Abstract
Behaviors of the pile foundation due to groundwater level rising were analyzed by a series two-dimensional finite element analyses with fully coupled flow-deformation analysis. The different numerical models of single bore pile depth and diameter in Bangkok subsoil were represented with the parametric study. The pile–soil movement due to groundwater levels rising between numerical simulation and a previous experiment of the centrifuge test as the same condition are in good agreement. With rising groundwater level, the reduction of pile capacity can be evidently performed by the increase of pile settlement relative to soil surface. Moreover, the development of the plastic point captured by the finite element analysis revealed the mechanism behind the reduction of pile capacity. In this study, the evaluation of pile stability due to groundwater level rising for preliminary guidelines to protect existing structures are proposed.
Highlights
A decrease in groundwater extraction due to industrial decentralization and the restriction or prohibition of groundwater pumping has led to rising groundwater levels.It has been observed in several cities, including London (England) [1], Jeddah (SaudiArabia) [2], Naples and Milan (Italy) [3,4], Wuxi (China) [5] and Bangkok (Thailand) [6]for half of a century
The capacity, loadaccount distribution along with the pile and plaspoint of pile–soil pile–soil movement, interaction,pile which took into the simultaneous development of tic point of pile–soil interaction, which took into account the simultaneous development deformations and pore pressures in partially and fully saturated soils, with time-dependent ofchanges deformations and poreboundary pressuresconditions, in partiallyare and fully saturated soils, with time-deof the hydraulic discussed
The change of pile capacity was explained by pile–soil interaction, stress distribution along the pile and development of plastic points
Summary
A decrease in groundwater extraction due to industrial decentralization and the restriction or prohibition of groundwater pumping has led to rising groundwater levels.It has been observed in several cities, including London (England) [1], Jeddah (SaudiArabia) [2], Naples and Milan (Italy) [3,4], Wuxi (China) [5] and Bangkok (Thailand) [6]for half of a century. A decrease in groundwater extraction due to industrial decentralization and the restriction or prohibition of groundwater pumping has led to rising groundwater levels. Several studies investigated the pile–soil behavior and the capacity change of pile foundations with rising groundwater level. The results showed that the ground movements corresponded to the water level fluctuations, whereas pile movements with the working load of more than 50% of the ultimate load continuously settled with increasing pore pressures. The behavior of four driven piles in clay with increasing pore water pressure was investigated by small scale model test measured. In a series of centrifuge model experiments, Morrison and Taylor examined the effect of increasing pore water pressures on the behavior of pile foundations buried in reconstituted Speswhite kaolin clay. The results showed that the pile foundations moved less than the surrounding ground surface and reduced the ultimate capacity [13,14]
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