Cantilevered Inclined LongShortPiles Support Performance&nbsp;Model
for Sandy Soil Strata

YUAN Congcong; YUAN Zongyi; ZHAN Gangyi; XU Changjie; SHI Yufeng; GONG Honghua

doi:10.3973/j.issn.2096-4498.2022.04.015

Tunnel Construction >

2022 , Vol. 42 >Issue 4: 664 - 671

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.04.015

Cantilevered Inclined LongShortPiles Support Performance Model for Sandy Soil Strata

YUAN Congcong ,
YUAN Zongyi ,
ZHAN Gangyi ,
XU Changjie ,
SHI Yufeng ,
GONG Honghua

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(1.Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,Jiangxi,China;2.Jiangxi Underground Space Technology Development Engineering Research Center,East China Jiaotong University,Nanchang 330013,Jiangxi,China;3.CCCC FHDI Engineering Co.,Ltd.,Guangzhou 510230,Guangdong,China;4.China Railway Shanghai Design Institute Group Co.,Ltd.,Shanghai 200070,China;5.Jiangxi Local Railway-Development Co.,Ltd.,Nanchang 330001,Jiangxi,China)

Online published: 2022-05-01

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Abstract

Inclined piles can improve the horizontal bearing capacity of row piles. The longshortpiles can reduce the pile length of part of the supporting pile according to the pile moment distribution and to completely use the supporting pile bearing capacity. The combination of these two forms the inclined longshortpiles. To study the deformation force characteristics of inclined longshort combined piles as foundation pit retaining structures, the influence of inclined long pile inclination angle and long and short piles ratio are analyzed using conventional indoor sand model test. The test results show the following: (1) Compared with long piles with equivalent lengths, the inclined longshortpiles can effectively control the deformation and pile moment when the total pile length is reduced. (2) When the inclined pile inclination angle ranges from 0° to 20°, the support effect increases with an increase in inclination angle. (3) The pile moment of the inclined longshortpiles decreases with an increase in inclination angle, and the decrease of moment below the excavation surface is much greater. (4) The bending moment of longshortpiles above the excavation surface is similar, and that below the excavation surface of long piles is considerably larger than that of short piles. (5) The higher the proportion of short piles, the weaker is the support effect and the larger is the bending moment of piles.

Key words： inclined longshortpiles; model test; sandy soil strata; foundation pit excavation; retaining structure displacement; pile bending moment

Cite this article

YUAN Congcong , YUAN Zongyi , ZHAN Gangyi , XU Changjie , SHI Yufeng , GONG Honghua .

Cantilevered Inclined LongShortPiles Support Performance Model for Sandy Soil Strata

[J]. Tunnel Construction, 2022 , 42(4) : 664 -671 . DOI: 10.3973/j.issn.2096-4498.2022.04.015

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