Numerical investigation of the settlement behavior of hybrid system of floating stone columns and granular mattress in soft clay soil

International Journal of Geo-Engineering

Original Research

Ayman Altahrany¹  Fayrouz Yasser¹  Mahmoud Elmeligy¹ 

[1] Structural Engineering Department, Mansoura University, Mansoura, Egypt;

关键词: Stone columns;    Granular mattress;    Soil improvement;    Soft clay;    Finite element analysis;    PLAXIS 3D;   

DOI  :  10.1186/s40703-022-00177-4

 received in 2022-03-02, accepted in 2022-11-12,  发布年份 2022

来源: Springer

【 摘 要 】

The composite system of stone columns reinforced soil overlaid by granular mattress (GM) has been given more attention as a hybrid improvement technique. This work presents 3D finite element analyses using PLAXIS 3D software for a composite system of floating stone columns group constructed in a deep soft clay deposit in Port-Said in Egypt. The limited area of loading was investigated in conjunction with the system key parameters, i.e., length, diameter, and the GM main properties. Results validated the effectiveness of the GM in settlement reduction and system behavior enhancement. The GM thickness results in considerable settlement reduction up to value of 1.5d where d is the stone column diameter. The thickness increase can be an economical substitution instead of increasing stone column length where a new factor named “Mattress improvement factor: Ƞgm” is defined to represent the occurring improvement due to GM existence. Results also show notable reduction of settlement with increasing the length to a limiting value of L = 1.8B where B is the footing width.

【 授权许可】

CC BY   
© The Author(s) 2022

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