岩土工程学报2026，Vol.48Issue(z2)：23-27,5.DOI:10.11779/CJGE2026S20004
基于FDM-DEM耦合三维模型的水泥土搅拌桩复合地基变形及破坏机制研究
Deformation and failure mechanism of composite foundations with deep cement mixing columns based on 3D coupled FDM-DEM model
陈旭 1秦昕 1黄超 1汤明高 1朱星 1焦彤 1胡垚1
作者信息
- 1. 成都理工大学地质灾害防治与地质环境保护全国重点实验室,成都 610059
- 折叠
摘要
Abstract
To investigate the bearing characteristics and macro-meso failure mechanisms of composite foundations with end-bearing and floating deep cement mixing(DCM)columns,an FDM-DEM model is established for a comparative study.Results indicate that the ultimate bearing capacity of the end-bearing composite foundation is 18.7%higher than that of the floating type.Regarding excess pore water pressure evolution,zones of high excess pore water pressure in end-bearing foundations are concentrated in the shallow reinforced area and dissipate rapidly under the control of the top drainage boundary.Conversely,floating foundations,influenced by deep load diffusion,exhibit significant accumulation and markedly delayed dissipation of pore pressure in the underlying soft soil.Meso-scale force chain analysis reveals distinct instability mechanisms:strongly constrained by the rigid bearing layer at the pile tip,end-bearing piles suffer from buckling and breakage of strong force chains in the upper shaft due to stress concentration,leading to macroscopic structural failure at the pile tip.In contrast,force chains in floating piles remain geometrically continuous and intact,with instability primarily stemming from insufficient tip resistance inducing coordinated pile-soil settlement and overall punching failure.关键词
FDM-DEM耦合/水泥土搅拌桩/复合地基/变形/破坏机制Key words
FDM-DEM/deep cement mixing(DCM)columns/composite foundation/deformation characteristics/failure mechanism分类
建筑与水利引用本文复制引用
陈旭,秦昕,黄超,汤明高,朱星,焦彤,胡垚..基于FDM-DEM耦合三维模型的水泥土搅拌桩复合地基变形及破坏机制研究[J].岩土工程学报,2026,48(z2):23-27,5.
