Engineering construction class

Characteristics of foundation pit engineering

1) The foundation pit support system is a temporary structure with small safety reserve and high risk. Monitoring should be carried out in the process of foundation pit construction and emergency measures should be taken. In case of danger during construction, timely rescue is needed.

2) Foundation pit engineering has a strong regional character. Foundations with different engineering geological and hydrogeological conditions, such as soft soil foundation and loess foundation, are very different in foundation pit engineering. There are also differences in different areas of the same city. The design and construction of supporting system and earthwork excavation of foundation pit engineering should be adapted to local conditions, and foreign experience can be used for reference, but it cannot be simply applied.

3) Foundation pit engineering has a strong personality. The design and construction of supporting system and earthwork excavation of foundation pit engineering are not only related to engineering geology and hydrogeological conditions, but also related to the location of adjacent buildings and underground pipelines, the ability and importance of resisting deformation, and the surrounding site conditions. Sometimes protecting the safety of adjacent buildings and municipal facilities is the key to the design and construction of foundation pit engineering. This determines that foundation pit engineering has a strong personality. Therefore, it is difficult to classify the foundation pit engineering, and it is also difficult to stipulate a unified standard for the allowable deformation of the supporting structure.

4) Foundation pit engineering is comprehensive. Foundation pit engineering needs not only geotechnical engineering knowledge, but also structural engineering knowledge, and needs the integration of soil mechanics theory, testing technology, calculation technology, construction machinery and construction technology.

5) Foundation pit engineering has a strong space-time effect. The depth and plane shape of foundation pit have great influence on the stability and deformation of foundation pit supporting system. In the design of foundation pit supporting system, we should pay attention to