不同桩距条件下CFG桩土复合加固软基的沉降变形研究  

Study onSettlement Deformation of Soft Foundation Strengthened by CFG Pile-Soil Composite Under Different Pile Distance

作　　者：南凯 毛进 熊伦 Nan Kai;Mao Jin;Xiong Lun(The 4th Engineering Co.,Ltd.of China Railway 12th Bureau Group,Xi'an 710016,Shaanxi,China;China Construction Science and Industry Corporation LTD.,Shenzhen 518000,Guangdong,China)

机构地区：[1]中铁十二局集团第四工程有限公司,陕西西安710016 [2]中建科工集团有限公司,广东深圳518000

出　　处：《绿色科技》2023年第22期181-185,192,共6页Journal of Green Science and Technology

摘　　要：CFG桩凭借其施工方便、承载力高和造价低等特点被广泛运用于软土地基的高速公路建设中,但其承载特性和设计方法并没有得到完善。鉴于此,采用非线性有限元软件对某高速公路软土地基路段进行建模计算,研究了5种桩距下路堤和地基的沉降变形特性。结果表明:桩距对路堤变形有着显著影响,路基水平位移、竖向位移均随桩距的增大而增大;不同桩距下桩顶、桩间土沉降变形规律一致,最大沉降均发生在路堤中轴线附近,越靠近路堤坡角沉降越小,且桩顶沉降小于桩间土沉降。CFG pile is widely used in highway construction on soft soil foundation by virtue of its convenient construction,high bearing capacity and low cost,but its bearing characteristics and design methods have not been well improved.In view of this,the nonlinear finite element software is used to model and calculate the soft soil foundation section of an expressway,and the settlement deformation characteristics of embankment and foundation under 5 kinds of pile spacing are studied.The results show that pile spacing has a significant effect on embankment deformation,and the horizontal displacement and vertical displacement of subgrade increase with the increase of pile spacing.Under different pile spacing,the settlement deformation of soil between piles is the same.The maximum settlement occurs near the central axis of the embankment,and the settlement of pile top is smaller than that of soil between piles.

关 键 词：CFG 桩距 位移 变形 

分 类 号：TU472[建筑科学—结构工程]