The above theoretical calculation results are consistent with the penetration
process of pile driver and the variation trend of soil parameters. According to the
research method in this paper, the phenomena of pile collapse and pile breakage in
piling construction can also be predicted, prevented, and evaluated.
12.5.3 Conclusions
(1) In the process of impact between hydraulic hammer and pile, hydraulic
hammer transfers the strike energy to pile through the form of pile driving
impact. After the impact of hammer and pile, energy propagates in the form of
stress wave in the pile and soil, first in the pile and then to the whole soil. In
the process of energy transfer, due to the constant dissipation, the distribution
of displacement, stress, shear force and strain of pile and soil changes regularly, and the maximum value appears near the pile body or pile body. With
the gradual distance from the pile body, the value gradually decreases, and the
distribution range gradually enlarges.
(2) In the process of hydraulic hammer piling, the stress distribution of different
parts of the pile is quite different. Pile top stress is the largest and pile bottom
is the smallest. The penetrating soil part is obviously different from the
Fig. 12.42 Equivalent strain contour map
12.5 Contact Model Pile and Soil
319
process of pile driver and the variation trend of soil parameters. According to the
research method in this paper, the phenomena of pile collapse and pile breakage in
piling construction can also be predicted, prevented, and evaluated.
12.5.3 Conclusions
(1) In the process of impact between hydraulic hammer and pile, hydraulic
hammer transfers the strike energy to pile through the form of pile driving
impact. After the impact of hammer and pile, energy propagates in the form of
stress wave in the pile and soil, first in the pile and then to the whole soil. In
the process of energy transfer, due to the constant dissipation, the distribution
of displacement, stress, shear force and strain of pile and soil changes regularly, and the maximum value appears near the pile body or pile body. With
the gradual distance from the pile body, the value gradually decreases, and the
distribution range gradually enlarges.
(2) In the process of hydraulic hammer piling, the stress distribution of different
parts of the pile is quite different. Pile top stress is the largest and pile bottom
is the smallest. The penetrating soil part is obviously different from the
Fig. 12.42 Equivalent strain contour map
12.5 Contact Model Pile and Soil
319