摘要
结合兰永一级公路软弱路基处治技术研究项目,为分析不同设计参数下CFG桩复合地基处治软土路基的沉降变化规律,利用非线性有限元软件ADINA建立三维模型,结合比奥固结理论,地基土体按多孔介质材料考虑,采用Mohr-coulomb理想弹塑性模型做固结分析,将填土视为荷载逐级施加,采用生死单元对CFG桩复合地基进行数值模拟。结果表明,相比提高垫层模量与桩身模量,选择较大桩长与合理的桩距、桩径对减小软土路基沉降更为明显,裙桩效应对于减小软土路基沉降起积极作用,软土路基经过CFG桩复合地基处理后满足一级公路工后沉降要求,加固效果明显。
Based on the soft roadbed treatment technology research project of Lanyong Highway,the settlement of the soft roadbed of the CFG pile composite foundation with different parameters was analyzed.The nonlinear finite element software ADINA was adopted to construct a three-dimensional model.Combined with the Biot consolidation theory,the consolidation analysis of foundation soil treated as porous medium material was performed by using the Mohr-Coulomb elastic-plastic model,and by adopting the birth and death element,the numerical simulation of the CFG composite foundation was run with earth filling considered as step-by-step loading.The results indicated that compared with the increase of pile and cushion moduli,the choice of a larger pile length and a reasonable pile distance and diameter was more significant in reducing the soft subgrade settlement,and the skirt piles effect had a positive role in reducing the soft subgrade settlement.The CFG pile composite foundation treatment could meet the technical requirements of highway post-construction settlement,and reinforcements were effective.
出处
《甘肃科学学报》
2015年第2期49-55,共7页
Journal of Gansu Sciences
基金
国家科技支撑计划资助项目(2011BAK12B07)
甘肃省自然科学基金资助项目(1208RJZA158)
甘肃省交通运输厅科研项目
关键词
软土路基
沉降
复合地基
数值模拟
Soft clay roadbed
Settlement
Composite foundation
Numerical simulation
