The behavior of piles remains one of the largest sources of uncertainty in geotechnical engineering. Much of the uncertainty is because of a lack of understanding of the physical mechanism that controls the characteristics of deformation, strain and stress in the soil during pile installation and loading. It is hard to estimate the behavior of pile because that soil particles around the pile tip tend to be crushed when the external force exceeds their crushing strength. Another difficulty is to describe the mechanical behavior of structures interacting with soil. Simulating behaviors of sand crushing and sand-pile interactive region around pile tip provides insight understanding of the pile loading and penetration process. The numerical results will make valuable suggestions to the pile design into crushable soil in practical engineering. The deformation of soil under complex stresses in surrounding of the pile tip exhibits typical large deformation behavior. It is important to consider the geometrical nonlinearity caused by the large deformation to establish a model of the actual behavior of the structure. This study aims to implement a thorough numerical analysis on sand behavior around pile tip considering effects of large deformation and mechanical feature changes of sand crushing.……広島大学(Hiroshima University)博士(工学)Engineeringdoctora
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