摘要
土工格栅材料在长期使用过程中会受到外部环境和荷载的双重作用,导致其性能逐渐退化。特别是当土工格栅处于蠕变和老化的耦合作用下,其力学性能和耐久性可能会显著下降,从而影响地基的承载能力和工程结构的安全性。选用标准干砂作为加筋地基填料,并在考虑土工格栅老化和蠕变耦合效应的情况下进行了承载力试验,分析了土工格栅加筋砂土地基的承载力和地基应力分布的影响。试验结果表明:当加压荷载超过200 kPa后,地基的位移呈现出明显的差异,尤其是在不同老化与蠕变条件下,位移的变化更加显著;土工格栅的加筋效果并不会显著改变土压力的分布形态,而主要表现在对土压力大小的影响上。随着埋深z的增加,同一位置处的土压力呈现出不断增大的趋势;蠕变等级越高,土工格栅的老化效应越显著,导致加筋土体的应力分布趋于接近纯砂地基的土压力分布曲线。
Geogrid materials are subject to the dual effects of external environment and load during long-term use,leading to gradual degradation of their performance.Especially when geogrids are subjected to the coupling effects of creep and aging,their mechanical properties and durability may significantly decrease,thereby affecting the bearing capacity of the foundation and the safety of the engineering structure.In the paper,standard dry sand are selected as the filling material for reinforced foundation,and bearing capacity tests are conducted considering the coupling effects of geogrid aging and creep.The influence of the bearing capacity and foundation stress distribution of geogrid reinforced sandy soil foundation is analyzed.The experimental results show that when the compressive load exceeds 2o0 kPa,there is a significant difference in the displacement of the foundation,especially under different aging and creep conditions,where the change in displacement is more significant.The reinforcement effect of geogrid does not significantly change the distribution pattern of soil pressure,but mainly manifests in its influence on the magnitude of soil pressure.With the increase of burial depth z,the soil pressure at the same location shows a continuous increasing trend.The higher the creep level,the more significant the aging effect of geogrids,resulting in stress distribution of reinforced soil tending to approach the soil pressure distribution curve of pure sand foundation.
作者
袁慧
白晓红
YUAN Hui;BAI Xiao-hong(Taiyuan City Vocational and Technical College,Taiyuan O30027,China;Taiyuan University of Technology,Taiyuan O30024,China)
出处
《公路》
北大核心
2026年第2期17-24,共8页
Highway
基金
国家自然科学基金项目面上项目,项目编号51578359。
关键词
路基工程
加筋土
聚丙烯土工格栅
蠕变
老化
模型试验
地基承载力
subgrade engineering
reinforced soil
polypropylene geogrid
creep
aging
model testing
foundation bearing capacity
