Comparative Study on In-Line Orthogonal and Staggered Arrangements of DCM Columns: Stress Distribution, Deformation Characteristics of Two Cases
DOI:
https://doi.org/10.21467/proceedings.8.2.30Abstract
Deep Cement Mixing (DCM) method has been increasingly adopted in site formation and ground improvement projects in Hong Kong. The planar arrangement of DCM columns directly influences the bearing performance, stress distribution, and deformation characteristics of composite foundations. This paper systematically compared the differences between in-line (square/orthogonal) and staggered (triangular/quincunx) arrangements of DCM columns. The three-dimensional (3D) finite element method is adopted to analyse the mechanical response of two cases in Hong Kong. One case is a deep trench excavation in column-type DCM treated ground. Another case is a building sitting on DCM improved ground. By comparing the stress distribution and deformation characteristic of the in-line orthogonal and staggered DCM column layout, the engineering benefits of staggered DCM column arrangement in excavation and foundation projects are provided.
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