新型固化土垫层-搅拌桩复合地基动力特性分析  

Dynamic Characteristics Analysis of a New Solidified Soil Cushion-Mixing Pile Composite Foundation

作　　者：何烽 孙兴鹏 李怡玮 孙阳[2] HE Feng;SUN Xing-peng;LI Yi-wei;SUN Yang(Jiangsu Fangyang Industrial Investment Co.,Ltd.,Lianyungang 222047,China;School of Port,Coast&Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]江苏方洋实业投资有限公司,江苏连云港222047 [2]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《中国市政工程》2024年第6期126-129,167,168,共6页China Municipal Engineering

基　　金：江苏省交通运输科技项目(2022Y13)。

摘　　要：随着港区堆场机械的大型化趋势,需要寻求新的方法来应对传统面板在应用过程中产生的不均匀沉降问题。文章依托江苏省连云港市徐圩港区深厚吹填土软基处理工程,利用有限元方法搭建固化土垫层-搅拌桩复合地基2D模型,考虑循环荷载作用对固化土层厚度和固化土层弹性模量2个参数的响应进行计算,分析这种新型复合地基结构的动力特性。结果显示:在循环荷载作用过程中,桩顶沉降值随着循环加载而发生往复变化,并且每一次加载都会在上一次的基础上产生一定量的附加沉降;固化土层厚度的增加使得结构抵抗循环荷载累积沉降的能力逐渐增强;固化土层模量变化对桩顶瞬时沉降值影响较小,但对长期循环荷载作用的附加沉降影响较大。With the trend of large-scale machinery in port yard,new methods need to be sought to address the uneven settlement problem caused by traditional panels in the application process.The article is based on the deep blown soil soft foundation treatment project in Xuwei Port Area,Lianyungang,Jiangsu.A 2D model of the solidified soil cushion mixed pile composite foundation is constructed using finite element method.The response of the solidified soil layer thickness and the elastic modulus of the solidified soil layer under cyclic loading is calculated to analyze the dynamic characteristics of this new composite foundation structure.The results show that during the cyclic loading process,the settlement value of the pile top undergoes reciprocating changes with the cyclic loading,and each loading will generate a certain amount of additional settlement on the basis of the previous one.The increase in the thickness of the solidified soil layer gradually enhances the ability of the structure to resist cumulative settlement under cyclic loads.The change in modulus of the solidified soil layer has a relatively small impact on the instantaneous settlement value of the pile top,but has a significant additional settlement effect on long-term cyclic loading.

关 键 词：固化土 搅拌桩 桩顶沉降 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程]