Treatment method for water leakage of side walls of super-deep foundation pit envelope

Abstract

The invention provides a treatment method of side wall leakage of a retaining structure of a super-deep foundation pit. The treatment method comprises the following steps that S1, secant pile wall construction is conducted on the position, corresponding to quality defects of the foundation pit retaining structure, of the outer side of the foundation pit retaining structure, and a reinforcing bodyis formed on the outer side of the foundation pit retaining structure by a secant pile wall; and S2, rotary jet grouting reinforcement is conducted on the lower part of the secant pile wall and soil bodies on the two sides to form a reinforcing pile, the secant pile wall and the reinforcing pile form an enclosed curtain on the outer side of the foundation pit retaining structure to block a seepagepath of the foundation pit retaining structure. According to the treatment method of side wall leakage of the retaining structure of the super-deep foundation pit, the secant pile wall is adopted toform a novel retaining structure system on the outer side of the retaining structure to block flowing path of a water system outside the pit, a full-casing-tube follow-up technology is adopted, additive stress can be prevented from being generated on the retaining structure with the quality defects, and more serious risk of the foundation pit can be avoided; and an RJP technology method is adoptedto reinforce the soil bodies outside the retaining structure, a novel enclosed curtain is formed with the secant pile wall on the upper part, the water system flowing path is thoroughly cut off, andthe leakage risk in the deep part of the retaining structure is solved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a method for treating water leakage on the side wall of an ultra-deep foundation pit enclosure structure. Background technique [0002] With the acceleration of the urbanization process, urban land is becoming more and more tense, and urban construction is developing in the direction of ultra-high and ultra-deep, gradually requiring space for high-altitude and underground. During the construction of foundation pit engineering, in the complex geological environment of rich water and soft soil, the enclosure structure is subjected to lateral displacement under the action of soil pressure and water pressure outside the foundation pit; if there are quality defects in the enclosure structure of the foundation pit, water leakage is very easy to occur , especially under the action of confined water, it is very difficult to seal the enclosure structure, and improper treatme...

AI Technical Summary

Problems solved by technology

In addition, engineering construction is carried out in various high-rise urban centers. The exterior wall of the basement is very close to the red line of the project site. The available space during the construction process is very limited, especially during the excavation of the foundation pit. Clogging is more difficult

Long-term water leakage will not only affect the excavation of the foundation pit of the project, but also cause changes in the water level outside the foundation pit, especially the change in the water level of the confined water, which will cause uneven settlement of surrounding buildings, pipelines, and roads, causing immeasurable risks

In addition, improper treatment of water leakage may easily cause damage to the enclosure structure or secondary water leakage of the foundation pit, increasing the risk of the foundation pit

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