Ryo ASATSUMA
Numerical Analysis of the Limite Horizontal Subgrade Reaction of Piles in Weak Viscous Ground
Satoru OHTSUKA
This study intended for weak viscous ground, was to understand the behavior of the pile surrounding ground when it receives a large deformation by the earthquake.
It was conducted a series of elements and test model experiment for the purpose of obtaining the basic data for setting the horizontal subgrade reaction force of the cohesive soil and to examine the mechanism of plastic state of the ground.
Furthermore, based on the upper bound theorem rigid-plastic finite element analysis, it was simulated model experiments.
The calculation of when subjected to friction cut around the pile were carried out.
And pile the surrounding ground is I was calculated taking into account the impact of the case with a strength reduction by pile set.
I performed numerical experiments on the pile group effect.
From (1) model the experimental results, a horizontal ground reaction force became the peak horizontal ground reaction force in displacement time of about 10% of the length of the pile.
In addition, it later was a plastic behavior that does not cause nearly the strain softening and hardening.
(2) from the model pile peripheral installed the reference point, we were able to observe the wraparound of pile surrounding ground.
It was also observed to slip through deformation.
The impact range is from pile center of the length of the pile 2.5 to 3 times.
(3) Numerical experimental results it was possible to obtain the same results as the model experiments.
Then, based on these results, it was considered extreme horizontal ground reaction force acting on the pile during an earthquake.
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