Calculation for Pile-soil Stress Ratio of Pile-net Composite Foundation under Embankment

JIANG Desong,ZHANG Chengfu,ZHAO Minghua,YANG Chaowei

Abstract

This paper focused on the improvement of the current pile-supported embankment calculation model from three aspects: soil arching effect,geotextile deformation and pile-soil load transfer due to the deficiency of the embankment- reinforcement- composite pile foundation interaction model. Firstly,considering the influence of foundation stratification, buried depth and overlying load on pile-soil load transfer,the vertical deformation function of pile and soil was derived. Secondly, the empirical model of the membrane effect was introduced to analyze the influence of the lateral deformation of the embankment and the foundation on the tensile force of the geotextile. Finally, based on the soil column model, this paper analyzed the relationship between load distribution and differential settlement at the bottom of the embankment in consideration of the influence of relative displacement on the interface friction. On the basis of the above work, the improved model of embankment, geotextile, pile and inter-pile soil interaction was established on the premise of the equal relationship between pile-soil settlement and load distribution,from which the calculation method was deduced of pile-soil stress ratio of pile-net composite foundation under the embankment. The rationality of the method mentioned was validated by practicable engineering examples.

 

 

Keywords:  pile-net composite foundation,  soil arch effect,  embankments,  load transfer,  pile-soil stress ratio


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References


HE N,LOU Y. Design and calculation method for rigid pile composite foundation under embankments [J] . Chinese Journal of Geotechnical Engineering,2011,33 (5):797—802. (In Chinese)

YU J,ZHOUYT,BAO S,et al. Pile-soil stress ratio of deformable pile -supported and geosynthetics -reinforced embankments [J] . Chinese Journal of Geotechnical Engineering,2011,33 (5):705—713. (In Chinese)

CHEN R P,XU F,CHENYM,et al. Analysis of behavior of rigid pile-supported embankment in soft ground [J] . Chinese Journal of Highway and Transport,2005,18 (3):6—12. (In Chinese)

LU W H,MIAO L C. Calculation method of pile-soil stress ratio of rigid pile composite foundation [J] . Journal of Southeast University (Natural Science Edition),2013,43 (3):624—628. (In Chinese)

CAO W G,WANG J Y,LUO Z T,et al. Settlement calculation method for composite ground considering pile -soil slip under flexible foundation [J]. Chinese Journal of Highway and Transport, 2012,25 (6):9—16. (In Chinese)

CHENRP,CHENYM,HAN J,et al. A theoretical solution for pile-supported embankments on soft soils under one-dimensional compression [J]. Canadian Geotechnical Journal,2008,45 (5):611—623.

LU W H,MIAO L C,LIU C,et al. Quantitative evaluation of load effects of pile-net composite foundation based on systems analysis [J]. Chinese Journal of Geotechnical Engineering,2014,36 (12): 2291—2299. (In Chinese)

ABUSHARAR S W,ZHENG J J,CHEN B G,et al. A simplified method for analysis of a piled embankment reinforced with geosynthetics [J]. Geotextiles and Geomembranes,2009,27:39—52.

ZHUANG Y,WANGKY,LIU H L. A simplified model to analyze the reinforced piled embankments [J] . Geotextiles and Geomembranes ,2014,42:154—165.

ZHANG J,ZHENG J J,MA Q. Mechanical performance of biaxial reinforcement composite foundation under embankment loads [J] . Chinese Journal of Geotechnical Engineering,2010,32 (9):1392—1398. (In Chinese)

ZHAO M H,LIU M,ZHANG R,et al. Calculation of load sharing ratio and settlement of bidirectional reinforced composite foundation under embankment loads [J]. Chinese Journal of Geotechnical Engineering,2014,36 (12):2161—2169. (In Chinese)

ZHANG L,CHEN Z,ZHAO M H. Study on pile-soil stress ratio of composite foundation reinforced with geosynthetic encased stone columns [J]. Journal of Hunan University (Natural Sciences),2017,44 (1):136—142. (In Chinese)


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