Influenced by the geological properties of soft soil,the effective support of deep foundation pit in this kind of environment is an important measure to control its displacement development.In this regard,this paper studies the construction technology of deep foundation pit support adjacent to existing buildings in soft soil area.Combined with the geological conditions of the deep foundation pit construction area,the drilling and shotcreting synchronous construction is carried out at the pile foundation positioning point by drilling rotary jet mixing.In the construction stage of the supporting structure,the pressure drilling hole forming method is used for construction.The test results show that the horizontal displacement and longitudinal displacement around the deep foundation pit are stable within 20 mm and 21 mm respectively within 120 days,showing high stability.
soft soil areaadjacent to existing buildingdeep foundation pit support constructiondrilling rotary jet mixingsupporting pile foundationpressure drilling hole forming method
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