摘要
为研究桥梁台背软基处理方案和参数,以某高速公路跨河桥梁工程为例,采用数值模拟法对“CFG桩+泡沫混凝土”处理桥头软土路基的变形规律进行研究,并对该方案的沉降影响参数进行分析。结果表明:1)采用传统填土的CFG桩软土地基路基顶面的沉降值主要在距离桥台20 m范围内增大,采用“CFG桩+泡沫混凝土”方案,其沉降值主要增大区域在15 m范围内,且最大值减小了3.4 cm;2)CFG桩长、桩径的增大、桩间距的减小、泡沫混凝土的泡沫含量的减小,均有利于路基顶面的沉降控制;3)泡沫混凝土的密度在一定范围内能有效减小路基的荷载,但随着泡沫含量的增大,沉降值会逐渐增大。在实际工程中,应采用适当的参数,在保证路基沉降得到控制的同时,控制工程造价。本文成果可为桥头软土地基处理参数选择提供参考。
In order to study the treatment scheme and parameters of the soft foundation on the back of the bridge abutment,a highway cross-river bridge project is taken as an example,the numerical simulation method is used to research the deformation law of the soft subgrade treated by“CFG pile+foam concrete”,and the sedimentation influence parameters of the scheme are analyzed.The results show that:1)The sedimentation value of the top surface of the soft foundation of CFG pile with traditional filling is mainly increased within 20 m from the abutment,and the sedimentation value of the“CFG pile+foam concrete”scheme is mainly increased in the range of 15 m,and the maximum value is reduced by 3.4 cm.2)The increase of CFG pile length,pile diameter and pile spacing,and the decrease of foam content of foam concrete are all conducive to the sedimentation control of the top surface of the subgrade.3)The density of foam concrete can effectively reduce the load of the roadbed within a certain range,but with the increase of foam content,the sedimentation value will be gradually increased.In the actual project,appropriate parameters should be used to control the project cost while ensuring that the subgrade sedimentation is controlled.The results can provide references for the selection of treatment parameters for soft foundation at bridgehead.
作者
游桂芳
YOU Guifang(Shenzhen Dawson Engineering Design Co.,Ltd.,Shenzhen 518000,Guangdong,China)
出处
《工程建设》
2024年第11期54-58,共5页
Engineering Construction
关键词
CFG桩
桥头跳车
沉降
泡沫混凝土
CFG pile
bridgehead jumping
sedimentation
foam concrete
