Effects of inner sleeves on the inner frictional resistance of open-ended piles driven into sand

doi:10.1007/s11709-016-0335-0

Frontiers of Structural and Civil Engineering

2016, Vol. 10

Issue (4): 499-505 https://doi.org/10.1007/s11709-016-0335-0

本期目录

Effects of inner sleeves on the inner frictional resistance of open-ended piles driven into sand

Janaka J. KUMARA(

),Yoshiaki KIKUCHI¹,Takashi KURASHINA¹,Takahiro YAJIMA²

¹. Department of Civil Engineering, Tokyo University of Science, Noda 278-8510, Japan
². Maeda Corporation, Tokyo 102-8151, Japan

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Abstract：

In open-ended piles, inner friction is developed between inner pile shaft and the inner soil. Inner frictional resistance depends largely on the degree of soil plugging, which is influenced by many factors including pile diameter, relative density and end conditions of piles. In this paper, effects of inner sleeves on inner frictional resistance are discussed. The experiments were conducted on a medium-dense sandy ground using laboratory-scale piles. It was observed that the piles penetrated under partially-plugged or unplugged state. The results suggest that inner frictional resistance, Q_in increases with sleeve height, l linearly and requires 2D (D is pile outer diameter) of l to produce a large as 50% of Q_t by Q_in (Q_t is total resistance). The results also indicate that bearing capacity increases with wall thickness at the pile tip, which can be attributed to the increase in annular area. The results also indicate that soil plug height is independent of sleeve height. The results also reveal that the penetration of straight piles is closer to unplugged state than the sleeved piles. The results of incremental filling ratio and plug length ratio also indicate that the degree of soil plugging is affected by the sleeve height.

Key words： bearing capacity inner frictional resistance inner sleeve open-ended piles soil plugging

收稿日期: 2015-04-06 出版日期: 2016-11-29

Corresponding Author(s): Janaka J. KUMARA

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2016, 10(4): 499-505.
Janaka J. KUMARA,Yoshiaki KIKUCHI,Takashi KURASHINA,Takahiro YAJIMA. Effects of inner sleeves on the inner frictional resistance of open-ended piles driven into sand. Front. Struct. Civ. Eng., 2016, 10(4): 499-505.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-016-0335-0
https://academic.hep.com.cn/fsce/CN/Y2016/V10/I4/499

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