摘要
运用ABAQUS有限元软件建立桩网支承路基三维模型,分析桩间距、桩帽尺寸、软土层模量、下卧层模量和格栅模量等关键参数对桩网支承路基沉降、桩土应力、垫层上方应力、加筋网垫承担的应力、桩土荷载和格栅拉力等的影响。结果表明,桩土差异沉降受软土层模量影响最大,路基存在明显的应力集中即"土拱"效应,加筋网垫承担的竖向应力随下卧层模量、软土层模量和置换率的增大而减小,随格栅模量的增大而增大,两桩帽间格栅竖向变形近似呈悬索形状,上层格栅受到的拉力约为下层的0.4倍。
The three-dimensional model of geosynthetic reinforced and pile supported（GRPS） embankment was established by ABAQUS finite element software.The impact of the key parameters,such as the pile spacing,the size of pile cap,the modulus of soft soil,the modulus of sublayer and the geogrid,on the GRPS settlement,the pile-soil stress,the stress above the bedding,the stress of the reinforced bedding,the pile-soil loads and geosynthetic tension were simulated and analyzed.The results show that the modulus of the soft soil obviously affects the soil-pile differential settlement.＂Arch effect＂ appears clearly in subgrade body due to the stress concentration.The vertical stress of the reinforced bedding decreases with the increase of the modulus of the sublayer,the soft soil and the replacement ratio,while increases with the increase of the geogrid modulus.The geosynthetic vertical deformation of the geogrid between two pile caps is approximately to the suspended cable,the upper tension is 0.4 times more than that of the sublayer.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2010年第3期1-8,共8页
China Railway Science
基金
铁道部科技研究开发计划项目(2006G013)
关键词
路基
桩网支承路基
桩
格栅
力学性能
Subgrade
Geosynthetic reinforced and pile supported embankment
Pile
Grid
Mechanical property
