半刚性水泥搅拌桩软基加固特性及回填分层施工影响研究  

Analysis on characteristics of semi-rigid cement soil mixing pile and effect of graded construction for soft foundation

作　　者：邹鹏旭 陈良志[1] 彭志豪[1] ZOU Peng-xu;CHEN Liang-zhi;PENG Zhi-hao(CCCC FHDI Engineering Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司,广州510230

出　　处：《水道港口》2019年第1期99-105,共7页Journal of Waterway and Harbor

摘　　要：水泥搅拌桩加固处理的海堤软基沉降计算目前多以复合地基法为主,为研究半刚性水泥搅拌桩软基加固特性,探讨上部堤心石分层回填施工对其影响,采用PLAXIS 3D岩土有限元软件对海堤进行整体三维有限元数值模拟,其中水泥搅拌桩采用实体桩建模,从而避免了复合地基法的计算假定,更真实的反映软土地基加固的变形性质。结果表明:适当减小分层层数对地表沉降以及水泥搅拌桩的内力及变形影响很小,从而可以缩短工期、降低施工成本。研究结果为类似工程设计与施工提供参考。The settlement calculation of soft foundation under seawall reinforced by cement mixing piles is mainly based on the composite foundation calculation method.PLAXIS 3D software with the solid pile method was used to analyze the characteristics of the semi-rigid cement soil mixing piles and to discuss the influence of the number of construction layers in longitudinal direction of seawall structure,thus assumption of the composite foundation calculation method can be avoided and the properties of soft foundation can be truly reflected.The results show that the construction layers have little influence on the surface settlement of seawall and the stress and deformation of cement mixing piles,which can reduce the construction cost and period and provide references for similar engineering design work.

关 键 词：半刚性桩软基加固 分层施工 有限元数值模拟 水泥搅拌桩 

分 类 号：U652[交通运输工程—港口、海岸及近海工程]