- 期刊
Effective Length of the Soil Plug of Inner-Sleeved Open-Ended Piles in Sand
並列摘要
The bearing capacity of open-ended piles depends largely on the inner frictional contribution. The degree of the soil plugging determines the inner frictional resistance. While many factors influence the degree of soil plugging, this paper discusses the effects of inner sleeve heights on the inner frictional resistance. In this paper, the effective length of the soil plug was also studied using small-diameter sleeved piles penetrated into a medium-dense sandy ground. At first, the effects of the sleeve heights on the bearing capacity, in particular inner frictional resistance were discussed using a simple analysis method. The results suggest that a higher sleeve height increases the bearing capacity due to the increase in inner frictional resistance. A series of experiments conducted by removing the generated soil plug reveal that, not only the sleeve height affects the penetration resistance, but also the effective soil plug length is roughly two times the pile outer diameter. The experiments also indicate that the penetration resistance of the soil plug removed piles do not recover to the non-soil plug removed pile when the sleeve height is quite small. The results of the soil plug heights suggest that it is influenced by the sleeve height. The results of incremental filling ratio and plug length ratio were also discussed. The incremental filling ratio and plug length ratio of the sleeved-piles were evaluated using a new simple method to ensure that the originally defined equations for the non-sleeved piles are compatible with the sleeved piles. The results of the corrected incremental filling ratio and plug length ratio give a better indication on the soil plugging, particularly at the early penetration depth.