Abstract

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Title:: Vibration Pipe Sinking and Static Load Test of Low-strength Concrete Pile in Saturated Silt Soil Foundation

Author(s):: ZHANG Hong-bo; LI Chao; SONG Xiu-guang; XIE Quan-yi; LI Hong-chao; School of Civil Engineering, Shandong University

Keywords:: saturated silt soil foundation; vibration pipe sinking; low strength concrete pile; static load test; excess pore water pressure

Abstract:: In order to study the distribution and dissipation law of excess pore water pressure produced during construction, the single pile and composite foundation loadbearing characteristics in saturated silt soil foundation, vibration pipe sinking and static load test of low strength concrete pile were carried out in Binzhou City. The results show that when vibration pipe sinking, the maximum excess pore water pressure appears 23 m above the end of pile； vibration pipe sinking disturbs the soil around the pile little, the maximum excess pore water pressure is only 0.327 of that of overlying soil effective stress; the dissipation rate of excess pore water pressure can reach 65%75% after extubation for fifteen minutes; compared with the estimate value of design norms, the single pile vertical ultimate bearing capacity of vibration pile sinking is only 55%60% of the estimate value; the low strength concrete pile reinforcement effect is obvious and the bearing capacity of composite foundation can increase by 1 time compared with that of natural foundation.