Abstract

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Title:: Field Test of Foundation Dynamic Compaction About Soft Interlayer Structure in Yellow River Flood Area

Author(s):: SONG Xiu-guang; SUN Run-sheng; DONG Hang; LIU Xi-li; WANG Ke; BO Min; SANG Xue-rui; School of Civil Engineering, Shandong University

Keywords:: dynamic compaction; soft interlayer; field test; effective reinforcement depth

Abstract:: In order to study on the effect of dynamic compaction about soft interlayer in Yellow River flood plain area in western Shandong, with 4 tamping energy, the change laws of settlement, the excess pore water pressure, the bearing capacity of foundation and the mechanical properties of soil were studied. The results show that the dissipation rate of excess pore water pressure is very fast, and the excess pore water pressure is nearly dissipated by 90% after 24 h, the effect of dynamic consolidation is remarkable, and the bearing capacity of foundation can be increased by 80%, it is more reasonable to select 1 800 kN·m compacting energy, because the physical properties of the soil are obviously improved after compaction. For the Yellow River flood area containing weak intercalated structure, the excess pore pressure can be used as the 10% of self weight stress critical value to estimate the effective consolidation depth and the effective reinforcement depth is about 7 m. Comparing with the Menard formula, under the less compact energy, the actual depth of reinforcement is closer to that; under the larger tamping energy, Menard formula can not be applied. The results of this study can apply some guidance for the foundation reinforcement in this area.