摘要
针对西南山区高液限土地基特殊的工程性质,结合砂石垫层和土工格栅在地基加固中共同作用的特点,用土工格栅加筋垫层来加固高液限土地基。利用平面应变弹塑性有限元数值分析方法,对这种加固方式的作用机理进行了分析,结果表明加筋垫层能显著改善地基的受力和变形性状,增强地基的稳定性。同时,对加筋位置、加筋层数、筋材模量等参数对加固效果的影响及其规律进行了研究和总结。最后,通过比较离心模型试验与数值分析结果后发现两者相差不大,说明数值分析所采用的本构关系、计算模型和参数是合理的,数值模拟能较好的反映高液限土地基加固后的变形规律,数值分析的结果具有可信度。
According to the features of high liquid limit foundation in southwest mountainous area and the characteristics of geogrid reinforced cushion, geogrid reinforced cushion was used to reinforce high- liquid foundation.By using the elastic-plastic finite element analysis method, the mechanisms of the geogrid reinforced cushion were studied. Results show that geogrid reinforced cushion can greatly reduce loading and deformation and improve the high-liquid foundation stability. In addition, the effect of factors such as the location, layers, stiffness,etc. of geogrids on reinforcement and the regularity were discussed. The result of comparison of centrifugal model test result with numerical calculation results indicates that the error is negligible between them, which shows that （1） constitutive relationship, calculation model and calculation parameters are proved to be reasonable; simulation reflects deformation behavior of high- liquid foundation improvement effectively and （2） the numerical results ofnumerical analysis are reliable.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第5期23-28,34,共7页
Journal of Highway and Transportation Research and Development
基金
重庆市交通委员会科技项目(2006CQJTKJ026)
关键词
道路工程
高液限土地基
土工格栅垫层
有限元
加固效果
影响因素
离心模型试验
road engineering
high liquid limit foundation
geogrid cushion
finite element
reinforcement re-sult
influence factor
centrifugal model test
