Abstract

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Title:: Research on Mechanical and Deformation Properties of Micro-pile with Predrilled Oversize Hole Based on Shaking Table Test

Author(s):: ZHUANG Yi-zhou; CHENG Jun-feng; LI Zeng-feng; WANG Sheng-zhi; College of Civil Engineering, Fuzhou University

Keywords:: new semi-integral abutment bridge; micro-pile with predrilled oversize hole; predrilled hole parameter; peak bending moment; lateral displacement

Abstract:: In order to study the mechanical and deformation properties of micro-pile with predrilled oversize hole under earthquake, the micro-piles with 4 kinds of parameters including with or without predrilled oversize hole, different diameters,different depths of predrilled oversize, different materials of predrilled oversize were conducted by shaking table test. The bending moment and lateral displacement of micro-pile were obtained by computation.The corresponding depth positions and the distribution laws of bending moment and peak lateral displacement under different parameters of micro-pile were obtained by analyzing. The results show that the maximum peak displacement of micro-pile with predrilled oversize hole is found at surface of soil, and is decreased along the depth of pile, the peak bending moment and peak displacement of micro-pile will increase after predrilling oversize hole. With the increase of depth of pile with predrilled oversize hole, the peak displacement and peak bending moment of pile are increased, and the maximum peak moment point has the trend of moving downward. The conclusions from above analyzing can offer a foundation for the research on the mechanical and deformation properties under earthquake, and provide references for the designing and application of micropile with predrilled oversize hole in new semi-integral abutment jointless bridges.