Settlement Calculation Method for Composite Foundations Reinforced with Geo-Encased Stone Columns

Authors

LONG Jun, Hunan Yanhu Construction Engineering Co ., Ltd., Yueyang , Hunan 414002 , ChinaFollow
TAN Jingpeng, College of Civil Engineering , Hunan University , Changsha , Hunan 410082 , ChinaFollow

Corresponding Author

谭景鹏，男，博士研究生.E-mail：TJp130@hnu.edu.cn

Abstract

Geo-encased stone columns (GESCs ),known for their cost-effectiveness and simple construction,are widely employed in the reinforcement of soft soil foundations in practical engineering,and the analysis of their settlement serves as a crucial foundation for the design process.However,existing research mainly focuses on experimental and numerical methods,with relatively limited progress in theoretical calculations.Based on the load transfer mechanism of GESC-reinforced composite foundations and the bulging deformation of the pile body within a certain depth of the pile top under vertical loading,the reinforced zone was divided into a bulging section and a non-bulging section,and the total settlement of the pile was regarded as the sum of the compression in these two sections.A settlement calculation formula for the GESC-reinforced composite foundation was derived with consideration of the deformation compatibility between the pile,the geosynthetic encasement,and the soil.To verify the feasibility of the proposed method,a practical engineering case was analyzed using the formula.On this basis,parameter analysis was conducted.The results show that the load –settlement curve obtained from the theoretical calculation closely matches that from the field test,confirming the feasibility of the proposed method.The settlement of the GESC-reinforced composite foundation decreases with the increase in encasement strength,encasement depth,soil cohesion around the pile,and area replacement ratio,but it increases with the increase in pile-soil stress ratio.Moreover,there exists an optimal encasement depth;when the encasement depth exceeds the optimal value,increasing the encasement length has little effect on reducing the settlement of the composite foundation.

Publication Date

8-15-2025

DOI

10.14048/j.issn.1671-2579.2025.04.001

First Page

1

Last Page

7

Submission Date

August 2025

Recommended Citation

Jun, LONG and Jingpeng, TAN (2025) "Settlement Calculation Method for Composite Foundations Reinforced with Geo-Encased Stone Columns," Journal of China & Foreign Highway: Vol. 45: Iss. 4, Article 1.
DOI: 10.14048/j.issn.1671-2579.2025.04.001
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss4/1

