A method for judging the safety of subway broken belt after curtain grouting

Abstract

The invention relates to the field of infrastructure construction, in particular to a method for judging the safety of a subway broken zone after curtain grouting. The steps are as follows: determine the equivalent radius d of the broken zone on the plane p , to determine the calculated equivalent radius D of the contact zone p , to determine the buried depth z of the groundwater table in the intrusion contact zone 1 and the distance z from the groundwater table to the top of the subway 2 , to determine the soil weight γ above the groundwater table and the saturated weight γ of the soil below the groundwater table in the intrusion contact zone sat , determine the slump force G caused by gravity in the intrusion contact zone, and determine the undrained shear strength c of the soil in the intrusion contact zone u , to determine the thickness d of the grouting zone z , to determine the shear strength c of the grouting body c , to determine the resistance K of the grouting body, and to determine the safety factor SF that will not cause slump after grouting in the contact zone. When SF≥1.0, no slump will occur; otherwise, when SF<1.0, slump will occur collapse.

Description

technical field [0001] The invention relates to the field of infrastructure construction, in particular to a method for judging the safety of a subway broken zone after curtain grouting. Background technique [0002] During the construction of the subway, there will be a broken zone. The rock and soil in the broken zone have poor properties and high water content. Direct excavation may cause the overlying surrounding rock to collapse, endangering the safety of the project. Therefore, curtain grouting treatment before excavation is a common method, and the safety after treatment is basically based on previous construction experience. At present, there is no corresponding theoretical formula for guidance. If the construction parameters are reasonable, it can be guaranteed. Considering the safety of the surrounding rock, if it is unreasonable, landslides may still occur after disposal. In view of this, the present invention proposes a method for judging the safety of the subwa...

AI Technical Summary

Problems solved by technology

[0002] During the construction of the subway, there will be a broken zone. The rock and soil in the broken zone have poor properties and high water content. Direct excavation may cause the overlying surrounding rock to collapse, endangering the safety of the project.

Therefore, curtain grouting treatment before excavation is a common method, and the safety after treatment is basically based on previous construction experience. At present, there is no corresponding theoretical formula for guidance. If the construction parameters are reasonable, it can be guaranteed. Considering the safety of the surrounding rock, if it is unreasonable, landslides may still occur after disposal

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