Abstract
Experimental model was done for pile model of L / D = 25 installed into a laminar shear box contains different saturation soil densities (loose and dense sand) to evaluate the variation of pore water pressure before and after apply seismic loading. Two pore water pressure transducers placed at position near the middle and bottom of pile model to evaluate the pore water pressure during pullout tests. Seismic loading applied by uniaxial shaking table device, while the pullout tests were conducted through pullout device. The results of changing pore water pressure showed that the variation of pore water pressure near the bottom of pile is more than variation near the middle of pile in all tests. The variation of pore water pressure after apply seismic loading is more than the variation before apply seismic loading near the middle of pile and near the bottom of pile and in loose and dense sand. Variation of pore water pressure after apply seismic loading and uplift force is less than the variation after apply seismic loading in loose sand at middle and bottom of pile.
Highlights
Structures foundation like retaining walls, transmission towers, tall chimneys, off shore structures are subjected to tension loads (Shelke and Patra, 2009), (Deshmukh, et al, 2010) & (Vanitha, et al, 2007)
These values changed during pullout test, at (MOP) it increased to 2.44 kPa dropped to 1.71 kPa and after the test finished it reached to near value at start of the test, while in (BOP) the PWP decreased from 4.55 kPa to 2.57 kPa and reached to start value
The results indicate that during pull out test of pile in loose sand the PWP decreased at middle of pile (MOP) and bottom of pile (BOP) and the changing at the BOP was more than at MOP and at BOP occurred first
Summary
Structures foundation like retaining walls, transmission towers, tall chimneys, off shore structures are subjected to tension loads (Shelke and Patra, 2009), (Deshmukh, et al, 2010) & (Vanitha, et al, 2007). Like these structures, the overturning moments are move out to the piles of the structure and piles becomes under two types of loads compression in some piles and tension on others. Few study like (O’Neill,, et al, 1990) have been performed under the influence of seismic This experimental research devoted to determining the variation of pore water pressure during pile pullout tests before and after apply seismic loading
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