Vol14 No.3: 581-594
【Title】Observed deformation characteristics of a deep excavation for the spring area in Jinan, China
【Author】ZHANGDing-wen1; SHUJi-cheng1*; SUNJian-ping2
【Addresses】1 Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing 210096, China; 2 School of Civil Engineering, ShangdongJianzhu University, Jinan 250014, China
【Citation】Zhang DW, Shu JC, Sun JP (2017) Observed deformation characteristics of a deep excavation for the spring area in Jinan, China. Journal of Mountain Science 14(3). DOI: 10.1007/s11629-016-4038-8
【Abstract】The observed deflections and internal forces of pile-anchor retaining excavation were studied in spring area in Jinan city of China. Based on field measured data, the ground surface settlement, deflection of retaining piles and wall, internal force analysis of concrete piles, axial anchoring forces, groundwater table, and the deformation of surround building and pipelines wereinvestigated. The results indicates that the combining application of concrete piles, jet grouting columns and anchors support systemcan effectively control excavation-induced surface ground settlements.The field maximum lateral wall deflections are between 0.02% and 0.19% of the excavation depth due to the competitive site conditions.The bending moment-depth relationship curve is S-type. Groundwater leakage results in the sharp dropingroundwater level,which is part of the reasons for the adjacent building settlement.The axial anchoring forces of the upper layer of anchors increase gradually during the excavation, but those of the lower layer of anchors slightly reduced firstly and then tend to be stable during the excavation procedure. In comparison with the histories of excavation cases, the small lateral wall deflection in this study results from the favorable site condition and the relative rigidity of the retaining structure system.
【Keywords】Spring area; Excavation; Pile anchor system; Ground settlement; Horizontal displacement