Seepage Characteristics and Water Control Measures of Ultra-Large Deep Foundation Pit in Beijing Sub-Center Railway Station
The ultra-large foundation pit of the Beijing Sub-Central Comprehensive Transportation Hub Project is 32 m deep and 1.8 km long from east to west.Seepage prevention and water control are the most challenging issues during the foundation pit excavation.Based on the multi-layer aquifer conditions and the characteristics of the supporting and curtain structures,theoretical analysis is used in this paper to investigate the seepage characteristics of the ultra-large foundation pit,the evaluation of water inflow which is suitable for this type of strata is proposed and its seepage quantity is determined.Moreover,check calculations of total water inflow and anti-surge at the bottom of deep foundation pit are carried out,the water control measures that combine the dewatering and pit drainage are proposed comprehensively,which ensures the safe construction of ultra-large deep foundation pits.
Beijing Sub-Center Railway Stationultra-large deep foundation pitnonlinear seepagedewatering and pit drainagewater control measures
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