摘要
利用FLAC3D建立了桩承式路堤上部填土的数值计算模型,分析了路堤应力以及塑性区分布,提出了路堤拱效应分布图。在此基础上对Hewlett穹顶拱模型进行了改进,提出了刚性核弧拱力学计算模型,推导了应力折减比公式。将计算方法应用于广梧高速公路PHC管桩现场试验段,采用现有的5种方法与改进方法进行对比,结果表明改进的刚性核模型与实测吻合最好。
Numerical simulation model of piled embankment fill section is established by using FLAC313. Distribution character of the deformation, stress and plastic zone can be seen from the diagrams directly and arching effects distribution can be drew from the diagrams. Improvement of the Hewlett ＆ Randolph model is done based on the simulation and analysis. Rigid core arch model, which meet the simulation well, is put forward. Formula of stress reduction ratio is derived from the mechanical model. This method is used in Guangwu expressway to calculate the stress reduction ratio of the embankment supported by PHC piles comparing. The results show that calculation result of the rigid core arch method meet the value of the test in site best.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第13期73-77,共5页
Journal of Wuhan University of Technology
关键词
桩承式路堤
荷载传递机理
应力折减比
土拱效应
piled embankment
load transfer mechanism
stress reduction ratio
soil arching effect
