Research And Application Of The Double Row Bored Piles In Deep Foundation Pit Supporting Project Of Wuhan

With the development of urban construction in our country,There are more and more high-rise buildings in the city.The foundation of most high-rise buildings is very deep,while underground space is used to build underground garage,warehouse,shopping malls and civil air defense facilities.Therefore,a lot of engineering problems of foundation pit excavation and support have appeared.Around the foundation pit construction,Underground pipeline is complex,anchor and soil nailing structure is not applicable.At this time,all kinds of supporting system with the new design also arises at the historic moment,take the retaining structure with double-row piles has a good effect.Double row piles with large lateral stiffness,can effectively limit the horizontal displacement of retaining structure,this kind of supporting structure can be applied in the excavation of deep foundation pit engineering.For most of the foundation pit,adopts the double row piles supporting structure enough to meet the requirements of supporting pile,and it can reduce cost,and cost savings.Structure,compared with the single row pile retaining structure with double-row piles can produce better supporting effect,the double row supporting structure can be adapted to the deeper foundation pit supporting engineering.This paper firstly introduces the research background,research status of deep excavation and research status of double row piles supporting technology,summed up the design theory of double row piles supporting structure,the design parameters for the simulation of the double row bored pile retaining structure by FLAC3 D finite difference software,according to the analysis results.Get the range of double row pile retaining structure optimal design parameters,based on the results as the theoretical support,to optimize the design of a foundation pit in Wuhan double row pile supporting scheme and analysis software for the design.Through numerical simulation,we compare simulation results and the measured value to verify its feasibility.Therefore,reasonable selection of parameters can make the double row pile retaining structure achieve better supporting effect.