Reference

[1]闵建刚,蔡港旗.碎石桩复合地基路堤滑移原因及处治效果分析 [J].中外公路,2021,41(6):31-36.MIN Jiangang,CAI Gangqi.Analysis on the cause and treatment effect of embankment slip of gravel pile composite foundation [J].Journal of China & Foreign Highway,2021,41(6):31-36.
[2]范留军,路晓明,苗鹏.软土区碎石桩鼓胀变形正交数值试验影响因素分析 [J].中外公路,2023,43(1):25-30.FAN Liujun,LU Xiaoming,MIAO Peng.Analysis on influence factors of swelling deformation of gravel pile in soft soil area based on orthogonal numerical test [J].Journal of China & Foreign Highway,2023,43(1):25-30.
[3]VAN IMPE W F.Soil improvement techniques and their evolution [M].Netherlands:AA Balkema,1989.
[4]YOO C,LEE D.Performance of geogrid-encased stone columns in soft ground:Full-scale load tests [J].Geosynthetics International,2012,19(6):480-490.
[5]余晓晓,徐超,李昊煜,等.土工合成材料加筋土柔性桥台施工关键技术 [J].中外公路,2025,45(1):153-158.YU Xiaoxiao,XU Chao,LI Haoyu,et al.Key construction techniques for geosynthetics-reinforced soil flexible abutments [J].Journal of China & Foreign Highway,2025,45(1):153-158.
[6]赵明华,顾美湘,张玲,等.竖向土工加筋体对碎石桩承载变形影响的模型试验研究 [J].岩土工程学报,2014,36(9):1587 -1593.ZHAO Minghua,GU Meixiang,ZHANG Ling,et al.Model tests on influence of vertical geosynthetic-encasement on performance of stone columns [J].Chinese Journal of Geotechnical Engineering,2014,36(9):1587 -1593.
[7]张玲,徐泽宇,赵明华,等.基于 DEM-FDM 耦合的筋箍碎石 桩 承 载 变 形 特 性 研 究 [J].铁 道 学 报,2022,44(11):95-104.ZHANG Ling,XU Zeyu,ZHAO Minghua,et al.Study on load-deformation characteristics of geosynthetic-encased stone column based on DEM-FDM coupling method [J].Journal of the China Railway Society,2022,44(11):95-104.
[8]张玲,张旭波,徐泽宇,等.基于辛体系的筋箍碎石桩受力变形分析 [J].岩土工程学报,2020,42(11):2040 -2049.ZHANG Ling,ZHANG Xubo,XU Zeyu,et al.Stress and deformation analysis of geosynthetic-encased stone columns based on symplectic system [J].Chinese Journal of Geotechnical Engineering,2020,42(11):2040 -2049.
[9]赵明华,何玮茜,衡帅,等.基于圆孔扩张理论的筋箍碎石桩承载力计算方法研究 [J].岩土工程学报,2017,39(10):1785 -1792.ZHAO Minghua,HE Weixi,HENG Shuai,et al.Calculation method of geogrid-encased stone columns ’ bearing capacity based on cavity expansion theory [J].Chinese Journal of Geotechnical Engineering,2017,39(10):1785 -1792.
[10]RAITHEL M,KEMPFERT H G.Calculation models for dam foundations with geosynthetic coated sand columns[C]//Melbourne：Geotechnical and Geological Engineering,2000:347-352.
[11]曹文贵,王江营,罗忠涛,等.考虑桩 -土滑移的柔性基础下复合地基沉降分析方法 [J].中国公路学报,2012,25(6):9-16.CAO Wengui,WANG Jiangying,LUO Zhongtao,et al.Settlement calculation method for composite ground considering pile-soil slip under flexible foundation [J].China Journal of Highway and Transport,2012,25(6):9-16.
[12]曹文贵,杨泽华.柔性基础下碎石桩加筋复合地基沉降分析方法 [J].岩土工程学报,2012,34(11):1997 -2004.CAO Wengui,YANG Zehua.Method for analyzing settlement of reinforced-gravel-pile composite ground under flexible foundation [J].Chinese Journal of Geotechnical Engineering,2012,34(11):1997 -2004.
[13]曹文贵,赵聚才,贺敏,等.柔性基础下筋箍碎石桩复合地基变形机理及其沉降分析方法 [J].岩土工程学报,2014,36(5):818-826.CAO Wengui,ZHAO Jucai,HE Min,et al.Deformation mechanism and settlement analysis method of reinforced- hoop-gravel-pile composite ground under flexible foundation [J].Chinese Journal of Geotechnical Engineering,2014,36(5):818-826.
[14]KONG G Q,ZHOU Y,LIU H L.Nonlinear model analysis of radial bulging deformation of geosynthetic-encased stone columns [J].International Journal of Geomechanics,2018,18(10)::06018022.
[15]DUAN Y Y,ZHANG Y P,CHAN D,et al.Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns [J].Journal of Zhejiang University SCIENCE A,2012,13(7):506-518.
[16]ZHANG L,ZHAO M H.Deformation analysis of geotextile-encased stone columns [J].International Journal of Geomechanics,2015,15(3):04014053.
[17]王飞,闫宇,焦立冬,等.考虑软化效应的滨海软土区基桩受 力 与 变 形 特 性 分 析 [J].中 外 公 路,2024,44(2):1-8.WANG Fei,YAN Yu,JIAO Lidong,et al.Analysis of mechanical and deformation behavior of foundation piles in coastal soft soil area considering softening effect [J].Journal of China & Foreign Highway,2024,44(2):1-8.
[18]赵明华.土力学与基础工程 [M].3版.武汉:武汉理工大学出版社,2009.ZHAO Minghua.Soil mechanics and foundation engineering [M].3rd ed.Wuhan:Wuhan University of Technology Press,2009.
[19]饶为国.桩‒网复合地基原理及实践 [M].北京:中国水利水电出版社,2004.RAO Weiguo.Principle and practice of pile-net composite foundation [M].Beijing:China Water & Power Press,2004.
[20]CASTRO J,SAGASETA C.Deformation and consolidation around encased stone columns [J].Geotextiles and Geomembranes,2011,29(3):268-276.
[21]陈贺,李兴庆,李桂林,等.土工材料包裹碎石桩复合地基试验研究 [J].中外公路,2019,39(1):13-19.CHEN He,LI Xingqing,LI Guilin,et al.Experiment study on composite foundation reinforced with geosynthetic-encased stone columns [J].Journal of China & Foreign Highway,2019,39(1):13-19.