饱和松软土刚性桩复合地基失稳变形特性研究  

Study on the Instability and Deformation Characteristics of Rigid Pile Composite Foundation in Saturated Mollisol

作　　者：任华锋[1] REN Huafeng(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2022年第6期1-5,共5页High Speed Railway Technology

摘　　要：刚性桩复合地基常用于深厚软土地区,其失稳变形特性是饱和松软土复合地基设计考虑的关键因素之一。本文通过室内离心模型试验和数值仿真,分析了柔性荷载作用下刚性桩复合地基的沉降、变形规律及基桩稳定性,试验结果表明:当桩间距由3m增大到6m时,路基中心沉降及坡脚外侧隆起量均超过15 mm,地基变形系数达到0.8,外侧刚性桩均出现断裂现象,复合地基发生失稳,建议桩间距控制在4m以内。Rigid pile composite foundation is often used in deep soft soil areas,and its instability and deformation characteristics are one of the key factors in the design of composite foundations in saturated mollisol. This paper analyzes the settlement,the law of deformation,and pile stability of rigid pile composite foundations under flexible load through an indoor centrifugal model test and numerical simulation. The test results show that:when the pile spacing is increased from 3 m to 6 m,the settlement of the subgrade center and the uplift outside the slope toe exceed 15 mm,the deformation coefficient of the foundation reaches 0.8,with the outer rigid piles broken,and the composite foundation is unstable.It is recommended that the pile spacing be controlled within 4 m.

关 键 词：饱和松软土 刚性桩复合地基 离心模型试验 数值仿真 失稳变形 

分 类 号：U461.1[机械工程—车辆工程]