Support structure and precipitation design of deep foundation pit in over-consolidated stratum
WANG Dunxian1, WANG Meng2
1. General Office, Xuzhou Rail Transit Corporation, Xuzhou 221000, Jiangsu, China; 2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China
Abstract The dissertation carried out researches on parameters of internal force, displacement of pile top and stability against overturning of deep excavation in Xuzhou Rail Transit Line 2, by means of FRWS software, to determine the support form of the base pit of the station foundation pit suitable for the over-consolidated stratum. The research focused on the settlement of the retaining structure in the precipitation construction and the impact on the surrounding surface. Through the monitoring of displacement of pile top, surface settlement and water level in the pit, the maximum horizontal deformation of the retaining structure at the standard section was 14.60 mm, and the surface settlement at the standard section was 21.00 mm. This met the specification design requirements. A joint design method was formed. The method was to insert the over-consolidated stratum to cut off the aquifer through the bite pile, and arrange the precipitation and dewatering well in the pit to control the consolidation settlement. It could effectively control the settlement of over-consolidated soil and provide a reference for similar projects.
WANG Dunxian,WANG Meng. Support structure and precipitation design of deep foundation pit in over-consolidated stratum[J]. Hazard Control in Tunnelling and Underground Engineering,
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