Construction Technology of Composite Support for Foundation Pit of Underground of High-Speed Railway Station
In order to ensure the safety of excavation of foundation pit adjacent to existing buildings,this paper adopts a double-row pile+rotary jet pile+grouting composite supporting structure based on practical engineering cases,aiming at the complex surrounding environment of foundation pit and the engineering characteristics of deep mixed soil filling in the excavation range,and adopts the double-pipe method to drive the occluding pile between the double rows of piles to strengthen the supporting structure.It is connected with the front row of the pile to form a water stop curtain to ensure a good water stop performance and to reinforce the mixed fill between the two rows of piles by grouting.This paper provides a detailed analysis of the structural characteristics and con-struction technology of bored piles,high-pressure jet grouting piles,and grouting technology for miscellaneous fill soil,discussing and proposing solutions to construction difficulties such as complex site conditions and complicat-ed procedures.The results indicate that the composite support structure of double-row piles,jet grouting piles,and grouting exhibits significant lateral stiffness,ensuring the safety and stability of foundation pit excavation.
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