中南大学学报（自然科学版）2025，Vol.56Issue(6)：2346-2358,13.DOI:10.11817/j.issn.1672-7207.2025.06.018
考虑水泥土软化特性的劲性复合桩加固路基破坏机理与稳定性研究
Research on stability and failure characteristics of an embankment improved with SDM columns considering softening behaviors of cemented-soil
摘要
Abstract
Stiffened deep mixing(SDM)columns,as an innovative composite pile technique,are widely applied in the soft ground improvement.The SDM column-supported embankment may suffer instability and failure,and thus understanding the failure characteristics of the pile body plays a critical role in the stability calculation of embankments.Considering the softening characteristics of the cemented-soil and the plastic damage characteristics of the concrete,the SDM column-supported embankment stability was numerically analyzed through two pathways,i.e.,overloading on the pavement and reduction of subgrade strength.The failure mechanism of embankment instability was explored,the development law of the plastic zone in the pile body and the mechanical response of the pile under overload was revealed,and the bearing characteristics of the pile body during strength reduction process was clarified,determining the safety factor of embankment stability.The results indicate that under overload,the embankment undergoes typical circular sliding failure,dividing the pile body below the pavement and slope into the compression and bending zones.The outer core of the SDM column reinforces the inner core,and compared with the traditional PC pile-supported embankment,the stability safety factor of the SDM column-supported embankment can be increased by 13.7％,with the maximum horizontal displacement of each pile in the SDM column-supported embankment being only 76％-82％of that in the PC pile-supported embankment.The research findings can provide a reference for the design,engineering application,and promotion of the SDM column-supported embankment.关键词
路基/劲性复合桩/桩承路堤/水泥土软化/破坏机理/稳定性Key words
subgrade/stiffened deep mixing column/pile-supported embankment/softening behaviors of cemented-soil/failure mechanism/stability分类
建筑与水利引用本文复制引用
张超哲,刘松玉,章定文,王振,张国凯,赖丰文..考虑水泥土软化特性的劲性复合桩加固路基破坏机理与稳定性研究[J].中南大学学报（自然科学版）,2025,56(6):2346-2358,13.基金项目
国家自然科学基金资助项目(52078129,42277146,52378401,52422808) （52078129,42277146,52378401,52422808）
中国博士后科学基金面上资助项目(2024M764225) （2024M764225）
中央高校基本科研业务费资助项目(30923010308)(Projects(52078129,42277146,52378401,52422808)supported by the National Natural Science Foundation of China （30923010308）
Project(2024M764225)supported by the China Postdoctoral Science Foundation （2024M764225）
Project(30923010308)supported by the Fundamental Research Funds for the Central Universities) （30923010308）
