineering, construction, etc., can solve problems such as damage to residents’ property, large economic losses, and shutdown of construction projects

CN113186924APending Publication Date: 2021-07-30CHINA RAILWAY 25TH BUREAU GRP +1

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: CHINA RAILWAY 25TH BUREAU GRP
Publication Date: 2021-07-30

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Abstract

The invention discloses a subway foundation pit deep-buried karst cave treatment method, and relates to the field of foundation pit karst cave construction. The treatment method comprises the following steps: S1, carrying out construction preparation work, specifically, mastering and knowing the karst grouting project general situation of a construction area, and carrying out construction site leveling, surveying and setting out and settlement observation pile arrangement; S2, carrying out a process test, determining a filling material and a grouting material of the karst cave and proportioning parameters of the grouting material, selecting a proper filling material, and preparing grouting slurry; S3, carrying out drilling construction, and carrying out construction edge detection on the karst cave to determine the type of the karst cave and the position of a hole; S4, carrying out grouting construction; and S5, carrying out hole sealing, specifically, cleaning a sleeve valve grouting pipe, installing a sealing device at the end of the hole, and after the grouting quality of the karst cave is checked to be qualified, carrying out hole sealing and treatment on the karst cave. According to the method, 'head falling' and 'collapse' of shield construction can be prevented, excessive ground surface settlement or collapse accidents can be prevented, post-construction settlement difference is reduced, and operation safety is met.

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Description

technical field

[0001] The invention relates to the field of foundation pit karst cave construction, in particular to a method for treating deeply buried karst caves in subway foundation pits. Background technique

[0002] Karst is the general term for various geological actions, forms and phenomena produced by soluble rocks under the erosion of water. Soluble rocks include carbonate rocks and other soluble rocks such as gypsum, salt rock, and thenardite. Karst collapse is in the karst development area with covered soil. Under certain hydrogeological conditions, the soil above the rock face encounters the caves in the soil formed by the loss and migration, and the slump deposits in the caves and the ground deformation and damage. In general, earth caves are a special type of unfavorable geological phenomenon of lava, which develops rapidly and distributes densely, and their impact on engineering is sometimes greater than that of karst caves. In recent years, karst ground c...

Claims

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