Soft soil foundation pit bottom on-site solidification method and soft soil foundation pit bottom solidification structure

Abstract

The invention discloses a soft soil foundation pit bottom on-site solidification method and a soft soil foundation pit bottom solidification structure, and belongs to the technical field of soft soilfoundation strengthening. A supporting system composed of supporting piles and water stop piles is arranged on the outer side of a foundation pit excavation area, and a solidification agent is added to the surface of a soft soil layer at the bottom of a foundation pit, by means of stirring forming of the soft soil layer on the surface of the pit bottom, a surface solidification layer composed of ahard shell layer and a passive reinforcing layer can be formed at the bottom of the foundation pit, and then a stable foundation pit bottom structure is formed. According to the soft soil foundationpit bottom on-site solidification method, the construction steps are simple, operation is easy and convenient, the soft soil foundation pit bottom solidification structure with a stable structure canbe obtained, a smooth and stable foundation pit bottom face is provided for entry of subsequent construction machines in the foundation pit, the safety and reliability of related construction in the soft soil foundation pit are guaranteed, the excavation amount and the discarding amount of sludge are reduced, the economical efficiency and the environmental protection property of soft soil foundation pit construction are improved, and good popularization value and application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation reinforcement, and in particular relates to an in-situ solidification method for the soft soil foundation pit bottom and a solidification structure for the soft soil foundation pit bottom. Background technique [0002] In infrastructure construction projects, the excavation and construction of foundation pits are very common, and they are the most basic part of underground foundation engineering construction. During the foundation pit construction process, the support design and reinforcement design after excavation of the foundation pit structure are related to the safety and reliability of the entire foundation pit construction. [0003] Depending on the geological environment, there are often differences in the requirements for foundation pit construction, and this difference is particularly evident in certain specific construction environments. In the coastal area, the soft soil ...

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Problems solved by technology

Although the above methods can meet the needs of pit bottom reinforcement during the construction of soft soil foundation pits to a certain extent; however, it is often difficult to ensure the flatness and bearing capacity of the foundation with construction waste soil, and the source of gravel soil is generally difficult and costly. Relatively expensive, resulting in extremely high construction costs

Moreover, the method of excavation and replacement will inevitably lead to an increase in the excavation depth of the foundation pit, which will increase the active earth pressure on the support system, resulting in the need for corresponding strengthening of the foundation pit support system measures, which will undoubtedly increase the depth of the foundation pit construction. The difficulty of design and construction increases the cost of foundation pit construction

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